Re: [MBZ] 380SL chain tensioner
Peter -
There is a drilling jig that one must use to keep the holes in the proper
alignment when machining for the inserts on these engines. What makes the
job more difficult is the alloy with the silicon. It makes for a good
wearing surface but it is really tough on drills and taps as well. Timeserts
are also available in stainless, I'm not sure what MB calls for in this
application. An even more superior insert is the Keensert. We use these a
great deal on the parts we design for spacecraft, but the downside is more
machining costs, more space around the hole for the flange, and of course
cost.
Barry
What you describe {Threads not perpendicular to the milled
surface} would be a night mare to repair, requiring a threaded insert.
Our shop is a foundry and machine shop. We pour many aluminum
castings and machine them.
Many of the aerospace parts have the threads helicoiled.
Some are helicoiled because the are serviced in the field. The
Helicoil, having a stainless steel thread makes a superior joint
in all ways.
Many parts have repair procedures to salvage damaged threads.
___
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Re: [MBZ] 380SL chain tensioner
They do not, which is why you get chain slap on startup. The slapping chain clanks as well as eventually snapping the upper chain rail, and the broken off part usually (not always) falls into the crank sprocket. thus snapping the chain. This was a much worse problem with the original single row chain, but the later double row chain still wears excessively in normal use and can do the same thing. Worse yet, on the earlier aluminum block engines, the head bolts seize in the block, requiring a special jig to install steel inserts in order to re-install the heads. This is VERY expensive. Any M116 aluminum block engine producing chain slap on startup needs a new chain ASAP. I have also seen a recommendation to cut off the part of the upper guide that gets broken off by the chain, so that it will not snap off and fall into the chain case. Peter -OrigTinal Message- From: Hendrik Fay heni...@ozemail.com.au Sent: Sep 2, 2009 8:45 AM To: Mercedes Discussion List mercedes@okiebenz.com Subject: Re: [MBZ] 380SL chain tensioner So how do they maintain pressure, when there is no oil pressure? Hendrik Mathieu J. Cama wrote: ---Original Message--- From: Hendrik Fay heni...@ozemail.com.au Subject: Re: [MBZ] 380SL chain tensioner Sent: 02 Sep '09 12:24 If the tensioner is the same as the inline 4 and 6 petrol motors, then there is a spring and ratchet mechanism in there which would not be affected by oil pressure. Timing chain rattle is a different sound to the ticking produced by lifters and such. Old oil will make the ticking louder and longer. Hendrik These are oil pressure fed tensioners. No spring or ratchet. Hence why folks get jumpy when they begin making noise. Chain, rails, and tensioner is a bargain compared to a full valve job and possibly more when the chain snaps. This is not to say the lifters are not gummed up and making noise as well. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Peter Frederick wrote: They do not, which is why you get chain slap on startup. Sounds like a startup oiling system would be useful for that engine. Either a pressure tank on a solenoid valve, or an electric oil pump, get some pressure in the oil galley before the engine starts turning. Mitch. ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Worse yet, on the earlier aluminum block engines, the head bolts seize in the block, requiring a special jig to install steel inserts in order to re-install the heads. This is VERY expensive. Why not Helicoil them? Pete Windsor -- next part -- An HTML attachment was scrubbed... URL: http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20090902/fcab855b/attachment.html ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
The bolts go into the block at an angle. If you don't get them exactly right, the bolts won't torque correctly and the head gasket blows. Problem was solved by using TimeSert type steel inserts at the factory, but there is no way to tell if you have them on early production engines unless you pull the heads... Helicoils don't work very well when the whole thread comes out with the bolt, which is the usual case. To get the necessary strength, the hole must be drilled, threaded, and the insert screwed in and locked. The jig is necessary to get the correct angle on the bolts, they don't run square with the deck. Last time my buddy had this done, it cost $1500. MUCH cheaper to replace the chain. The tensioner system works just fine, by the way. It's only when the chain is excessively worn that it slaps. There IS a spring in the tensioner to apply some pressure, and the oil usually stays put inside it with minimal leakdown. However, when the chain is so long that the tensioner is almost fully extended, any leakdown will let the chain flap around until the tensioner re-fills. Peter -Original Message- From: pm7...@comcast.net Sent: Sep 2, 2009 10:36 AM To: Mercedes Discussion List mercedes@okiebenz.com Subject: Re: [MBZ] 380SL chain tensioner Worse yet, on the earlier aluminum block engines, the head bolts seize in the block, requiring a special jig to install steel inserts in order to re-install the heads. This is VERY expensive. Why not Helicoil them? Pete Windsor -- next part -- An HTML attachment was scrubbed... URL: http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20090902/fcab855b/attachment.html ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
What you describe {Threads not perpendicular to the milled surface} would be a
night mare to repair, requiring a threaded insert.
Our shop is a foundry and machine shop. We pour many aluminum castings and
machine them.
Many of the aerospace parts have the threads helicoiled.
Some are helicoiled because the are serviced in the field. The Helicoil, having
a stainless steel thread makes a superior joint in all ways.
Many parts have repair procedures to salvage damaged threads.
--
Peter Arnold
Windsor, CT
- Original Message -
From: Peter Frederick psf...@earthlink.net
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Wednesday, September 2, 2009 10:57:37 AM GMT -05:00 US/Canada Eastern
Subject: Re: [MBZ] 380SL chain tensioner
The bolts go into the block at an angle. If you don't get them exactly right,
the bolts won't torque correctly and the head gasket blows. Problem was solved
by using TimeSert type steel inserts at the factory, but there is no way to
tell if you have them on early production engines unless you pull the heads...
Helicoils don't work very well when the whole thread comes out with the bolt,
which is the usual case. To get the necessary strength, the hole must be
drilled, threaded, and the insert screwed in and locked. The jig is necessary
to get the correct angle on the bolts, they don't run square with the deck.
Last time my buddy had this done, it cost $1500.
MUCH cheaper to replace the chain. The tensioner system works just fine, by the
way. It's only when the chain is excessively worn that it slaps. There IS a
spring in the tensioner to apply some pressure, and the oil usually stays put
inside it with minimal leakdown. However, when the chain is so long that the
tensioner is almost fully extended, any leakdown will let the chain flap around
until the tensioner re-fills.
Peter
-Original Message-
From: pm7...@comcast.net
Sent: Sep 2, 2009 10:36 AM
To: Mercedes Discussion List mercedes@okiebenz.com
Subject: Re: [MBZ] 380SL chain tensioner
Worse yet, on the earlier aluminum block engines, the head bolts seize in the
block, requiring a special jig to install steel inserts in order to re-install
the heads. This is VERY expensive.
Why not Helicoil them?
Pete
Windsor
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Re: [MBZ] 380SL chain tensioner
Should not take more than about 10 minutes to change, just take 2 bolts off, pull it out, put new one in, install bolts. Loren Faeth wrote: How long/difficult of a job is it to change the tensioner on the 3.8 gasser? How much stuff has to be taken off to get to the tensioner? Anyone able to get me the pdf for that job? (1985 380SL) Daughter's Sl makes quite a clatter at startup at the front of the right bank. It only lasts a second. Sounds like a tensioner leaking down to me. Anybody got a better idea? ~130k on the car. Chain is probably a little loose, but shouldn't need changing yet. Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com -- next part -- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.72/2337 - Release Date: 08/31/09 05:50:00 ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Thanks! I was hoping for something easy! At 07:43 AM 9/1/2009, you wrote: Should not take more than about 10 minutes to change, just take 2 bolts off, pull it out, put new one in, install bolts. Loren Faeth wrote: How long/difficult of a job is it to change the tensioner on the 3.8 gasser? How much stuff has to be taken off to get to the tensioner? Anyone able to get me the pdf for that job? (1985 380SL) Daughter's Sl makes quite a clatter at startup at the front of the right bank. It only lasts a second. Sounds like a tensioner leaking down to me. Anybody got a better idea? ~130k on the car. Chain is probably a little loose, but shouldn't need changing yet. Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com -- next part -- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.72/2337 - Release Date: 08/31/09 05:50:00 ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
On Sep 1, 2009, at 12:29 AM, Peter Frederick wrote: Roll in a new chain and replace the upper right tensioner rail NOW before the rail gets broken by the chain slap and the chunk falls down and snaps the chain, unless you WANT to do a valve job. Check stretch every 30,000 miles and replace at 4 degrees. Peter This is sound advice! Replace all the upper rails, not just the one, they are inexpensive and become brittle with heat cycling. Use a genuine MB tensioner only! Chain is not hard to do, either. Inspect the cam sprockets for wear while you are in there. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Hi Loren - Changing the TC tensioner is easy as Kaleb suggested but that doesn't address a possibly worn chain, guide/rail that may be badly worn. They should be inspected IMO. Good luck - LarryT 91 300D OilAnalysis Time? Looking for Weber Parts or Porsche Posters? www.youroil.net -- From: Loren Faeth lfa...@leadingchange.com Sent: Tuesday, September 01, 2009 9:10 AM To: Mercedes Discussion List mercedes@okiebenz.com Subject: Re: [MBZ] 380SL chain tensioner Thanks! I was hoping for something easy! At 07:43 AM 9/1/2009, you wrote: Should not take more than about 10 minutes to change, just take 2 bolts off, pull it out, put new one in, install bolts. Loren Faeth wrote: How long/difficult of a job is it to change the tensioner on the 3.8 gasser? How much stuff has to be taken off to get to the tensioner? Anyone able to get me the pdf for that job? (1985 380SL) Daughter's Sl makes quite a clatter at startup at the front of the right bank. It only lasts a second. Sounds like a tensioner leaking down to me. Anybody got a better idea? ~130k on the car. Chain is probably a little loose, but shouldn't need changing yet. Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com -- next part -- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.72/2337 - Release Date: 08/31/09 05:50:00 ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Now if it was this easy on a 119 motor, I would be all set. Mathieu J. Cama wrote: On Sep 1, 2009, at 12:29 AM, Peter Frederick wrote: Roll in a new chain and replace the upper right tensioner rail NOW before the rail gets broken by the chain slap and the chunk falls down and snaps the chain, unless you WANT to do a valve job. Check stretch every 30,000 miles and replace at 4 degrees. Peter This is sound advice! Replace all the upper rails, not just the one, they are inexpensive and become brittle with heat cycling. Use a genuine MB tensioner only! Chain is not hard to do, either. Inspect the cam sprockets for wear while you are in there. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.72/2337 - Release Date: 08/31/09 05:50:00 -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com -- next part -- An HTML attachment was scrubbed... URL: http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20090901/c3b21ac6/attachment.html -- next part -- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.74/2339 - Release Date: 09/01/09 06:52:00 ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
I did not mention, when I mess with the chain or tensioner on those, I always just roll in a new chain and top rails along with the tensioner. LarryT wrote: Hi Loren - Changing the TC tensioner is easy as Kaleb suggested but that doesn't address a possibly worn chain, guide/rail that may be badly worn. They should be inspected IMO. Good luck - LarryT 91 300D OilAnalysis Time? Looking for Weber Parts or Porsche Posters? www.youroil.net -- From: Loren Faeth lfa...@leadingchange.com Sent: Tuesday, September 01, 2009 9:10 AM To: Mercedes Discussion List mercedes@okiebenz.com Subject: Re: [MBZ] 380SL chain tensioner Thanks! I was hoping for something easy! At 07:43 AM 9/1/2009, you wrote: Should not take more than about 10 minutes to change, just take 2 bolts off, pull it out, put new one in, install bolts. Loren Faeth wrote: How long/difficult of a job is it to change the tensioner on the 3.8 gasser? How much stuff has to be taken off to get to the tensioner? Anyone able to get me the pdf for that job? (1985 380SL) Daughter's Sl makes quite a clatter at startup at the front of the right bank. It only lasts a second. Sounds like a tensioner leaking down to me. Anybody got a better idea? ~130k on the car. Chain is probably a little loose, but shouldn't need changing yet. Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com -- next part -- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.72/2337 - Release Date: 08/31/09 05:50:00 ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.72/2337 - Release Date: 08/31/09 05:50:00 -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com -- next part -- An HTML attachment was scrubbed... URL: http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20090901/37eed390/attachment.html -- next part -- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.74/2339 - Release Date: 09/01/09 06:52:00 ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
On Sep 1, 2009, at 5:52 PM, Kaleb C. Striplin wrote: Now if it was this easy on a 119 motor, I would be all set. 4 cams... double the pleasure. Timing advance units... even more fun. Baum sells some really nice tools that should make your life considerably easier on that job. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
On Tue, 1 Sep 2009 18:30:34 -0400 Mathieu J. Cama c...@oldworldauto.com wrote: On Sep 1, 2009, at 5:52 PM, Kaleb C. Striplin wrote: Now if it was this easy on a 119 motor, I would be all set. 4 cams... double the pleasure. Timing advance units... even more fun. Baum sells some really nice tools that should make your life considerably easier on that job. Do they sell any tools to make getting the power steering out any easier? Where do they sell them? Craig ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
From memory those small V8's had some problems with camshaft wear, which resulted in a ticking noise. Do these have solid or hydraulic lifters? Hydraulic lifters have been known to tick until the oil pressure builds up in them. I don't know that you can measure timing chain stretch in the petrol models but I could be wrong. However guide rail failure is a problem. Hendrik Peter Frederick wrote: Roll in a new chain and replace the upper right tensioner rail NOW before the rail gets broken by the chain slap and the chunk falls down and snaps the chain, unless you WANT to do a valve job. Check stretch every 30,000 miles and replace at 4 degrees. Peter ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
If the tensioner is the same as the inline 4 and 6 petrol motors, then there is a spring and ratchet mechanism in there which would not be affected by oil pressure. Timing chain rattle is a different sound to the ticking produced by lifters and such. Old oil will make the ticking louder and longer. Hendrik Kaleb C. Striplin wrote: Should not take more than about 10 minutes to change, just take 2 bolts off, pull it out, put new one in, install bolts. Loren Faeth wrote: How long/difficult of a job is it to change the tensioner on the 3.8 gasser? How much stuff has to be taken off to get to the tensioner? Anyone able to get me the pdf for that job? (1985 380SL) Daughter's Sl makes quite a clatter at startup at the front of the right bank. It only lasts a second. Sounds like a tensioner leaking down to me. Anybody got a better idea? ~130k on the car. Chain is probably a little loose, but shouldn't need changing yet. Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
---Original Message--- From: Hendrik Fay heni...@ozemail.com.au Subject: Re: [MBZ] 380SL chain tensioner Sent: 02 Sep '09 12:24 If the tensioner is the same as the inline 4 and 6 petrol motors, then there is a spring and ratchet mechanism in there which would not be affected by oil pressure. Timing chain rattle is a different sound to the ticking produced by lifters and such. Old oil will make the ticking louder and longer. Hendrik These are oil pressure fed tensioners. No spring or ratchet. Hence why folks get jumpy when they begin making noise. Chain, rails, and tensioner is a bargain compared to a full valve job and possibly more when the chain snaps. This is not to say the lifters are not gummed up and making noise as well. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
I just hired a dude whose last name is Mathieustrange... Bob R On Tue, Sep 1, 2009 at 7:59 PM, Mathieu J. Cama c...@oldworldauto.comwrote: ---Original Message--- From: Hendrik Fay heni...@ozemail.com.au Subject: Re: [MBZ] 380SL chain tensioner Sent: 02 Sep '09 12:24 If the tensioner is the same as the inline 4 and 6 petrol motors, then there is a spring and ratchet mechanism in there which would not be affected by oil pressure. Timing chain rattle is a different sound to the ticking produced by lifters and such. Old oil will make the ticking louder and longer. Hendrik These are oil pressure fed tensioners. No spring or ratchet. Hence why folks get jumpy when they begin making noise. Chain, rails, and tensioner is a bargain compared to a full valve job and possibly more when the chain snaps. This is not to say the lifters are not gummed up and making noise as well. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- next part -- An HTML attachment was scrubbed... URL: http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20090901/24d2c726/attachment.html ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
So how do they maintain pressure, when there is no oil pressure? Hendrik Mathieu J. Cama wrote: ---Original Message--- From: Hendrik Fay heni...@ozemail.com.au Subject: Re: [MBZ] 380SL chain tensioner Sent: 02 Sep '09 12:24 If the tensioner is the same as the inline 4 and 6 petrol motors, then there is a spring and ratchet mechanism in there which would not be affected by oil pressure. Timing chain rattle is a different sound to the ticking produced by lifters and such. Old oil will make the ticking louder and longer. Hendrik These are oil pressure fed tensioners. No spring or ratchet. Hence why folks get jumpy when they begin making noise. Chain, rails, and tensioner is a bargain compared to a full valve job and possibly more when the chain snaps. This is not to say the lifters are not gummed up and making noise as well. Mathieu ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
How long/difficult of a job is it to change the tensioner on the 3.8 Never done it, but I suspect it's not hard to get to. -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Loren, you are flirting with a total KABOM.My 86 560Sl had 145K on it with no chain slap, just a leaking valve cover gasket. Pulled the cover and found the nylon chain guides broken into 4 pieces. Oilers, tensioner. chain guides new chain and gasket was 1200 bucks at my Indie. Best money I ever spent! Like this comment or not, I have lost faith in the MB V8 engines. John On Mon, Aug 31, 2009 at 8:43 PM, Loren Faethlfa...@leadingchange.com wrote: How long/difficult of a job is it to change the tensioner on the 3.8 gasser? How much stuff has to be taken off to get to the tensioner? Anyone able to get me the pdf for that job? (1985 380SL) Daughter's Sl makes quite a clatter at startup at the front of the right bank. It only lasts a second. Sounds like a tensioner leaking down to me. Anybody got a better idea? ~130k on the car. Chain is probably a little loose, but shouldn't need changing yet. Loren Faeth ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 380SL chain tensioner
Roll in a new chain and replace the upper right tensioner rail NOW before the rail gets broken by the chain slap and the chunk falls down and snaps the chain, unless you WANT to do a valve job. Check stretch every 30,000 miles and replace at 4 degrees. Peter ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
