Re: [MBZ] Vacuum leaks 1980 300D
Doug, Get a mitivac as others suggested. The chain car parts places have them. Don't pay extra for a fancy metal one. Get some vacuum hose and golf tees for blocking the rubber vacuum lines. I attached the 123 vacuum diagrams, which are in section 80 of the service manual. Start under the hood first to determine which system(s) (e.g. doors, ACC, etc.) are leaking then troubleshoot them one at a time. For the locking system, the main junction under the passenger's floor mat is the place to start and you can check 80% of it from right there. When you find a leaky circuit, disconnect it and stop the line to that circuit with a tee so you can check the rest of the system. Just takes a methodical approach and some patience. After you find the leaks, fixing them is another matter. Scott -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Douglas Sherman Sent: Friday, November 09, 2007 22:46 To: Mercedes List Subject: [MBZ] Vacuum leaks 1980 300D Alright I have the climate control working now. Though I have a need to repair the vacuum leaks that are present in the car I know that both the door system and the climate leaks. What do all you do instead of a smoke machine to find these leaks? I find it difficult to just Try different spots. Any help on this matter would be nice.:) TIA Douglas ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- next part -- A non-text attachment was scrubbed... Name: 80-900.pdf Type: application/pdf Size: 235816 bytes Desc: not available Url : http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20071110/7d23567d/attachment.pdf ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D
What the others have said, Douglas. To elaborate, if you remove the glove box liner and possibly the lower panel under the dash you'll be able to access the manifold thru which all the vacuum circuits are routed. Testing individual circuits at the manifold will tell you whether there's leakage in a given vacuum line or its associated element. When I went thru the '80 I was able to resecure some old loose rubber connectors using small zip ties. IIRC, I had to remove a few bits from the center console to gain access and in at least a couple of cases that access was quite tight; having relatively small hands was a distinct benefit. The only circuit I didn't repair was the leaking element that controls fresh air flow thru the center vents. Have to confess I rube goldberged that one as that element is probably the most difficult to access for replacement. What I did was to plug the vacuum line at the manifold and abandon that element. I removed the round center vents thru which I could, barely, insert my hands and cut a wooden wedge to hold the fresh air flap open. Reinstalled the vents which now allow for manual control of fresh air flow. Guess I lied in the ad I just placed on c/l when I stated that *everything* works as intended. ;) -joe ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D/tools needed
In a message dated 11/9/2007 8:53:33 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: Alright I have the climate control working now. Though I have a need to repair the vacuum leaks that are present in the car I know that both the door system and the climate leaks. What do all you do instead of a smoke machine to find these leaks? I find it difficult to just Try different spots. Douglas, Two known best spots to check are the master valve in the driver's door, which will leak a LOT of vacuum, Only replace with Bosch, the substitute will leak again in months to a couple years at most. The other place is at the Y in the trunk, near the fuel tank cover. Easy to get to and the fuel tank cover lock is a frequent failure point, I think due to the higher heat exposure in that location. You can also check the trunk lock actuator from the same point and it also fails more quickly due to the heat exposure. Of course, the myriad of tees and check valve fittings right near the brake booster merit close visual inspection. If you don't have a vacuum tester by now, they are again on sale at Harbor Freight, a metal bodied one for $18.99, made by General. Punch up part # 92474. Something else on sale that everyone should have is the fuel injection pressure tester at only $9.99! part # 92699. If you only use it to verify your oil pressure sender accuracy (it comes with a lot of adapters and a 100PSI gauge), you will have paid for it nicely. Regards, Jim Friesen Phoenix AZ 79 300SD, 264 K miles 98 ML 320, 152 K miles ** See what's new at http://www.aol.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D/tools needed
You must buy a Vacuum Tester to have any hope of repairing the vacuum system. They are from $20 to $100 and up - some plastic, some metal - some with accessories some without. They are available at Walmart, Sears, K Mart, etc. Many places sell them -- even eBay. Then it's a matter of using logic to decide where to start. LR door doesn;t lock? remove the door panel and pull the hoses from the element. Use the vacuum Tester to see if it locks or unlocks the door - one hose locks and 1 hose unlocks. You probably have a bad element somewhere - the rubber diaphragms are damaged moe often than the rubber or plastic hoses. The element diaphrams get torn and leak. Good luck- Larry T (67 MGB, 74 911, 78 240D, 91 300D) www.youroil.net for Oil Analysis and Weber Parts Test Results http://members.rennlist.com/oil PORSCHE POSTERS! youroil.net Weber Carb Info http://members.rennlist.com/webercarbs . - Original Message - From: [EMAIL PROTECTED] To: mercedes@okiebenz.com Sent: Saturday, November 10, 2007 3:23 PM Subject: Re: [MBZ] Vacuum leaks 1980 300D/tools needed In a message dated 11/9/2007 8:53:33 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: Alright I have the climate control working now. Though I have a need to repair the vacuum leaks that are present in the car I know that both the door system and the climate leaks. What do all you do instead of a smoke machine to find these leaks? I find it difficult to just Try different spots. Douglas, Two known best spots to check are the master valve in the driver's door, which will leak a LOT of vacuum, Only replace with Bosch, the substitute will leak again in months to a couple years at most. The other place is at the Y in the trunk, near the fuel tank cover. Easy to get to and the fuel tank cover lock is a frequent failure point, I think due to the higher heat exposure in that location. You can also check the trunk lock actuator from the same point and it also fails more quickly due to the heat exposure. Of course, the myriad of tees and check valve fittings right near the brake booster merit close visual inspection. If you don't have a vacuum tester by now, they are again on sale at Harbor Freight, a metal bodied one for $18.99, made by General. Punch up part # 92474. Something else on sale that everyone should have is the fuel injection pressure tester at only $9.99! part # 92699. If you only use it to verify your oil pressure sender accuracy (it comes with a lot of adapters and a 100PSI gauge), you will have paid for it nicely. Regards, Jim Friesen Phoenix AZ 79 300SD, 264 K miles 98 ML 320, 152 K miles ** See what's new at http://www.aol.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] 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 Free Edition. Version: 7.5.503 / Virus Database: 269.15.28/1122 - Release Date: 11/10/2007 10:41 AM ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Vacuum leaks 1980 300D
Thanks all I have a mity vac and will print the pdf that Scott sent :) and work on it this week I really do not want to pay for a smoke machine. Though the wife gave the go ahead! Thanks again all Douglas ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D
I must have missed the PDF somewhere among the threads. :) __ From: Douglas Sherman [EMAIL PROTECTED] Reply-To: Mercedes Discussion List mercedes@okiebenz.com To: Mercedes List mercedes@okiebenz.com Subject: [MBZ] Vacuum leaks 1980 300D Date: Sat, 10 Nov 2007 20:33:27 -0800 (PST) Thanks all I have a mity vac and will print the pdf that Scott sent :) and work on it this week I really do not want to pay for a smoke machine. Though the wife gave the go ahead! Thanks again all Douglas ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Vacuum leaks 1980 300D
Alright I have the climate control working now. Though I have a need to repair the vacuum leaks that are present in the car I know that both the door system and the climate leaks. What do all you do instead of a smoke machine to find these leaks? I find it difficult to just Try different spots. Any help on this matter would be nice.:) TIA Douglas ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D
On Fri, 9 Nov 2007 19:46:14 -0800 (PST) Douglas Sherman [EMAIL PROTECTED] wrote: Alright I have the climate control working now. Though I have a need to repair the vacuum leaks that are present in the car I know that both the door system and the climate leaks. What do all you do instead of a smoke machine to find these leaks? I find it difficult to just Try different spots. Any help on this matter would be nice.:) Sure. Many of us have been there. With the right tool it is straightforward. That right tool is a Mity-Vac, a hand-held device that has a hand-operated vacuum pump and a vacuum gauge. See http://www.mityvac.com/ One connects the Mity-Vac up to various parts of the system, operates the pump, and observes whether the vacuum stays up or leaks off. By systematically going through the system, one can find the offending part(s) and determine how to fix/replace them. Craig ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D
Correct. You also need the sections of the manual that lay out the vac schematics, so you can see how the whole thing is organized, and so you can know what to check and what it means. You need to work on the door locks through the fittings at the firewall and those under the front pass side carpet. I just did this exercise this week. --R Craig McCluskey wrote: On Fri, 9 Nov 2007 19:46:14 -0800 (PST) Douglas Sherman [EMAIL PROTECTED] wrote: Alright I have the climate control working now. Though I have a need to repair the vacuum leaks that are present in the car I know that both the door system and the climate leaks. What do all you do instead of a smoke machine to find these leaks? I find it difficult to just Try different spots. Any help on this matter would be nice.:) Sure. Many of us have been there. With the right tool it is straightforward. That right tool is a Mity-Vac, a hand-held device that has a hand-operated vacuum pump and a vacuum gauge. See http://www.mityvac.com/ One connects the Mity-Vac up to various parts of the system, operates the pump, and observes whether the vacuum stays up or leaks off. By systematically going through the system, one can find the offending part(s) and determine how to fix/replace them. Craig ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Vacuum leaks 1980 300D
What do all you do instead of a smoke machine to find these leaks? Mityvac. Divide and conquer. -- Jim ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
