[MBZ] Best way to test fan clutch
Subject says it all. I want to test the fan clutch on the 94 S420. I'll be Googling, but though I would solicit input here as well. Thanks, Dan Sent from my iPad ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
Engine off. Compare the amount of force required to turn the fan, cold engine vs really hot engine (need to read service manual to find the fan engagement temperature). Should be a higher force, should be noticeable increase in air flow noise with engine running. Not very scientific, but will help identify a totally dead clutch. -- Max Dillon Charleston SC '87 300TD '95 E300 On April 3, 2016 6:54:18 AM EDT, Dan Penoff via Mercedes wrote: >Subject says it all. I want to test the fan clutch on the 94 S420. > >I'll be Googling, but though I would solicit input here as well. > >Thanks, > >Dan > >Sent from my iPad > >___ >http://www.okiebenz.com > >To search list archives http://www.okiebenz.com/archive/ > >To Unsubscribe or change delivery options go to: >http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
Subject says it all. I want to test the fan clutch on the 94 S420. I'll be Googling, but though I would solicit input here as well. Thanks, Dan Sent from my iPad The test I saw was to roll up a newspaper and stick that into the back of the fan while the engine is idling. if the fan stops, you need a new clutch or you need to put the new oil in the clutch. Mine failed. After putting in the specified amount of 1 centistoke silicone oil, they passed. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
This is pretty much what I’m finding. I don’t know if the clutch is dead, but the youngster says the car is running hotter after a highway run and he gets onto surface streets. Says it will get up to about 100C and hang there for a bit. Ambients are fairly low today (it was 55F this morning when I went on my weekly grocery run) but should get up to 70F or thereabouts. I’ll catch him when he returns form a drive and see what it feels like. Thanks, Dan > On Apr 3, 2016, at 8:44 AM, Max Dillon via Mercedes > wrote: > > Engine off. Compare the amount of force required to turn the fan, cold > engine vs really hot engine (need to read service manual to find the fan > engagement temperature). Should be a higher force, should be noticeable > increase in air flow noise with engine running. > > Not very scientific, but will help identify a totally dead clutch. > -- > Max Dillon > Charleston SC > '87 300TD > '95 E300 > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
I have a container of the 1 C fluid. How many days did it take to fill it? Dan > On Apr 3, 2016, at 8:53 AM, Curly McLain via Mercedes > wrote: > > The test I saw was to roll up a newspaper and stick that into the back of the > fan while the engine is idling. if the fan stops, you need a new clutch or > you need to put the new oil in the clutch. > > Mine failed. After putting in the specified amount of 1 centistoke > silicone oil, they passed. > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
Visco clutch? Easy -- fan must be stiff when cold and the engine not running a while, and spin hard very briefly when started. Must pull hard when engine is hot enough to need extra cooling -- you should feel lots of air. When it should be engaged, shut the engine off while watching the fan (may need a helper). Fan MUST stop with less than two rotations, preferably less. If it spins at all, there isn't enough fluid in the clutch or the operating valve is stuck. I've always found that a bad clutch is covered with sticky black goo -- the goo is the silicone fluid and the black is road dirt. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
Thanks, Peter! Dan > On Apr 3, 2016, at 9:06 AM, Peter Frederick via Mercedes > wrote: > > Visco clutch? > > Easy -- fan must be stiff when cold and the engine not running a while, and > spin hard very briefly when started. Must pull hard when engine is hot > enough to need extra cooling -- you should feel lots of air. > > When it should be engaged, shut the engine off while watching the fan (may > need a helper). Fan MUST stop with less than two rotations, preferably less. > If it spins at all, there isn't enough fluid in the clutch or the operating > valve is stuck. > > I've always found that a bad clutch is covered with sticky black goo -- the > goo is the silicone fluid and the black is road dirt. > > Peter > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
you drill a hole for a #10 sheet metal screw (or a self tapping machine screw) in the unfinned center part, away from the bimetal spring. Pharmacy gave me a 10 cc syringe without a needle. Seems to me the dose was 16 cc. Shoot that in. Wipe clean. I put locktite on the screw head and put it on. 3/8" max length for the screw. You can use a 3/4", but check rotation first before you install the fan. You can cut off the screw after you make the threads with it. A #12 or 14 screw can be used if you can find one. Nothing smaller than #10. I had to remove the bimetal spring and the operating pin to allow air to vent. Otherwise I could not get the oil in fast enough. Wire brush or pressure wash the fan out of the car first to remove the dirt and old grease. Do the fill out of the car. Yes, the coasting test is another way to check. The dead fan clutch on my first SDL coasted for a long time after you shut down the engine. It was winter, so I did not change it right away. The fan came off and ruined the radiator. Lesson learned I have a container of the 1 C fluid. How many days did it take to fill it? Dan On Apr 3, 2016, at 8:53 AM, Curly McLain via Mercedes wrote: The test I saw was to roll up a newspaper and stick that into the back of the fan while the engine is idling. if the fan stops, you need a new clutch or you need to put the new oil in the clutch. Mine failed. After putting in the specified amount of 1 centistoke silicone oil, they passed. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
That reminds me, if you can move the blade tip fore / aft more than half an inch, the bearing is bad and a new clutch is required. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
How much does a new one cost? I never replaced a 123 fan clutch since my first one in 1986.. OTOH, the 108 and 109 sedans and 111 coupe all needed a new fan clutch. On Sun, Apr 3, 2016 at 10:39 AM, Max Dillon via Mercedes < mercedes@okiebenz.com> wrote: > That reminds me, if you can move the blade tip fore / aft more than half > an inch, the bearing is bad and a new clutch is required. > -- > Max Dillon > Charleston SC > '87 300TD > '95 E300 > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Best way to test fan clutch
Some of them are getting scarce and expensive. The W140 clutch can be found amor Behr (OEM) for around $100. Dan > On Apr 3, 2016, at 11:00 PM, Andrew Strasfogel via Mercedes > wrote: > > How much does a new one cost? I never replaced a 123 fan clutch since my > first one in 1986.. OTOH, the 108 and 109 sedans and 111 coupe all needed > a new fan clutch. > > On Sun, Apr 3, 2016 at 10:39 AM, Max Dillon via Mercedes < > mercedes@okiebenz.com> wrote: > >> That reminds me, if you can move the blade tip fore / aft more than half >> an inch, the bearing is bad and a new clutch is required. >> -- >> Max Dillon >> Charleston SC >> '87 300TD >> '95 E300 >> ___ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
