Fan viscous drive clutch engagement spring change - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 10-20-2009, 08:37 AM Thread Starter
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Fan viscous drive clutch engagement spring change

Has anyone ever actually changed one of these and can advise just how easy or difficult it is to do? It's a tight squeeze getting in there; fan on or fan off the car the best way to do it?

Thanks in advance.
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post #2 of 5 (permalink) Old 10-20-2009, 08:46 PM
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If you are asking how to change the viscous fan clutch on a 103 engine, I can help. I don't know about a spring. The first thing on a viscous fan clutch is to remove the fan shroud.

Then make a tool to freeze the fan pulley. Mine is a bent piece of 1/8" rod (3 mm) with a 3/4" (19 mm) 'L' on one end and a loop bent into the other to hang on to. The whole thing needs to be about 8" (200 mm) long.

You feed the 'L' shape into a special groove on the pulley bearing flange and into a hole in the rear of the pulley hub. This allows you to loosen and retighten the fan bolts and the viscous clutch bolts.

A good fan clutch freewheels when cold and tightens when hot. It releases at 3500 rpm. When it is working correctly, you only hear it roar when you rev the engine on a really hot day. Otherwise, it is silent.

Good luck,
Peter
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post #3 of 5 (permalink) Old 10-21-2009, 04:12 AM Thread Starter
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It's the heat sensitive spring which engages and disengages the clutch that needs to be replaced. I accidentally bent it and want to put on a new one; right now it's always engaged, so no danger of overheating but it doesn't freewheel over 3500 or at low temps, so it is a bit noisier than I prefer.

Thanks for the tool tip though.
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post #4 of 5 (permalink) Old 10-21-2009, 07:06 PM
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AFAIK there's no replacing just the bimetal strip at the front of the fan clutch. You replace the fan clutch as an assemby only.
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post #5 of 5 (permalink) Old 10-22-2009, 03:54 AM Thread Starter
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It has its own part number on it, so I'm thinking there must be a way ...
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