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  #1  
Old 10-06-2010, 10:29 PM
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Fan Clutch 87 300SDL, need help quick, away from home

I'm trying to figure how to replace the fan clutch on a 87 300SDL 6 cylinder engine. I got fan off but nothing else.

Instructions with new clutch said the clutch screws off the shaft from water pump but clutch just slips on that shaft. I tried tapping a screw driver between pulley nose and the clutch but its too tight to move.


Any help would be appreciated.

P E H

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  #2  
Old 10-06-2010, 10:33 PM
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I think HF has a pulley holding tool that's pretty snazzy. you will also need an 8mm allen wrench. or you can use a large strap wrench to hold the pulley still. how much room is there on the SDL? on a 124 you can barely fit the allen wrench in there by the radiator. MUCH easier to remove the radiator first!!!
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Old 10-06-2010, 10:34 PM
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If you look closely, there is a hole in the body of the clutch through which you can insert a long narrow screwdriver, a coat hanger. or something similar.

This should keep the fan from rotating.

Phil
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Old 10-06-2010, 10:41 PM
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Quote:
Originally Posted by P.E.Haiges View Post
I'm trying to figure how to replace the fan clutch on a 87 300SDL 6 cylinder engine. I got fan off but nothing else.

Instructions with new clutch said the clutch screws off the shaft from water pump but clutch just slips on that shaft. I tried tapping a screw driver between pulley nose and the clutch but its too tight to move.


Any help would be appreciated.

P E H
Minimum method you can release the tensioner and remove the serpentine belt, then use the serpentine belt and a pair of visegrips to form a strap wrench to hold the water pump pulley. The clutch is held in place with an 8 mm allen bolt in the center of the clutch.

If there is a Harbor Freight within driving distance you can but a pulley spinning/holding tool for $8 that will let you hold the pulley and remove the bolt. You should be able to drive the vehicle without the fan without too much of a problem!
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  #5  
Old 10-06-2010, 10:48 PM
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i'm going to try the things mentioned. Thanks. BBL, probably tomorrow, its dark here now.

P E H.
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  #6  
Old 10-07-2010, 01:26 AM
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Why are you fixing the fan clutch away from home? Did it break suddenly? You can turn on the aux fan by shorting the 2 prong pair of the 3-prong thermo-switch on top of engine block. That would get you home.
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  #7  
Old 10-07-2010, 05:54 AM
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the serpentine belt should hold the waterpump pulley from turning so you can get the 8 mm bolt out. changed my waterpump a couple of months ago and that is how i did it.

Mike
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  #8  
Old 10-07-2010, 06:27 AM
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Boblo,

Home is 2400 miles away. Fan clutch may have been broken for a long time, but on a 5 mile 6% grade hill in AZ at 104*F, engine over heated.
aux fan was on but not enough to cool in hot weather on grade.

P E H
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  #9  
Old 10-08-2010, 02:17 AM
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Thanks guys for the quick help on the fan clutch replacement. The 8mm allen wrench worked fine, but next time I'm going to remove the radiator to make it easier to R&R the fan..


P E H

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