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#1
10-13-2007, 10:40 PM
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Machinist help needed: warped water pump pulley
I'm working on a 1985 300D turbo. The water pump double pulley is warped.
The water pump was leaking so I replaced it and transfered the pulley to the new pump. I thougt it was the water pump wobbling but when I transfered the pulley to the new water pump the wobble was still there. The pulley warpage is not visible except when the vehicle is running at which point the pulley and clutch fan wobble is very obvious. I took the pulley back off and when i rotate it on the old pump in a vise I can see the pulley is slightly deformed (maybe 3/16" out of plane at the outer edge). I suspect the deformation is due to a slight bend at the pulley to water pump mounting surface. My best guess how this happened was that the pulley hung up on the damper pulley and the pulley bolts were snugged down, then it was put on right but the pulley remained deformed. I suspect it took down the water pump. The dealer wants over $150 for the pulley. Is my only other option a wrecking yard or could a machinist put it on a lathe or mill and gently work it back (brass mallet or bending)? I want to get it all back together this monday and don't have much time to drive around to wrecking yards. Thanks
__________________
1972 450SL 1982 300D Turbo 
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#2
10-13-2007, 11:06 PM
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just replace it
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#3
10-13-2007, 11:11 PM
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unless you have a friend with a lathe, just replace it.
I'm sure some of the kind people in he parts section would be happy to find you a replacement.
__________________
-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)
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#4
10-14-2007, 12:45 AM
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Previous advice should be taken - they are right.
Any good machinist could do it, but it would probably be cheaper to get one used on here, ebay or junkyard.
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#5
10-14-2007, 06:20 AM
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Quote:
__________________
83 SD 84 CD
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#6
10-14-2007, 06:26 AM
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Yes, get a used one. It shouldn't cost more than $10 in a junkyard.
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#7
10-14-2007, 09:06 AM
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I would not hesitate to attempt to straighten it myself. Youare going to replace it anyway. Just don't bend the edges of the pully groove, apply pressure toward the center of the pully from the edge where it cannot be deformed.
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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