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Old 01-13-2008, 01:54 PM
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Join Date: Jan 2008
Posts: 3
W123 102 engine thrust bearings

Hello, I have a question about replacement of the thrust bearings on the 102 engine crankshaft. Can this task be done with the engine in the car by removing the oil sump or would the crankshaft need to be removed. Thanks for any infomation.

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Old 01-13-2008, 02:05 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
There would be no reason to do such that wouldn't also require removing the crankshaft.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 01-13-2008, 02:33 PM
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Join Date: Jun 2007
Location: Just north of Indianapolis, Indiana
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* What is your reason for replacing the thrust bearings? Your problem could likely be something other than thrust bearings.
ASE Master Tech
Quality Enterprises
Mercedes Svc. & Restoration
Sheridan, IN
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Old 01-13-2008, 04:02 PM
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Location: beautiful Bucks Co, PA
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If you get the pan off, the thrust bearings should be removable. But, as already asked, why? Does the crankshaft exhibit excessive endplay?
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Old 01-15-2008, 03:04 PM
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Let the truth be know to all!!!

Ok I have to confess. I made a bad decision. I rebuilt this 2.3 ltr engine and installed all standard size bearing on the crankshaft and rod journals. I miked all the races to verify the use of new standard size bearing, but for some reason I believe it was that my parts supplier did not have standard size thrust bearings at the time I used first oversize on the thrust. Well now after the engine warms up, The engine starts to squeal. I checked everything; water pump replaced all belts checked and replaced, timing chain check and replaced, camshaft checked. My only conclusion is the thrust bearings are too tight. This is why I want to jack up the car drop the pan and replace the thrust bearing without removing the crankshaft. Ok I feel better now that I have told the truth. But I still have the squeal to solve.
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Old 01-15-2008, 08:30 PM
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Join Date: Dec 2006
Location: beautiful Bucks Co, PA
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You can check the endplay, using a dial indicator, without taking anything apart. If it's too little, drop the pan and change the thrust bearings.

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