I need to know if I need oversized main and rod bearings. I cannot find this information anywhere!!! I just spend $80 on an official mercedes benz service manual and it wasn't in there. Can anyone help me out? What is the standard journal diameter and when does it require oversizing? I have already measured my crank...i just need data to compair it too. Thankyou!

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George Carstens

Standard size main crank journal is 57.950 to 57.965mm.
Std size rod journal is 47.935 to 47.955mm.

There are 4 repair sizes for either, mains or rods in .025mm increments.

.06mm clearance on the mains would be max.
.04mm clearance on the rods would be max.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thankyou Pat, I appreciate it!

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George Carstens

I have figured out that I can stay standard on both my main and rod bearings...can I just assume that my thrust bearings are standard too? If not, can you give me those clearances too?

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George Carstens

The standard size of the thrust bearings is 2.15mm & the clearance(endplay) is 0.10 to 0.20 mm.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I don't suppose you could tell me the stock thickness of the head gasket...could you?

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George Carstens