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Engine bearings (crankshaft and conrods)
Topic Started: Tue Jun 24, 2014 9:54 pm (544 Views)
Cloudini5
Newbie
[ * ]
Hi guys

can someone explain to me how i can check what the original Bearing colours there was on the crankshaft and conrods ?
i cant seem to find any stamp or laser stamp of the colours on the crankshaft itself, or anything like that.
i want to order new bearings so i want to know what colour to go.

it is the first car engine im rebuilding anyway, (im an motorcycle mechanic)

the car is an 2.5-16V btw

thanks for helping :)
wesley

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Cloudini5
Newbie
[ * ]
anyone can explain me where i can find the bearing shell colours that used to be originally in the car engine ?
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Deleted User
Deleted User

There may not be any at all.

If you measure the crank and bores, the Dealer can put a set together for you.

If I recall correctly during this time, Mercedes did not "match" a bearing to each journal like the Japanese companies;
they held the crank journals to an exact measurement from one end to the other.

This proved to be an expensive choice, because if a machinist ground a journal .0002 too far, the crank was scrap.
Whereas a Honda for example, would have a slightly smaller bearing for the smaller journal, and save the crank.

Do you have a good digital micrometer?
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Cloudini5
Newbie
[ * ]
sorry to reply to this thread after so long time of period, i do not have an good digital micrometer but i can purchase one, i do have the old bearings but it doesnt show any color or what so ever.

also i cant remember the right sequence that all the bearings where.
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Cloudini5
Newbie
[ * ]
i have been looking with my nose

ive found green dots on the crankshaft (wich i think where blue in the past ?)
so that means 58mm blue color bearing caps for the crankshaft if someone can confirm this for me ?
and if i mount the new bearing shells i need to check with plastigage, what thickness should really be the oil film play ?
Old bearings on the crankshaft had the numbers 102-5101 and 102-5002 (if i match this numbers with the new ones the same is that safe aswell?)


and speaking of the conrods
i couldnt find any dots on them except for on the caps (watch the picture) can i thrust this color ? cause there is so much parts in the engine block that has red paint.
these had the bearings numbers : 102-4210 and 102-4211

let me know your thoughts.
tnx
Wesley

Posted Image
Posted Image

CONROD CAP BLOCKS
Posted Image
Edited by Cloudini5, Thu Nov 13, 2014 11:36 pm.
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Cloudini5
Newbie
[ * ]
this is what ive found on WIS but i dont actually get it yet, i do have 2 punch marks at every bearing seat on the crankcase as shown in this picture
but i dont really get this schematic,
how i read it is i have blue dots on my crank (i quess, its actually greenish) so it could be blue, color number 52, matching 2 punch marks everywhere wich is yellow? so i need yellow bearings wich are number 54 ?
or am i doing this really wrong ?
cause if i have yellow dots its still 54 with 2 punch marks wich is also yellow bearings ?

your thoughts thank you :)

Posted Image
Edited by Cloudini5, Sun Nov 16, 2014 4:22 pm.
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Cloudini5
Newbie
[ * ]
does anybody know the oil film play tollerance ?
how much space there needs to be (in a safe kind of mather) between the bearing and the crankshaft (for the crankshaft bearings and the conrod bearings)
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