m20 b25 engine bearing kolbenschmidt std

[markus_74]

hello,

need info on engine bearing, after I see the ks catalog, I found 2 different part number for m20 b25 engine bearing.
both has same size.
HL
87491601 and 87369600

any advice?

http://download.ms-motorservice.com/xim ... mw_web.pdf

regards
markus

[Brianmoooore]

Something in the deep recesses of my mind thinks it's probably something to do with the oil channel in the middle of the bearings. There's a version where the groove is in both shells, and a version where one shell is grooved, and the other plain.
May be total rubbish, of course.

[markus_74]

find interesting in the forum and website groove in the both shells is old version and only one groove is new design after march 1988.

mine is 1989, I think I can use both of them without any issue?

[DanThe]

Check the locating tabs, some have one, some have two

[reggid]

double vs single tangs....???

http://www.iemotorsport.com/bmw/E30-eng ... nbrng.html

http://www.r3vlimited.com/board/showthread.php?t=256117

[DanThe]

double vs single tangs....???

http://www.iemotorsport.com/bmw/E30-eng ... nbrng.html

http://www.r3vlimited.com/board/showthread.php?t=256117

Yep, thats the decider

[markus_74]

thank you, for all the info will check it on sunday

[HairyScreech]

Something in the deep recesses of my mind thinks it's probably something to do with the oil channel in the middle of the bearings. There's a version where the groove is in both shells, and a version where one shell is grooved, and the other plain.
May be total rubbish, of course.

Bingo. Can't remember what the specific applications are but yes.
This was a running change from 360 to 180 oiling iirc.

There is also as above single and double tang bearings, single tang bearings should fit all blocks though.

[DanThe]

single tang bearings should fit all blocks though.

The tangs are different sizes too

[HairyScreech]

They are? been a while since I looked but the double tang block I have certainly would happily accept either bearing.

edit - having just relooked your right they are different sizes.

At the risk of starting a riot there is nothing to stop you removing one of the tangs and running them in a single tang block.

The tangs are to help alignment.
The crush of the bearing into the bore should be what actually does the job of preventing the rotation, if you need the tangs to stop you spinning a bearing then the housing is out of spec anyway.

Modern cracked cap mains and rods actually don't have tangs at all (mostly due to manufacturing difficulty) and just rely on good tolerances.

Personal opinion, your better off knocking a tang off the correct lower half than changing the oiling dynamics by running two tops.

Edit to the edit - Just remembered why they stopped the 360 oiling, it was a done thing in the 60s believed to help oiling by subsequent research proved that it can actually limit oil flow and hurt the flow/pressure to the rod bearings.
It also takes away heat transfer area and seating area where the loadings are highest.

Not saying that is why BMW did it, just that the reason you don't often see it anymore across the whole industry.

[markus_74]

this is the picture of my 1989 engine crankshaft bearing house, the the lower has 1 tang and the upper has 2 tangs.

I have got the bearing part number 87369600 KS

[HairyScreech]

That's the late type two tang bearings.