2011 Mercedes S550 - M278 main (crankshaft) bearings
03-19-2023, 06:15 AM
#1
Newbie
Thread Starter
2011 Mercedes S550 - M278 main (crankshaft) bearings
I'm doing a rebuild of the M278 and can't find main bearings, the only one I found are chinese - SINOCMP and ULTRA POWER.
While I know there are no OEM main bearings, are there any from respectable manufacturers?
While I know there are no OEM main bearings, are there any from respectable manufacturers?
03-19-2023, 06:22 AM
#2
Out Of Control!!
Join Date: Sep 2018
Location: unbegrenzt
Posts: 13,508
Received 4,017 Likes
on
3,156 Posts
2017 GLE350 4MATIC
03-20-2023, 12:35 PM
#3
Super Member
Join Date: Jul 2019
Location: New Orleans
Posts: 709
Likes: 0
Received 274 Likes
on
205 Posts
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
There is only MB main bearings for M278, you can substitute with previous generation engine from OEM vendors, however the lock on the last bearing in M278 is cut on other side to prevent it, so either you cut new key hole in block and cap, or punch new lock in replacement bearing
03-20-2023, 12:40 PM
#5
Super Member
Join Date: Jul 2019
Location: New Orleans
Posts: 709
Likes: 0
Received 274 Likes
on
205 Posts
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
They are not discontinued, just replaced serial numbers, his WIS/EPC is outdated
Last edited by arsupisemnet; 03-20-2023 at 12:44 PM.
The following 3 users liked this post by arsupisemnet:
03-20-2023, 12:42 PM
#6
Super Member
Join Date: Jul 2019
Location: New Orleans
Posts: 709
Likes: 0
Received 274 Likes
on
205 Posts
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
Either way it might not work with OEM bearings because of two reasons - both block and crankshaft in stock option has deviation in diameter, that is why it has color coding in crankshaft and stamps on engine block. (color corresponds to different diameter) OEM substitution only works when you had to regrind crank (since no MB repair sizes available) and line hone engine block.
03-24-2023, 12:54 PM
#7
Newbie
Thread Starter
Either way it might not work with OEM bearings because of two reasons - both block and crankshaft in stock option has deviation in diameter, that is why it has color coding in crankshaft and stamps on engine block. (color corresponds to different diameter) OEM substitution only works when you had to regrind crank (since no MB repair sizes available) and line hone engine block.
Sorry, English is not my first language and sometimes I don't quite understand the details, hence my questions.
Trending Topics
03-25-2023, 11:20 PM
#8
Super Member
Join Date: Jul 2019
Location: New Orleans
Posts: 709
Likes: 0
Received 274 Likes
on
205 Posts
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
Best solution is to go through WIS and identify marking for upper half on block and lower half on crankshaft pulley shaft and buy accordingly to color coding from MB.
The following users liked this post:
chassis (03-29-2023)
08-10-2023, 01:28 AM
#10
Main bearing color coded
What’s WIS and how can I identify the bearing for my engine? My original bearing has two colors 2 gold and two green ( blue?). How can I find which color bearing go to which? Please help?
08-10-2023, 10:46 AM
#11
Thanks in advance,
