OM651 chain rattle on start up
Thread Starter
Member
Joined: Oct 2014
Posts: 222
Likes: 2
From: Melbourne Australia
MY06 E55
OM651 chain rattle on start up
I have a 270,000 km SUV with the OM651 diesel, on cols start it rattles like a bucket of bolts and then shuts up as the oil pressure builds up. after that is fine. car drives perfect, no lights.
now it is due for an oil change. as this is a high mileage engine, what viscosity do you recommend ? for Australia, not extreme cold here.
I am considering doing the tensioner. anything to look out for ?
i am also considering doing the chain as well, i don't want to pull the motor and do the guides as thats a monster job.
in the past on other cars, i have done chain replacements by attaching the new chain to the old one and slowly cranking it through, obviously with everything still linking meshing on the top cams and so on.
anyone done this before ? any pointers ?
Thanks in advance.
now it is due for an oil change. as this is a high mileage engine, what viscosity do you recommend ? for Australia, not extreme cold here.
I am considering doing the tensioner. anything to look out for ?
i am also considering doing the chain as well, i don't want to pull the motor and do the guides as thats a monster job.
in the past on other cars, i have done chain replacements by attaching the new chain to the old one and slowly cranking it through, obviously with everything still linking meshing on the top cams and so on.
anyone done this before ? any pointers ?
Thanks in advance.
Super Member
Joined: Jun 2022
Posts: 739
Likes: 328
From: WA State, USA
2014 Cummins, 2014 E250 Bluetec
Havnt done it but dont forget the chain tensioner plug (forgot the name for it), theoretically those can go out as well and are heck of alot easier to replace. EDIT maybe thats what ya meant by the tensioner, been long week already.
As for oil stick with the specs or join the chaos that is oil recommendation threads.
As for oil stick with the specs or join the chaos that is oil recommendation threads.
Last edited by Quint22; Jan 28, 2025 at 10:56 PM.
Thread Starter
Member
Joined: Oct 2014
Posts: 222
Likes: 2
From: Melbourne Australia
MY06 E55
Thanks, yeah I have made the mistake of not putting MB229.5 oil before in my other AMGs and it never ended well 
The chain tensioner plug is the tensioner thing I was talking about.
Are they as easy to pull and swap as people make it out to be ?
The chain tensioner plug is the tensioner thing I was talking about.
Are they as easy to pull and swap as people make it out to be ?
MBWorld Fanatic!
Joined: Apr 2003
Posts: 1,035
Likes: 277
From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
Go with what the owner's manual tells you for oil. Otherwise you are opening up a can of worms by asking in a forum. One guy here will even tell you to put in the oil that is made for big rig trucks LOL
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,921
Likes: 522
From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
My (Diesel) GLK can use oil meeting MB228.51, and there are oils that meet that spec as well as the CK-4 spec, the best of both worlds, IMHO.
If your 300SE has flat tappets, one of the best oils you can get for it (IMHO) these days is Shell Rotella T-6, a Diesel oil with higher levels of zinc than gas engine oils have these days. (Why? because zinc poisons the latest catalytic converters.) T-6 used to carry a spark ignition rating, (SM), but they removed it when the newest converters became incompatible.
YMMV...
Last edited by John CC; Jan 30, 2025 at 07:11 PM.
