55K's - Has Anyone Replaced Oil Pump Chain Tensioner?
Fairly new on this forum as usually on MBClub UK, but do log in often to see what's happening here.
I have been reading through Sir-Boost-a-lot's Engine build thread with great interest, he's done a fantastic job of recording everything and the write up.
One thing that was very interesting to me were his pics showing the oil pump chain wearing grooves in the casing and his description of the noise. I love my car but ever since I've had it (3.5 years) it has made a bit of a racket and to a certain extent spoils the experience for me!! It makes a tappet/lifter sort of noise, I have even had lifters replaced by my MB dealer (they didn't know what the noise was), but the noise continues and I think this may finally be the culprit. I have heard similar engine noises on you-tube so I'm not alone. I notice the noise most when I listen from under the wheel arches.
Obviously removing the engine is a bit over the top so has anyone done this with the engine in the car and know what sort of labour is involved?
Any Info much appreciated.
Thanks
Links to posts in Sir-Boost-a-lot's thread. I hope he won't mind!!
https://mbworld.org/forums/5643945-post3.html
https://mbworld.org/forums/5808480-post154.html
1. the front cover needs to come out to actually remove the tensioner.
2. the main oil pan needs to be removed to loosen the oil pump to actually remove the chain, because even with the tensioner released the chain is not big enough to come out without slight loosening of oil pump. atleast on our cars.
3. Finally to remove the main pan youhave to drop, or least significantly lower the sub-frame which is alot of work, especially if you dont have a lift.
i'd say spend the time, pull the motor that way you can re-seal everything properly, as well as fix any other likely leaks, like a rear main or front crank seal.
Hope that was helpfull! CHEERS!!




1. the front cover needs to come out to actually remove the tensioner.
2. the main oil pan needs to be removed to loosen the oil pump to actually remove the chain, because even with the tensioner released the chain is not big enough to come out without slight loosening of oil pump. atleast on our cars.
3. Finally to remove the main pan youhave to drop, or least significantly lower the sub-frame which is alot of work, especially if you dont have a lift.
i'd say spend the time, pull the motor that way you can re-seal everything properly, as well as fix any other likely leaks, like a rear main or front crank seal.
Hope that was helpfull! CHEERS!!
To be honest I have spoken with a specialist indie over here in England and he said it would be a lot of work. He doesn't think my engine is particularly noisy anyway. His advice was to stop worrying about it and stop my dithering and fit headers then I wouldn't hear it
I was just hoping there may be a way simpler way round it. It seems such a stupid thing that the spring simply isn't strong enough.
Cheers Simon
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It's a lot of work, I just hope it cures it!
Last edited by simon1966; Jan 29, 2014 at 05:51 PM.
Mine sounds more noticeable when listening from under my passenger side wheel arch (your drivers side), it sounds worse when near parked cars or narrow cobbled streets etc as the sound gets amplified!
I tried to post a vid but it wont upload
Fairly new on this forum as usually on MBClub UK, but do log in often to see what's happening here.
I have been reading through Sir-Boost-a-lot's Engine build thread with great interest, he's done a fantastic job of recording everything and the write up.
One thing that was very interesting to me were his pics showing the oil pump chain wearing grooves in the casing and his description of the noise. I love my car but ever since I've had it (3.5 years) it has made a bit of a racket and to a certain extent spoils the experience for me!! It makes a tappet/lifter sort of noise, I have even had lifters replaced by my MB dealer (they didn't know what the noise was), but the noise continues and I think this may finally be the culprit. I have heard similar engine noises on you-tube so I'm not alone. I notice the noise most when I listen from under the wheel arches.
Obviously removing the engine is a bit over the top so has anyone done this with the engine in the car and know what sort of labour is involved?
Any Info much appreciated.
Thanks
Links to posts in Sir-Boost-a-lot's thread. I hope he won't mind!!
https://mbworld.org/forums/5643945-post3.html
https://mbworld.org/forums/5808480-post154.html
All services at MB main dealers. Maybe the varied oils used are some of the issue
I have no idea what filters have been used.
I just helped a buddy do his over the past week and a half. He wanted to do a converter and engine mounts anyways, so we pulled the engine and cleared up the slapping chain as well. It's smooth and quiet now!
I just helped a buddy do his over the past week and a half. He wanted to do a converter and engine mounts anyways, so we pulled the engine and cleared up the slapping chain as well. It's smooth and quiet now!

You always take such great pictures.
To be honest I would probably have left it as is, but I'm getting my motor mounts and sway bar anyway so helps cut down on the labour a bit.
The front cover is one of the more pain in the A$$ parts to take on and off on the engine (IMO), as it has a ton of silicone on it, special way to apply silicone so you dont block oil holes, have to work fast before silicone dry`s, and a ton of different size bolts. If you do take it off, would be good to change the front seal too.
These engines make a lot of noise and that noise can be transmitted around, so you may want to really investigate before pulling an engine to change an internal tensioner. Or at least put a big mod list together, like ported heads, 3000 stall and other bolt on mods that you can do at the same time.

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1. the front cover needs to come out to actually remove the tensioner.
2. the main oil pan needs to be removed to loosen the oil pump to actually remove the chain, because even with the tensioner released the chain is not big enough to come out without slight loosening of oil pump. atleast on our cars.
3. Finally to remove the main pan youhave to drop, or least significantly lower the sub-frame which is alot of work, especially if you dont have a lift.
i'd say spend the time, pull the motor that way you can re-seal everything properly, as well as fix any other likely leaks, like a rear main or front crank seal.
Hope that was helpfull! CHEERS!!





