OM651 220 cdi knocking sound from engine
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
OM651 220 cdi knocking sound from engine
Hi !
While driving yesterday during normal operation and load, a knocking sound and some vibrations came which follows the engine revs, at first it was only appearing at low revs and whith a little acceleration, but now it is easy to hear at idle in neutral.
Disconnected el connector on injectors one by one and start engine to see if the sound would change or dissapear, no change though.
Link to video:
Anyone have idea of what this could be ?
Regards:
Jobba
While driving yesterday during normal operation and load, a knocking sound and some vibrations came which follows the engine revs, at first it was only appearing at low revs and whith a little acceleration, but now it is easy to hear at idle in neutral.
Disconnected el connector on injectors one by one and start engine to see if the sound would change or dissapear, no change though.
Link to video:
Anyone have idea of what this could be ?
Regards:
Jobba
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,922
Likes: 522
From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
Hard to tell for sure from a recording, but that does not sound good. If shutting off the injectors one at a time did not change the sound then my next guess would be a rod bearing.
Drain (not suck or extract) the engine oil and look for a metallic sheen or even bits of bearing material. Check the oil filter, too.
Drain (not suck or extract) the engine oil and look for a metallic sheen or even bits of bearing material. Check the oil filter, too.
MBWorld Fanatic!
Joined: Apr 2003
Posts: 1,036
Likes: 277
From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
Do you know the service history of that engine? How often was the oil changed and what oil was used? Was it ever run low on oil or overheated?
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
The car is a previous Taxi with high mileage (480 000 km), service program has been followed, had a oil leak on the oil cooler and had low oil level warning, but oil level still within low mark on dipstick. Oil and filter`s on both engine and transmission changed 4 months ago with MB Spec products.
As i see it i am suspecting 2 possible problems:
1 - Piston rod bearing.
2 - Hydraulic lifter/Rocker arm`s.
Anyone know if it is possible to remove oil sump with engine in place and check the crankshaft/piston rod bearings ?
Also, is it possible to rule out injector issues without having the injectors pulled out ?
Regards:
Jobba
As i see it i am suspecting 2 possible problems:
1 - Piston rod bearing.
2 - Hydraulic lifter/Rocker arm`s.
Anyone know if it is possible to remove oil sump with engine in place and check the crankshaft/piston rod bearings ?
Also, is it possible to rule out injector issues without having the injectors pulled out ?
Regards:
Jobba
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
Hi again !
I am considering to buy a complete engine from the salvage yard.
Does anyone know if it will require a lot reprogramming/coding of components that is installed on the replacement engine ?
If so it might be easier to swap the parts that will require coding from my original engine ?
Regards:
Jobba
I am considering to buy a complete engine from the salvage yard.
Does anyone know if it will require a lot reprogramming/coding of components that is installed on the replacement engine ?
If so it might be easier to swap the parts that will require coding from my original engine ?
Regards:
Jobba
MBWorld Fanatic!
Joined: Apr 2003
Posts: 1,036
Likes: 277
From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
The car is a previous Taxi with high mileage (480 000 km), service program has been followed, had a oil leak on the oil cooler and had low oil level warning, but oil level still within low mark on dipstick. Oil and filter`s on both engine and transmission changed 4 months ago with MB Spec products.
As i see it i am suspecting 2 possible problems:
1 - Piston rod bearing.
2 - Hydraulic lifter/Rocker arm`s.
Anyone know if it is possible to remove oil sump with engine in place and check the crankshaft/piston rod bearings ?
Also, is it possible to rule out injector issues without having the injectors pulled out ?
Regards:
Jobba
As i see it i am suspecting 2 possible problems:
1 - Piston rod bearing.
2 - Hydraulic lifter/Rocker arm`s.
Anyone know if it is possible to remove oil sump with engine in place and check the crankshaft/piston rod bearings ?
Also, is it possible to rule out injector issues without having the injectors pulled out ?
Regards:
Jobba
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,922
Likes: 522
From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
You could pull the valve cover off and check the valve train. Probably worth a try. Also, if you can, disable the fuel pump so there is no rail pressure, then crank it over and see if it still makes the noise.
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Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
I also think it sounds like a rod bearing, have not checked the oil pressure yet, i assume that if the rod bearing is so much worn it would also result in a major drop in oil pressure ?
Anyone know what the oil pressure should be at idle ?
Also what i am thinking about is the really rough idle and vibration, could that really be a result of a worn rod bearing ?
Regards:
Jan Ove
Anyone know what the oil pressure should be at idle ?
Also what i am thinking about is the really rough idle and vibration, could that really be a result of a worn rod bearing ?
Regards:
Jan Ove
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
The taxi had to have good care when it reached 480,000 km.
You have engine model, who never reached America, but I still think you will find "smoothest test" what is simulated compression test with good scanner. Don't think those engines have oil pressure sensor, but don't take my word for it.
As for engine swap, modern engines do have individual modules, who need to be paired/coded with ECU and each other.
When you save old modules and transfer them on replacement engine, no programming will be necessary.
that applies to injectors as well,
You have engine model, who never reached America, but I still think you will find "smoothest test" what is simulated compression test with good scanner. Don't think those engines have oil pressure sensor, but don't take my word for it.
As for engine swap, modern engines do have individual modules, who need to be paired/coded with ECU and each other.
When you save old modules and transfer them on replacement engine, no programming will be necessary.
that applies to injectors as well,
Last edited by kajtek1; Jan 23, 2024 at 06:23 PM.
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
I assume following if replacement engine is same version 651.924 and have the same wiring loom:
* Injectors.
* Turbo wastegate actuator.
Regards:
Jobba
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Anything, what has bigger box with electronics in it.
Injectors don't have build-in modules, but they do have calibration and that's why they need to be entered to ECU.
Injectors don't have build-in modules, but they do have calibration and that's why they need to be entered to ECU.
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
I found a replacement engine that i plan to transplant into my car (200 CDI, OM651.925, original is 220 CDI, OM651.924)
The replacement engine has run 213 000 km, any opinions of anything that would be smart to do while engine and gearbox (AT 7 speed) is out anyway other than the normal service fluid & filters ?
* Replace all o-rings and seals on Oil filter housing/Oil cooler.
* Replace Timing chain.
* New gasket`s Turbo/Manifold.
Regards:
Jobba
The replacement engine has run 213 000 km, any opinions of anything that would be smart to do while engine and gearbox (AT 7 speed) is out anyway other than the normal service fluid & filters ?
* Replace all o-rings and seals on Oil filter housing/Oil cooler.
* Replace Timing chain.
* New gasket`s Turbo/Manifold.
Regards:
Jobba
Last edited by Jobba; Jan 31, 2024 at 01:30 AM.
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
Hi All !
I am in the process of replacing the engine in my car (My VIN is: WDD2122021A668173), VIN for "Donor" car: WDD2120051A152280
Original engine is OM651.924, replacement engine is OM651.925
The differences i have discovered so far is:
If anyone has Torque specs available for engine and components that would be much appreciated.
Regards:Jobba
I am in the process of replacing the engine in my car (My VIN is: WDD2122021A668173), VIN for "Donor" car: WDD2120051A152280
Original engine is OM651.924, replacement engine is OM651.925
The differences i have discovered so far is:
- Different Turbo.
- Oli supply piping to turbo.
- Oil return piping from turbo.
- Different flywheel.
- Different upper and lower oil sump.
- Different dipstick tubing.
- Various brackets on engine.
If anyone has Torque specs available for engine and components that would be much appreciated.
Regards:Jobba
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 42
Likes: 2
From: Norway / Rogaland
E 220 Wagon, 2012 mod.
Engine swap is done, no issues. (When i removed the lower and upper oil pan it became clear that that it surely was lower piston rod bearing that was worn out), also when i drained the oil it was the very expensive "Metallic" oil coming out...
Like i mentioned earlier my car is 2012 mod, and replacement motor came from a 2010 mod. there was a change in some engine components design, i think in 2011 and at least on my motor i was able to move over upper oil sump (The aluminum part above the plastic oil pan), this had a different placement and orientation of the dipstick tube (Happy i had to do this as the old sealant & gaskets where hard and probably would not seal properly..
There is also a new design on the cylinder head including valve/rocker cover, as the bolt holes for my valve/rocker cover is different i was not able to move this over from my old motor, so when ordering replacement gasket this is not matching the car`s VIN.
No electirical issues or coding/programming needed as i kept my original motors wiring loom, ECU and moved injectors from old to new motor.
Regards:
Jobba
