Jobba

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

John CC

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.

300SE1993

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?

Jobba

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

Jobba

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

300SE1993

I hate to be the bearer of bad news, but I am pretty sure those taxis do not get proper care and maintenance no matter what they told you. On this one, most likely the low oil problem happened before you bought it and it was ignored until it was too late, then they dumped the car. One guy on Youtube bought one with similar mileage and the engine self destructed shortly after he purchased it.

John CC

You've already done that by pulling the plug on each injector. Even if you had one that was leaking, it would change when you disconnected it.

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.

tjts1

Sounds like a rod bearing.

Jobba

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

kajtek1

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,

Jobba

Do you know which components that needs to be transferred from the old engine to avoid programming ?
I assume following if replacement engine is same version 651.924 and have the same wiring loom:
* Injectors.
* Turbo wastegate actuator.

Regards:
Jobba

kajtek1

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.

Jobba

Anyone have the WIS for engine replacement available ?

Regards:
Jobba

Jobba

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

Jobba

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:

• 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.

Regarding the difference in the oil sumps i don't want to risk that it does not fit in the engine bay, so i will swap this over, but i am struggling to find the correct OEM seal part number for the upper part (aluminium), anyone that has replaced this and have the part number ?

If anyone has Torque specs available for engine and components that would be much appreciated.

Regards:Jobba

rapidoxidation

The WIS can be had on ebay for about $20
Not sure if you can get it in Norway, but it wouldn't hurt to try. I surely wouldn't do the job blind.

Pieterblurb

Jobba, good luck with the swap. I am very interested because my engine E250 is after overheating and now has that dreaded knocking sound too.

Jobba

Hi !
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

Quint22

Congrats