OM642 Diesel - Turbo Whistle Under Acceleration?
07-30-2016, 11:09 PM
#1
Senior Member
Thread Starter
OM642 Diesel - Turbo Whistle Under Acceleration?
Wondering if some whistle noise is normal for the OM642 diesel under acceleration? Notice is especially when accelerating between 80 and 110km/h.
The following users liked this post:
MBSang (07-31-2016)
08-01-2016, 07:27 AM
#2
Out Of Control!!
I would say that is not normal--the first thing I would do is visit a dealer and ask if there is a TSB(technical service bulletin) on the subject!!
08-04-2016, 01:02 PM
#4
MBWorld Fanatic!
Join Date: Jan 2013
Location: Toronto, Canada
Posts: 3,684
Received 761 Likes
on
527 Posts
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, C5 Z06 & IS300 race cars, EQE 4Matic+ on order
The only time I've ever heard a hint of a turbo whistle from the OM642 was when standing outside of the car and it driving by at 3500 rpm in first gear (and that was much quieter than the diesel clatter). It is definitely not normally audible inside the cabin at any revs or speed.
While you may be hearing some wind or tire noise at those speeds, none should be originating from the motor. If there is a whistling noise coming form the engine, it is likely due to a problem or defect (you could have some kind of manifold / gasket leak or a problem withthe turbo). These would be more detectable at lower speeds though - it's the engine speed that matters, not the vehicle speed so when you're moving more slowly and thus have less wind or tire noise you could hear it more easily. If you are only hearing it at highway speeds, chances are it's tire or wind noise. Every time I get on the 407, the ML tires start singing a loud soprano passage...
While you may be hearing some wind or tire noise at those speeds, none should be originating from the motor. If there is a whistling noise coming form the engine, it is likely due to a problem or defect (you could have some kind of manifold / gasket leak or a problem withthe turbo). These would be more detectable at lower speeds though - it's the engine speed that matters, not the vehicle speed so when you're moving more slowly and thus have less wind or tire noise you could hear it more easily. If you are only hearing it at highway speeds, chances are it's tire or wind noise. Every time I get on the 407, the ML tires start singing a loud soprano passage...
04-18-2017, 09:16 AM
#5
Senior Member
Thread Starter
The only time I've ever heard a hint of a turbo whistle from the OM642 was when standing outside of the car and it driving by at 3500 rpm in first gear (and that was much quieter than the diesel clatter). It is definitely not normally audible inside the cabin at any revs or speed.
While you may be hearing some wind or tire noise at those speeds, none should be originating from the motor. If there is a whistling noise coming form the engine, it is likely due to a problem or defect (you could have some kind of manifold / gasket leak or a problem withthe turbo). These would be more detectable at lower speeds though - it's the engine speed that matters, not the vehicle speed so when you're moving more slowly and thus have less wind or tire noise you could hear it more easily. If you are only hearing it at highway speeds, chances are it's tire or wind noise. Every time I get on the 407, the ML tires start singing a loud soprano passage...
While you may be hearing some wind or tire noise at those speeds, none should be originating from the motor. If there is a whistling noise coming form the engine, it is likely due to a problem or defect (you could have some kind of manifold / gasket leak or a problem withthe turbo). These would be more detectable at lower speeds though - it's the engine speed that matters, not the vehicle speed so when you're moving more slowly and thus have less wind or tire noise you could hear it more easily. If you are only hearing it at highway speeds, chances are it's tire or wind noise. Every time I get on the 407, the ML tires start singing a loud soprano passage...
I sent it back to the shop and they are now waiting for a new manifold from Germany. Hopefully that fixed it.
Other than a few annoying squeaks that still aren't fixed, and this whistle issue, the car is pretty good.
