can you identify this noise on my cls550?
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Joined: Apr 2016
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cls550
can you identify this noise on my cls550?
Need help identifying noise in my engine.. 35 seconds in the video. I have identify a different sound. It is a rattling sound coming from the middle of the left engine. I think it is a fuel throttle body?
Last edited by TTMBCLS; May 22, 2016 at 07:23 PM.
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Joined: Dec 2013
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From: Dubai
E 320
updated the video. The noise is coming from top left of the engine. What can this be? my guess is the intake cam. or the camshaft adjuster or timing chain?
Noisey v8 mercedes valve train - YouTube
Noisey v8 mercedes valve train - YouTube
Ticking or pulsing noise from high-pressure pump and fuel injectors -
Design group
07.02 Injection pump, unit pump, high pressure pump
Date
12-15-2014
Validity
All engines 276 / 278 / 157 / 152.
Reason for change
Inclusion of all current models
Complaint
High-frequency ticking or pulsing noise from high-pressure pump and/or fuel injectors.
Cause
For high-pressure pump:
Pump lifting piston inlet in piston seat.
For fuel injectors:
Closing noise of injector tips following injection.
This noise described in both instances is the normal sound level of components, characteristic to the high-pressure injection system.
Remedy
In the event of any noise complaints a reference vehicle must be used for comparison to assess the actual noise level.
Compare the noise in similar condition with or without foam enclosure for the high-pressure pump, with the engine hood closed, outside and from the inside the cabin.
Refer to general procedures and documentation related to engine complaints.
