2012 GL350 Engine Noise - not timing chain
09-28-2018, 05:15 PM
#1
Newbie
Thread Starter
Join Date: Sep 2018
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
2012 GL350
2012 GL350 Engine Noise - not timing chain
HELP NEEDED
I've tried to read through as many different threads as possible before posting.
I have a 2012 Mercedes GL350 with roughly 56,000 miles on it. The vehicle was making it's usual diesel noise (we also have a 2005 Sprinter 2500). It was also making this intermittent slap noise, and after some research we figured it was the timing chain - which we just replaced it but we still have the intermittent slap noise.
Points are:
On further investigation, the noise sounds like it's coming from the back of the engine
I've included a sound clip
It's not rhythmic - for example, it does not have a consistent knock sound
The noise only appears when in "Park" - once in gear noise goes away
Unbolted converter, and moved away from engine - noise still occurs
Our thoughts:
Flexplate
I've tried to read through as many different threads as possible before posting.
I have a 2012 Mercedes GL350 with roughly 56,000 miles on it. The vehicle was making it's usual diesel noise (we also have a 2005 Sprinter 2500). It was also making this intermittent slap noise, and after some research we figured it was the timing chain - which we just replaced it but we still have the intermittent slap noise.
Points are:
On further investigation, the noise sounds like it's coming from the back of the engine
I've included a sound clip
It's not rhythmic - for example, it does not have a consistent knock sound
The noise only appears when in "Park" - once in gear noise goes away
Unbolted converter, and moved away from engine - noise still occurs
Our thoughts:
Flexplate
Last edited by Sarah Burgess; 09-28-2018 at 05:53 PM. Reason: Added wrong sound clip
09-28-2018, 11:41 PM
#2
Senior Member
Join Date: Jan 2011
Location: McDade, Texas
Posts: 422
Likes: 0
Received 52 Likes
on
44 Posts
W211 e320 CDI
Sounds to irregular to be timing chain, neither crank speed (rods) nor 1/2 crank speed (valve train)...just a tiny observation based on tiny sound clip. Was tranny removed in recent past?
09-29-2018, 11:09 AM
#3
MBWorld Fanatic!
Join Date: Jan 2009
Location: V E G A S
Posts: 9,109
Received 1,744 Likes
on
1,391 Posts
1922 Ford Model T / no OBD
Did you check if that is combustion noise? Observe tailpipe for pufs?
If not, that might be loose bolt or chunk of dirt at flywheel.
If not, that might be loose bolt or chunk of dirt at flywheel.
10-01-2018, 05:53 PM
#5
Senior Member
Join Date: Jan 2011
Location: McDade, Texas
Posts: 422
Likes: 0
Received 52 Likes
on
44 Posts
W211 e320 CDI
A lot of phone apps allow for recording frequencies and amplitudes of sounds, this can be used to determine rpm....or set belt tensions, lots of uses really
