Rattling on cold start up
Thread Starter
Junior Member
Joined: Sep 2014
Posts: 23
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GL63 AMG
Rattling on cold start up
At times, I stand outside of my vehicle and start up my truck. I hear a rattling about 3 seconds after the start. The rattling almost sounds like a cover/shield of some type where the screws have come a little loose or something. I brought the vehicle to the dealership only to have them not find the sound (typical **** where the noise doesn't happen when you need it to).
Has anyone had this happen?
Has anyone had this happen?
MBWorld Fanatic!
Joined: Nov 2012
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A gaggle of MB's
Can be "noram" - after sitting overnite "ratle" can be one of two things: emission system coming from cold, or belt tensioner coming to pressure... what's more important is if the "rattle" continues significantly longer, or gets significantly louder...
Member
Joined: Mar 2013
Posts: 127
Likes: 3
2014 GL450
I was browsing STAR TekInfo the other day, this might be relevant (or not, depends on your engine part numbers):
05-19-2014
LI05.10-P-056435 Rattling noise after engine start for several seconds
Validity Engine 276, engine 278, engine 157 as follows:
Engine 157: Up to engine 1579xx 60 022333
Engine 2768: Up to engine 2768xx 30 001280
Engine 2769: Up to engine 2769xx 30 406603
Engine 278: Up to engine 2789xx 30 103675
Cause:
Secondary timing chains might produce a rattling sound during engine start up until the engine oil pressure builds up.
Once there is sufficient oil pressure created in secondary chain tensioners, they provide operating tensions to timing
chains and the rattling stops. No consequential damage is to be expected.
Remedy:
Install non-return valves (check valves) and replace left and right secondary chain tensioners as required. Install
check valves by inserting them into the tensioner oil supply opening in the left and the right cylinder head. Correctly
installed check valves and optimized secondary chain tensioners will minimize oil drainage from tensioners.
Order chain tensioners and check valves directly from parts with part numbers listed. Refer to the applicable engine
number to install correct version of the secondary chain tensioner.
05-19-2014
LI05.10-P-056435 Rattling noise after engine start for several seconds
Validity Engine 276, engine 278, engine 157 as follows:
Engine 157: Up to engine 1579xx 60 022333
Engine 2768: Up to engine 2768xx 30 001280
Engine 2769: Up to engine 2769xx 30 406603
Engine 278: Up to engine 2789xx 30 103675
Cause:
Secondary timing chains might produce a rattling sound during engine start up until the engine oil pressure builds up.
Once there is sufficient oil pressure created in secondary chain tensioners, they provide operating tensions to timing
chains and the rattling stops. No consequential damage is to be expected.
Remedy:
Install non-return valves (check valves) and replace left and right secondary chain tensioners as required. Install
check valves by inserting them into the tensioner oil supply opening in the left and the right cylinder head. Correctly
installed check valves and optimized secondary chain tensioners will minimize oil drainage from tensioners.
Order chain tensioners and check valves directly from parts with part numbers listed. Refer to the applicable engine
number to install correct version of the secondary chain tensioner.
Super Member
Joined: Sep 2002
Posts: 917
Likes: 86
did this TSB fix the problem? I have a 2013 GL450 that is in the engine range of the TSB.
I'm not sure my noise is the same thing. I hear this noise typically after a cold start usually right after I start reversing out of the garage in the morning. A few times I have heard it when shutting off the engine. It is a loud noise that almost sounds like I ran over a piece of metal siding or something or even like a loud firecracker.. It is momentary and then gone does not come again during that drive. Coming from the passenger side of the engine compartment, moderately loud. But it is not a dull thud or thunk like a typical suspension problem. It is a sharp noise
I'm not sure my noise is the same thing. I hear this noise typically after a cold start usually right after I start reversing out of the garage in the morning. A few times I have heard it when shutting off the engine. It is a loud noise that almost sounds like I ran over a piece of metal siding or something or even like a loud firecracker.. It is momentary and then gone does not come again during that drive. Coming from the passenger side of the engine compartment, moderately loud. But it is not a dull thud or thunk like a typical suspension problem. It is a sharp noise
