Engine noise
Thread Starter
Newbie
Joined: Oct 2014
Posts: 1
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w220 s320
Engine noise
Hi,
I have a strange summing noise once my engine gets good warm, it follows the engine rpm exactly so I know it is not coming from elsewhere. Its like it is more easy to hear on low rpm. I have replaced the belt tightening wheel and it was not that.
Can it be a water pump or oil pump, generator or what can it be?
It is a low frequency sound, going higher on higher rpm.
It gives me the creeps......
anybody had any similar experience?
I have a strange summing noise once my engine gets good warm, it follows the engine rpm exactly so I know it is not coming from elsewhere. Its like it is more easy to hear on low rpm. I have replaced the belt tightening wheel and it was not that.
Can it be a water pump or oil pump, generator or what can it be?
It is a low frequency sound, going higher on higher rpm.
It gives me the creeps......
anybody had any similar experience?
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
I have no idea what a summing noise sounds like.
In the USA (no idea where you are), virtually every auto parts store sells an inexpensive mechanic's stethoscope. This is a stethoscope that has a long, thin metal rod as its pickup device. These are very useful for locating and identifying mechanical noises by just touching various locations on the running engine.
In the USA (no idea where you are), virtually every auto parts store sells an inexpensive mechanic's stethoscope. This is a stethoscope that has a long, thin metal rod as its pickup device. These are very useful for locating and identifying mechanical noises by just touching various locations on the running engine.
