Weird Engine noise, any ideas??
Senior Member
Joined: Jan 2009
Posts: 327
Likes: 1
From: Isla Verde, Puerto Rico
SRT-6
I think it's the pulley. If you take it off it's easy to tell whether it's the bearing or pulley. My pulley wore out and started rattling similar to yours. I put a new bearing in it first, wasn't the bearing. The metal straps attach to rivets. Sometimes a strap breaks (fix it now) other times the straps wear at the rivet causing some looseness. You can drive with it like that a while but if a strap breaks it could be expensive. If it's a bearing, and it could be, take the belt off and turn the pulleys by hand. Usually it's the idler or supercharger bearing if its a pulley bearing. The way to tell if its the straps is to take the supercharger pulley off and twist it in your hands. If it makes noise, it's a time bomb. Here's what mine sounded like.
Les
Les
Last edited by Velociabstract; Jul 11, 2013 at 09:35 PM.
Trending Topics
Thread Starter
Newbie
Joined: Jul 2013
Posts: 11
Likes: 0
SLK32 AMG
Hi Les, thanks for that, forgot to mention, started car up with serpentine belt off and it made that noise still.... now im really worried. through all my reading been starting to think timing chain issues??
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Senior Member
Joined: Jan 2009
Posts: 327
Likes: 1
From: Isla Verde, Puerto Rico
SRT-6
Les
Member
Joined: Jan 2013
Posts: 241
Likes: 1
From: Edmonton
2003 C32 AMG
kinda sounds like a valve running without oil..
My m119 engine had an issue where one of the cam oiler tubes had broken inside the valve cover and resulted in a lifter running dry.
Im not sure if the m113k engine uses a similiar set up.
Does the sound increase with engine rpm?
My m119 engine had an issue where one of the cam oiler tubes had broken inside the valve cover and resulted in a lifter running dry.
Im not sure if the m113k engine uses a similiar set up.
Does the sound increase with engine rpm?
Thread Starter
Newbie
Joined: Jul 2013
Posts: 11
Likes: 0
SLK32 AMG
hi guys, thanks for your replies, the sound started off quiet and has been getting progressively louder and louder the more I drive it. Interesting about it is that it only does it when the engine is warm.
It has a rhythmic ritt ritt to it, and as I increase rpm it gets faster. On the open road you cant hear it at all, although this is possibly because its doing it so fast you cant hear it. I did take the serpentine belt off and stil it made the noise, so not supercharger.
So it must be from the block. Couple of questions I have....
- How would I know if its the chain tensioner just by visual inspection?
- Is it a massive mission to get all the way to the timing chain? I am technically minded but not a fundi at this.
- How would I know if the chain has stretched?
- Obviously I will look at the guide rails etc, but are there any other giveaway signs that the rails are game over?
- If I open up the block and the chain has too much play in it, does that mean chain stretched or chain tensioner more than likely game over?
Your opinions are proving very valuable....
It has a rhythmic ritt ritt to it, and as I increase rpm it gets faster. On the open road you cant hear it at all, although this is possibly because its doing it so fast you cant hear it. I did take the serpentine belt off and stil it made the noise, so not supercharger.
So it must be from the block. Couple of questions I have....
- How would I know if its the chain tensioner just by visual inspection?
- Is it a massive mission to get all the way to the timing chain? I am technically minded but not a fundi at this.
- How would I know if the chain has stretched?
- Obviously I will look at the guide rails etc, but are there any other giveaway signs that the rails are game over?
- If I open up the block and the chain has too much play in it, does that mean chain stretched or chain tensioner more than likely game over?
Your opinions are proving very valuable....
Senior Member
Joined: Jan 2009
Posts: 327
Likes: 1
From: Isla Verde, Puerto Rico
SRT-6
Dang, no one knows? I don't know the M112 that well, my M112 engine has only 18000 miles. On the M110 my timing was bouncing around so I bought a new tensioner and timing chain. When I cut a link and started threading the new chain on, part of a long guide rail broke off and fell. No prior symptoms. The tensioner does just that. Takes up the slack so .... the chain should be tight even with some stretch. I don't think it's the timing chain or tensioner. Again, I wish someone with more knowledge than I have would SPEAK UP! Geez.
Les
Les
