M112 Engine Experts: Is this timing chain stretched? +Video - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 12-07-2014, 05:06 PM Thread Starter
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Exclamation M112 Engine Experts: Is this timing chain stretched? +Video

I have been having some serious engine noise on this M112 with only 110k miles. So I took the valve cover off to inspect the timing chain.

Here is the video where I am moving the chain with a screwdriver. Of course the timing chain tensioner is still in place.

Here I am using a screwdriver to move the chain.
http://youtu.be/iUIvedD_WUo

I am not sure if this was the best way to check. I know these engines are bulletproof but there have been a few cases of worn guide rails and bad tensioners out there so I though maybe this is one of them.

Let me know what you think after you watch the video.

Last edited by hilarushi; 12-07-2014 at 06:37 PM.
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post #2 of 6 (permalink) Old 12-07-2014, 05:25 PM
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Video is set to private.
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post #3 of 6 (permalink) Old 12-07-2014, 06:30 PM
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There is a test for the chain stretch that diesel owners usually perform at 500,000 miles.
I am not there yet, so did not have to do it.
With valve cover open, you set the top marks and see the angle on the crankshaft scale.
I would guess there such procedure for gas engine as well, so it is a matter of finding WIS
Did not see video but sounds like you have tensioner issue.


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post #4 of 6 (permalink) Old 12-07-2014, 06:38 PM Thread Starter
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Sorry I initially set the video to private.

Here it is the same link set to public.

http://youtu.be/iUIvedD_WUo
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post #5 of 6 (permalink) Old 12-07-2014, 07:21 PM
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To be honest, in my experience, the timing chain is not supposed to be so tight that you can't bend it -- otherwise it'd cause issues at 6000+ RPM.

Take off the valve cover for the other head and then measure it according to this guide. If they line up, timing chain is good. If they don't, something is wrong.
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post #6 of 6 (permalink) Old 12-08-2014, 02:28 PM
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Quote:
Originally Posted by hilarushi View Post
I have been having some serious engine noise on this M112 with only 110k miles. So I took the valve cover off to inspect the timing chain.
What kind of engine noise? Timing chain rattle is very obvious, as it is loud at engine start, and gets quieter after warm-up. Maybe you could use a 'mechanics stethoscope' to get closer to the problem. Or remove the poly V-belt and (briefly) run the engine. That will eliminate lots of moving parts that can make weird noises when worn out.

Quote:
Here is the video where I am moving the chain with a screwdriver. Of course the timing chain tensioner is still in place.
You would not check chain stretch like that! The only reliable method would be to remove the chain and measure it.
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