M130 timing chain - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 06-16-2013, 05:40 PM Thread Starter
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M130 timing chain

Hi,
Can someone please advise what is the procedure of checking the tension on the timing chain on a M130 engine?

I plan to few couple of checks on the valves and since I'm there i might as well check the chain. I didn't know how to do the last time.

Thank you.
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post #2 of 8 (permalink) Old 06-17-2013, 12:37 AM
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Agillot seems cluey so may be able to help you more definatively, but this is what I have done in the past:
- take the rocker cover off, and try to push on the chain tensioner (on the side near the front - a lever arm - on the opposite side of the head to what can be seen in the picture) with a big screwdriver. It should barely move.
- rotate the engine to #1 TDC. There should be a mark on the back of the cam sprocket that should line up with a raised mark on the cam tower - about where the blue arrow is from memory. The yshould line up. If not, your chain has stretched.
M130 timing chain-m130-head.jpg
I don't know how much stretch is acceptable before it is time to change it though. Hopefully someone else can fill in that gap.

Cheers, Drew
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post #3 of 8 (permalink) Old 06-17-2013, 03:32 PM
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just to add , rotate engine to the right some , a quick starter actuation , or at crankshaft .take a 22 mm wrench , and now try rotating / put pressure at the cam to the right [ clockwise ] if you have a GOOD tensioner the sprocket will resist , if you have a worn tensioner , the sprocket will move , and you will see the chain get loose at right side .now it takes some experience to judge .the tensioner is not pressure fed , it is just fill with oil , and resiste collapsing .
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post #4 of 8 (permalink) Old 06-19-2013, 07:38 PM Thread Starter
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Thank you
I will try this tomorrow


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post #5 of 8 (permalink) Old 06-21-2013, 03:58 AM
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The mark often doesn't fits after a head-revision. Then you need balancing discs under the camshaft bearings.

If the chain is too long you can lift it with the fingers from the camshaft wheel. There is no stretch acceptable, because you're risking a engine damage, when the chain cracks.

Greets
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post #6 of 8 (permalink) Old 06-21-2013, 08:39 AM
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on a older engine , you will see that the timing marks at cam dont line up perfectly , always make sure you choose the retarded setting , dont set it on the advance side , the intake valves could hit pistons on deacceleration , causing a noise .most heads have been shaved .you could bump ingnition timing by 5 deg to compensate .
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post #7 of 8 (permalink) Old 06-26-2013, 02:58 PM Thread Starter
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How can I tell if the head was ever grinded?
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post #8 of 8 (permalink) Old 06-26-2013, 06:43 PM
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you measure the thickness , don t worrie too much about that , , this is a very basic engine that is not too anal .try getting a shop manual , it s all in there .e bay or amazon
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