Quote:
Originally Posted by C.Doner
That sounds like the timing chain hitting a guide or something. Maybe your tensioner is failing. I'd do the entire chain set if it is determined to be the culprit. I'm not sure about the m103 but the m110 looks very challenging to complete. You can use a piece of hose to help determine where the noise is coming from by sticking one end to your ear and the other end to the suspected area. The chain would be making noise in the front of the engine only.
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The timing chain was changed 4 years ago.
But with a very low cust part.
The chain tensioner has just been out and re fitted do to a change of the front cover U gasket that is known to fail.
The tensioner seemed strong and was "as always" very hard to schrew in place, because you have to Press it in while you schrew it on.
I asked the Mercedes dealer and they told me the tensioner is not available anymore, out of production
So I checked it my self on the EPC and it says in the system that it is so
But I have bought a new chain to day, just waiting for it to arrive with the mail.
Another thing I discovered 2 years ago when I made a head gasket replacement, was that the. Valves had made contact with the pistons
But only on the edge of the piston valve pockets.
And the sound was also there at that time.
So my own guess is also that the chain has stretched and made the timing out of its place.
But could that really be the case, I know for a fact the timing and cam shafts was set in the right position with the 4mm dowel holes to the top edge of the cylinder head and the inlet cam shaft adjuster was set clockwise as it should.
So the rattling sound must come from the valves hitting the pistons I guess because
the sound is not coming from the front always but from the middle and sometimes back of the engine.
But why is it then disappearing when the engine gets to operating temperature
Does any of this info give you more answers ?