I got a Mercedes Benz, SL560, US style, 8 cylinder, from 1987, mileage around 130 000
I got the camshafts, rockers and valve changed these days as the lifters were a little weared out as i was told. So I decided to do it now than later.
But since the mechanic changed them I get a bad knocking noise and shaking at start up. It disappears after up to 5 minutes.
The mechanic said he only changed the parts. Thats it. Nothing else done. When I was there doing the work I say him using the chain. I left the shop as I could not wait till the work was done.
Someone told me that the clearance of the valve has to be checked and adjusted. Mechanics say that it is not possible as my engine is W117 and there is nothing to adjust. It will do it automatically.
I took the car back as clearly that mechanic could not do anything else then for the car. He also does not want the car back. He hung up when we tried to ask him to check the car again (like checking the timing chain).
Well. Inbetween I asked another shop to check it. They replaced only 3 rockers again. They were new!!! There was a slight damage on them. I guess this is the part of the rockers where you put the screwdriver on. That is why it was a bit “damaged”.
This second mechanic said I should just drive the car as the problem will be less in … dont know when. Hundred of miles, days, weeks?
I am not satisfied with this situation and therefore I am here to ask what the problem might be. This wasnt there before the camshaft was changed!
I cannot really make the mechanic do what I am asking for. I am now in an asian country and they do what they wanna do. I am only there to pay high prices and nothing is done what I wanted.
With this mechanic I am trying to get him to check the timing chain (chain tension) and plastic guide rails? Could this cause the problem or also something else?
I wanna know what it might be so that I can tell mechanic when he picks up the car - hopefully.
Thanks a lot already for your input.