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The greatest offset woodruff key can correct up to 10 degrees at the crank maximum. I am already at 12 degrees. Something in the timing is beyond allowable I believe. My question though remains, why is the right cam so far off and the left one so good? Does chain stretch only affect the right cam or is it the tensioner located on the right side that is the culprit. Does anyone else suggest offset keys or should I just bellyup and buy chain, tensioner and 3 side rails (forget the tensioner rail?). I would like to order all the parts at one time since it is my daily driver.
I did try using a dial indicator and magnetic base but just about everything is aluminum. i finally rigged it up and after getting my readings i realised I did not adjust the valves for 0 cleareance so my measures are probably off. I measured 17 degrees when #1 intake opened 2mm and 10 degrees on the crank when #6 opened 2mm. in reading some other posts the convention is not to bother with the dial indicator, just line up the cam marks and read the crank.
In the photo you can see the pulling side of the gear teeth on the cam sprocket. They appear gray in the photo. They are slightly rough, not polished smooth so I think i need to change the cam sprocket(s) as well. You can also see the 18 year old rails with 100k on them. i guess the color would indicate that they may still be OK but I should probably change them anyway for peace of mind.
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1972 450SL
1982 300D Turbo
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