anyone familiar with the removal and installation of the camshaft on the M274.920 engine?
im in the process of installing a new camshaft due to a P001685 code that another member has seemed to solve but he seems to be inactive on here so hasn't replied to my questions.
upon removal, i noticed the camshaft and camshaft positioners have a hole for what i assume would be a pin or something to keep the positioner from spinning freely but i did not see one on the previous cam when i took off the positioner. now im wondering if i lost it. otherwise i don't understand how the camshaft positioner will stay put and not just spin freely since it has a sprocket on it and is attached to the chain.

anyone have any insight on this?
https://photos.app.*******/5a2A5j1wxPab9ZGT9

 

i guess there is no pin. I put everything together and rotated the crank a few times and both sprockets spun and rested at tdc every time. strange how that works. now i gotta figure out how to find a green o-ring on the center base of the head that seems to be pretty worn. mercedes parts catalog isn't very detailed.

 

@RebornS14 The O-ring that goes between the head and the valve cover/? Send me you VIN.

 

@MBENZTECH it was a coolant passage. it's the one that seals the pipe on the front middle of the valve cover on the M274.920 but i just ended up reusing it after finding the valve cover side to be raised to press into the o-ring. i put everything back together and it sealed fine. thank you

have you tackled a P001685 yourself on one of these engines?

 

@RebornS14 I've tackled more timing jobs that I would like to. Before changing parts, did you verify that the timing was actually out of time?? The camshaft reluctor wheels are known to move out of position.

 

that's the reason i wanted to replace the cam only without the sprocket. i've seen another member hammer back the reluctor wheel on a different mbz engine which seems to have worked for him. wasn't a way to do that on this engine so i just swapped out the cam to see if that did the job. so far so good. engine starts right up and no more CEL for the cam timing but now i have a new pending code for oil pump valve? P06DA00
i thought maybe a loose connector but i made to sure it was in and locked. can't even pull it out. but this one isn't setting off the CEL...yet.

 

sent PM