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M156 intake camshaft "skip" and weird phaser behavior
Hi all,
I just installed new intake camshafts on my M156 and after starting it up I got a P0011 (Bank 1 Intake camshaft position deviates from specified value).
I redid the timing on Bank 1 only but not successful, code P0011 still there and engine seems less happy than before.
So, today I reopened everything to do the timing on both banks at the same time and saw that my Bank 1 intake camshaft is acting weirdly when I'm cranking the engine.
You can see the phaser momentarily desynchronize from the adjuster at seconds 0:09 to 0:13 and the whole cam "skipping" at 1:46ish. All other cams are not behaving like that.
Yes, fresh hardware. I bought new washers and bolts again for the retiming I'm planning to do.
It was my first guess also that the bolt wasn't tight enough but I checked the torque and it's at ~115nm which seems normal for these bolts.
***Well, I watched this video series from Tasos while drinking my coffee this morning and I think he answered my question at 28:00 timestamp of this video: https://www.youtube.com/watch?v=3M2ILteRHHA***
Looks like him opening the adjuster this morning.
What happened? That skip isnt good. You said timing was good. Nice video to show. I hope you had the diamond washers in the right way, cam shaft bolts tightened right right torque...but even that wont cuase the skip on slow turn. So what happened?
I think it's the locking pin in the phaser that is slipping.
I opened the defaulting phaser and this is the condition of the backplate hole:
Honestly it doesn't look that bad compared to what I've seen on multiple YT videos. I think the phaser is slipping more than it will in reality because the phaser is empty of oil, so zero internal resistance.
I did flipped the locking pin, stretched the spring, fill them with oil and closed back both intake phasers. Planning to reinstall them next weekend.
Hey! Honestly, I only flipped the pin and stretched the spring. It was still skipping a bit when cranking by hand but never had timing or rattling issue with the phaser since. I think once the phasers are filled with oil it helps preventing the skipping.
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M156 intake camshaft "skip" and weird phaser behavior
