All Things Mk5 > Mk5 General Area
Cam Shaft Adjuster Oil Seals
OllieVRS:
Yes Block 93 looks perfect, assuming the engine is fully up to temp. Unfortunately I don't have enough experience to say what the exact cause is, but as you said, oil control rings first, the inspect the more expensive stuff.
Your revs seem weirdly high, have you always idled at 800? Mine hovers between 720/760.
RussH:
So I've been checking VCDS again and something has changed or I didn't notice it before.
After getting up to temperature 091 settled down with slight movement on actual 27.5 to 28.5 but the noise was still there.
But.
093 changed from -2 to 3. Yes positive 3!?
Should 093 alter with rev's? It doesn't move.
I'll stick with plan A of changing the seals but is this now looking like a failing valve timing control module?
Idle has always been around the 800 (I think) it has been mapped though. Note. I'm confident this issue isn't related to the map as it was was done 7+yrs ago.
ROH ECHT:
It could all be related to oil flow and containment throughout the VVT system.
Yes, always give it new oil containment rings when swapping the chain and tensioner.
Make sure the tensioner's oil inlet screen wasn't left behind; stuck to the head when you added the new tensioner. The cam phaser/adjuster can also be the cause due to internal wear. The oil flow from the sump may be the problem for having a restriction to oil flow somewhere. And remove and clean the N205's oil pickup screen from the lower lip of the chain cover.
N205 pickup screen:
Chain tensioner screen...meant to be on the tensioner, not stuck to the head:
RussH:
Thanks for the reply and those pointers :happy2:
I'll be sure to report back once I've got into the module and changed the seals.
Any thoughts on why 093 went from -2 to +3?
pudding:
I had a very loud rattle on mine that was only apparent when hot. Just off idle the noise kicked in, and stayed there until about 1700rpm and then went silent again. Quite embarrassing when crawling along in traffic.
After a year of trying this, trying that, I eventually traced it to the middle oil control ring that had broken.
Incredible such a small thing caused so much noise, but after a fresh set of oil control rings, problem solved :smiley: You can easily tell if you have this problem by simply unplugging the VVT solenoid and revving it up. Silence = busted oil ring(s).
They are incredibly brittle, even when new, so you have to be careful when sliding the chain cover back on.
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