Post by
Ryantzer »
https://forums.nicoclub.com/ryantzer-u223805.html
Fri Jul 09, 2021 6:13 pm
After getting my '90 Q45 back together with new timing chain guides it seems to have timing chain noise from the area of the cam sprockets on the right bank. The timing covers and valve covers had been sloppily resealed before I got the car so I have some concerns about bits of RTV finding their way into the oil system (although the oil filter should prevent them from circulating through the engine). My concern is that the chain tensioner is not getting oil pressure - is it possible to remove the tensioner and crank the engine (fuel pump fuse removed) to see if the tensioner is receiving oil through it's oil supply hole, or does cranking the engine without the tensioner installed stand too much of a chance of causing the chain to jump timing?
The tensioners are new along with the timing chain guides. I have another new tensioner that I can install just to rule it out as a problem.
I left off the upper chain guides that go between the cam sprockets as I have seen recommended, and as I had done with no issue on a KA24DE a number of years ago.
Any other thoughts on diagnosing the issue are welcome.
Attached photo is of the new tensioner after having run the engine for a short time. Does it look like it's properly extended?
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