RB26 engine noise

[scarvuk]

Been awhile but got a question for someone who might have a solution to my problem if it is one. The question is recently I've been hearing a noticeable tapping/valve train lifter noise inside cabin witch seems to be a little louder then remembered and increases with noise in rpm. It's a R32 GTR with 108,000km's any advice/common concerns before I start looking into it with a stethoscope to pinpoint noise. Also how often do the solid lifters need clearance adjustment? Note engine oil is 10w40 10tenths.

[GTSBoy]

Solid lifters may never need clearance adjustment. Most good Jap motors never show any wear on the valve train if looked after, and don't suffer valve seat recession either. But....these things can happen. You only need some oil starvation from a blocked gallery to cause a spot to wear.

So, no common problems on these, but all the possible problems are possible. Rip the covers off and use feeler gauges to determine the cold clearances and work from there.

[Duncan]

Is the noise more apparent when cold? A tapping that increases with revs and is louder when cold in a gtr can be a spun big end bearing. they can be surprisingly quiet at first...

Potentially anything else on the front of the engine so you could run it for a minute or 2 with the belts off and see if that stops the noise

The valvetrain and injectors are always pretty noisy, and as GTSBoy said generally never need servicing, unlikely to be the issue.