Tapping sound, cold idle

[slow13dude]

Hi all,

My R32 GTR has a tapping sound in the engine on cold-start idle.

The sound is not there under throttle.

The sound is not there once the engine is warm (some driving) and idle.

My friend says it's lifters and that I should use diesel oil to quiten them.

What do others think?

[SteveL]

My friend says it's lifters and that I should use diesel oil to quiten them.

RB26 engine uses 'solid' lifters with correct cam clearance adjusted by using various thickness shims under the lifter buckets. Your friend is assuming you have hydraulic lifters, but this method will have no effect.

Assuming the noise is related to cam lobe clearance, probably best to check all the clearances or have them checked.

[[WLDCRD]]

mine did that once.....and when i accelerated it got louder....so i turned it off....then later started it up again and it stopped.

[VL-TRBO-RB20]

isnt it because when its cold generally there is no oil in the lifters? so its just got to bleed a little bit of oil into it then its sweet...

[Amaru]

isnt it because when its cold generally there is no oil in the lifters? so its just got to bleed a little bit of oil into it then its sweet...

Refer to solid lifter comment above

[slow13dude]

So it doesn't matter right?

[SLY33]

lifter noise generally isnt a problem, just get your valve clearances checked/adjusted.

dont go throwing diesel oil in there.

[slow13dude]

I had a thought, since the sound is only there on cold idle, could it be insufficient oil pressure? Would a new oil pump help?