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MOAN

Member Since 14 Jan 2010
Offline Last Active Sep 12 2011 04:04 AM

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4G93T Head noise..

01 July 2011 - 12:57 AM

I've just had my GSR rebuit.

CP Pistons 20thou over, spool rods, all balanced etc etc

Everything seems perfect except this horrendous head noise. I know the 93's are renowned for lifter rattle so initially we assumed it was that. The builder just replaced the lifters with arftermarket "non-ticking" lifters that I got from Meek. Now, this has quietened it down quite a lot but there is still a significant ticking. Apparently there is no clearance on the lifters whatsoever and there is plenty of oil getting to them. It is a consistent ticking regardless of what temperature the car is at.

The builder and his machinist have racked their brains trying to work out what this ticking is and this is a little beyond my knowledge of engines. They were thinking maybe rocker arms? Someone else also mentioned valve springs to me?

Others have suggested oil additives which I (and the builder) am incredibly reluctant to use on such a fresh engine (1200kms).

Anyway, I guess I'm just chasing some suggestions to go through with him as I just spend a small fortune having it built and I'd really like to eliminate this noise.

Thanks in advance!