The V8 Owners Forum -

With regard to the frequency of the knocking, it is not constant but when it happens it is regular (ish). Having run the engine with the rocker covers off, trying to source the noise, it appears to be timed to valves opening on predominantly cylinder 5.

The noise completely goes away for a good ...

Hi Dennis

Thanks for the info.

It doesn't sound like a slipped or slipping liner then to be honest. there were no marks on the heads and i don't think any were noticeably low.

This leaves me still totally perplexed

Anybody got any other thoughts?

Thanks
Andy

Hi All

Thanks for responses.

The noise is probably more nearside than offside. having gone over the whole engine with a stethoscope, the noise appears to be more pronounced around cylinders 3 and 5.

Having taken the heads off, I didn't see any obvious signs of a slipped liner, but don't really ...

Hi Jim

We have done the HT lead removal trick, even done the injector plug removal trick, and there is no difference when disconnecting any cylinder. I am hoping this rules out: big ends, little ends and piston slap, unless anyone thinks different.

Thoughts welcomed...

Has anyone ever had ...

Engine is totally stock, RR is my dad's run around. 4.2 has been perfectly enough power despite us all doing a lot of towing.

Definitely agree with the noises from the gaskets, but we have replaced these ones and tightened to specified torque. also checked with hand for blowing.

The noise we are ...

Hi Ian

Sorry should have mentioned that one. Yep new exhaust gaskets manifold to head. we do have slight manifold to down pipe leak, but our noise is a knock rather than a blow (although there is obviously a blow as well!

Thanks
Andy

Hi All

Hoping someone here has some more ideas as we are running out fast...

We have a knocking sound very much like top end noise probably more evident on the nearside of the car than the offside.

We have so far: changed the cam (for new standard cam), cam followers for new hydraulic ones ...