Valve head cleaning and guide wear..

[glynherron]

There's nothing wrong with boring out and collapsing the thin wall that's left out but you would only do this if replacing the whole guide. The Rapid Technologies repair sleeves are similar to the K-Line or Nucleus sleeving systems.

Agreed. Sorry if I was unclear.

If replacing the whole guide he bores them and collapses but not for the inserts.

Thanks

[sailorbob]

If the whole valve guide is to be replaced then the head will need heating up. Expect to pay around £15 per guide regardless of whether it's a complete guide or sleeve that's fitted.

[Mike6]

I had this done a couple of years ago. The very experienced engineering shop was a bit reluctant to take out and replace the guides and said that a safer repair would be K-liners which are phosper bronze. They did a very good job and there was next to no sideways play.

This is technology used on lorries which cover huge distances and has a proven record

[glynherron]

Great to hear that it's a proven technology. Thanks for your feedback.

He was wanting to skim the head as a matter of course. I said a definite no and just to measure!

[Vulcan Grey]

yes, I would also say, DO NOT skim the head unless absolutely positively necessary!