Loose valve guide in block
 

What do the experts do to when an exhaust valve guide is loose in the block???. Situation: bought an 8n Ford tractor (same valve guides as flathead). Sat over winter and front three exhaust valves stuck open. #3 guide loose in the block so it was able to drop down and ride the lifter with the spring compressed. No damage done. Got everything apart and rust cleaned away on valve stems and inside guides. There is a lot of oily carbon in the valve pockets on that cylinder, but the top of the piston has no carbon at all on it--indicates oil coming up that valve guide to me. My first choice would be an intake guide rubber seal, but I don't have one. Ideas and suggestions welcome. Rod

Re: Loose valve guide in block
 

the old fashioned "knurl" would work

Re: Loose valve guide in block
 

Another method is to have the guide copper plated, then use a reamer on the inside to bring it back to spec. The nice thing about copper is that it transfers heat well - away from the valve. But, since this is a tractor, probably not a big deal . . . I'd knurl it.