KSG416 (Bobcat 732) Engine valve guides

[spitzair]

Hello all, I’m in the middle of repairing the spare engine I have for my 732s and have run into a snag. The valves and guides are worn beyond tolerance and I can’t find new guides or oversize valves. Standard valves are no issue to find but this particular engine already has 0.003 oversize exhaust valves installed from what I can tell. The intakes are still standard size but are worn pretty bad... So I was hoping somebody here would have a source of either valve guides or oversize valves for this engine. If I can’t find any then I’ll either try to put standard intake valves in and re-use the exhaust valves as they’re nowhere near worn as bad as the intakes or failing that I’ll try to get a rebuilt head as they still seem to be available... I’ve managed to find all the other parts I need so far...

 

[craigb93]

Not a problem. The stems are (I think ) 11/16". Could be 5/16". Either way, any 'performance' engine shop will have tooling to bore the guides for a press-in or screw-in bronze insert that is then reamed to standard. K-Line is one brand, I forget the other one. I have used both and they will last a long time. The standard stem seals will still fit/work. Racers use them to deliberately tighten the stem clearance for a precision valve seal with narrow seats. A much better route than replacement guides that often require lowering the seat to accommodate a new stem centerline. Best of luck. -Dick

 

[spitzair]

Not a problem. The stems are (I think ) 11/16". Could be 5/16". Either way, any 'performance' engine shop will have tooling to bore the guides for a press-in or screw-in bronze insert that is then reamed to standard. K-Line is one brand, I forget the other one. I have used both and they will last a long time. The standard stem seals will still fit/work. Racers use them to deliberately tighten the stem clearance for a precision valve seal with narrow seats. A much better route than replacement guides that often require lowering the seat to accommodate a new stem centerline. Best of luck. -Dick

That is awesome news! And most likely exactly what I’ll do! Thanks!

 

[Tazza]

That is awesome news! And most likely exactly what I’ll do! Thanks!

I was going to suggest k-line, they have been around a long time and have been proven to work very well.