>
> So I get the head off using the Rope Trick and I'm cleaning the old
> gasket off of it last night and I notice this nifty chunk missing out
> of the exhaust valve in the #6 chamber. Doh! as Homer would say. My
> compression leak wasn't the head gasket after all and now I'm looking
> at a head job :-(.
>
> I was wondering, is this something that "just happens" like s**t
> happens, or could I have done something to bring this on? As
> background, I keep the valves well adjusted, I use high enough octane
> gas and I've never revved this engine over 4,500 rpm. Any comments?
>
> Thanks,
> Jim
> jims@autodesk.com
> '74 TR6 CF20076U
>
>
>
Jim,
Normally, a valve breaks when conditions allow it so. The primary cause
would be maladjusted rockers, but since you hae paid close attention to
this area, generally you can rule it out.
So.... what's left.
Broken valve spring.
Worn rocker shaft.
Both of these create conditions condusive to breaking valves.
Another area to consider, since it is a side of the valve face that's
broken, would be valve guide, which would allow valve to wobble and break.
Remedy, suggest complete valvejob. ie; guides, springs valves. Check
rocker shaft closely for wear. Check pushrods for flattened or worn ends.
Check tappet on rockers for flattened or worn surface.
You can do a head yourself without too much hassle. If you would like to
consider it, I will gladly lead you through it. Only special tool
required would be seat cutter and lapper.
Best Regards,
Tony
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