The Craftmans Shop > PowerSports
1954 Ford 850 Tractor w/blown Head Gasket (at the very least)
vtsteam:
(just broke 2000 posts here today) :beer: to all!
:nrocks: :nrocks:
RussellT:
You can't leave us hanging there just when it's getting exciting. :D
It's looking good.
awemawson:
Steve it's looking good :thumbup:
Presumably the 3 thou clearance to the valve spring retaining collets is just a minimum - I can't see that 10 thou more would make a jot of a difference as the cap just needs not to be resting on the collet, but only contacting the end of the valve stem.
Looking forward to seeing it running :wave:
vtsteam:
RussellT sorry about that -- it was supper time and I had to cover the tractor up with rain threatening and put away the tools manuals etc. that I had scattered about!
Andrew it's the other way round -- the clearance is to the head of the valve stem. The cap rests on the valve lock/retainer, not the valve stem. When the rocker arm comes down it depresses the spring (through the retainer) in advance of contacting the valve stem head. This presumably frees the valve and allows it to rotate. the delay is short since the spec calls for .002" to .004" total clearance. What I found was .020" - .050". In other words the caps were too long, not too short (probably as received, rather than fitted). This would have added a fair amount to the normal valve lash of .014" - .016".
awemawson:
Well you learn something every day !
Never come across that set up before, and I've pulled the odd engine apart in my time :scratch:
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