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Re: [xj-s] Cocked Valve Seat
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Re: [xj-s] Cocked Valve Seat



On Sat, 11 Jul 1998, Kirbert wrote:

> that isn't exactly what's happening.  Maybe several seats are loose 
> because the engine is running hot, but when the engine is shut off 
> they all are pulled back into place by the valves closing -- except 
> for the one or two that happen to be held open by the cam.  Those 
> stay dropped as the engine cools and tightens back down on them.  
> Then, when the engine is restarted, the valve closing tries to move 
> them, but they're tight now, so they jam and cock sideways.
> 
If this is  it, then there is a way to prevent it.  Wire a circuit that
spins the starter with no fuel or ignition a few times after a hot
shutdown over x degrees.  If you spun it randomly a few times, the odds
are that the same valves wouldn't be open.

Similar concepts:  letting a turbocharged car spool down before a hot
shutdown.  Really big turbines, that have auxiliary means of revolving the
shafts slowly after a hot shutdown so that gravity doesn't bend their
shafts (really!).

John

 

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