> > My friend's TR6 is consuming oil. In addition, the #5 spark plug fouls
> > regularly and needs to be cleaned or replaced to run smoothly again. I am
> > guessing these two issues might be related... The oil fouling the plug...
> > If that is the case, what is the most likely route for the oil problem?
> > From the cylinder head? Or from the rings?
Unfortunately, the most likely explanation IMO is damage to the cylinder wall
or piston. Might be just a broken ring, or badly worn valve guide, though.
Rather than mess with a compression test (which can sometimes be misleading), I
would go ahead and pull the head to check the valve. Your friend knows he has
a problem, and he will need to pull the head anyway, even if the problem is
rings/piston/cylinder wall. And it's worth checking the valves when the head
is off even if they aren't the primary problem.
Randall
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