[Healeys] Keeping a Healey, and a hissing oil filler cap

[Oudesluys]

  Increased crankcase pressure! This should not happen as there should 
be some form of crank case ventilation present.
Increased crankcase pressure is generally caused by excessive piston 
blow by, which means worn piston rings, pistons or bores or all three of 
them. Does it burn oil, i.e. blue smoke?
You do not mention oil leaks from the rear crank seal. I wonder if this 
has been modified in the past to accept a modern seal instead of the 
more or less open spiral "seal". This could also be the problem as now 
there will be less opportunity to get rid of the blow by gases. If this 
is the case you have to increase the crankcase ventilation.
Kees Oudesluijs
NL

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