I have a 1987 spider with an oil leak out of the oil cap. I have bent the
tabs on the cap to tighten it----
Your problem isn't the oil cap, you have something pressurizing the
crankcase. There is blow by past the rings that enters the crankcase and if
it is not vented, it will build up pressure and when it gets high enough it
will escape. Usually around the filler cap or up the dipstick tube but never
the oil filter. The oil filter runs at 50 psi or better so to pressurize the
crankcase enough to blow it would take hundreds of psi. By then every seal on
the engine would be in the driveway! If somebody's oil filter blew it was
either defective or the pressure relief valve in the oil pump stuck.
Your problem is most likely a clogged oil separator or the lines going to
it. One larger line coming from the valve cover and one larger line going to
the intake plenum. You should be able to blow thru them with no resistance
including blowing thru the separator.
Also check the little drain line coming off the bottom and drains the oil back
into the crankcase. That is probably full of oil but you should be able to
blow thru it as well. Cleaning that separator is a beggar!! It's a sealed
unit and the only way to get it clean is time and solvent. Lots of both.
Lastly, don't run any "Mouse Milk" thru the crankcase, especially if you
are planning to run the engine with it in there. I did that once back in the
'50's on a '54 Ford. Used jet fuel. Cut the carbon and the rear seal better
than a lathe. Ruined the crankshaft and caused me to replace the engine.
Like I said, don't do that ;-) Good quality oil has cleaners enough in it so
if you change the oil regularly, that should be all you need to keep the
carbon down.
Skip Patnode,
'67 Duetto
Norfolk, Va
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