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I have a 1989 Supra that has started to leak oil from the distributor. I heard that there was no rebuild kit, only replacement. I went to my local junkyard and found a replacement unit and installed it.
About 2 days after installing the distributor, it has started to leak once again. There is also some oil inside the throttle body. Can this be from engine back pressure and it has blown the distributor seal? I can't figure out what is causing this situation.
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Did you put a new O-Ring seal on the distributor before installing it, if not try doing that first.
It's not leaking externally (I did put a new seal though),but internally and the oil is draining from the drain hole in the distributor. Can you tell me what would cause excessive back pressure?
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Excessive crankcase pressure can be caused by excessive blowby by worn piston rings, it can also be caused by a restriction in the Positive Crankcase Ventilation(PCV) system, you can try replacing the pcv valve and check that the breather hose is not obstructed, the pcv system is designed to introduce any blowby gases back into the intake system, this is why there are deposits in the throttle body, there is either a restriction in the pcv system causing the excess pressure or the piston rings are worn to the point where there is pressure building up in the crankcase to such an extend that the pcv system can not handle it and dumps most of the gases and oil back into the intake system.
I have the repair manual and it doesn't show a "PVC Valve". There only seems to have hoses connecting from the valve cover to the throttle body. Where is the PVC valve?
What is the best way to check the condition of the rings?
From what you said about blowby, this is probably why the internal seal of the distributor is leaking. Is this somewhat of a common problem, blowby?
AnswerI stand corrected, the supra of that year doesn't use a PCV valve, blowby gases are redirected into the intake system to reduce emissions.
Make sure that none of the hoses are clogged or otherwise restricted, excessive blowby gases are caused by worn piston rings, the best way to check for this condition is to do and engine compression test and even better a cylinder leak down test, any decent repair shop or the dealer should be able to do this.
