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Steps in the diagnoses: Pull The cap off, Is the rotor tight or will it twist side to side where it mounts to the shaft. When you Twist the rotor does the mechanical advance weights allow it to move and then spring back imediatly? If the rotor moves back and forth with out resistance and doesnt spring back it has broken or missing advance weight springs. Next rotate the the crank with a wrench or socket and watch the rotor doese it move with very little play or does it allow the crank to move 10 degrees before it moves. There will be some slop. But does the amount corispaond to your error? If this is the fault it could be: Timing chain or Distributor drive gears (Camshaft and oil pump/distributor drive) To fix change the timing set and/or cam set. I usualy use a fresh chain set with every cam cause they are cheap and I have to do the work any way. It is very likly that the distributor/oil pump drive gear wern't changed the last time this was overhauled. I check it when I have an engine torn down. But that bit me on my race car recently. Getting metal on the oil samples and it was the old ger eating itself. Cost me a tear down and cam set. Good Luck |
RV and bus conversion info since 1996.
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