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Topic-icon Engine dies when carb cleaner sprayed at cylinder base

  • jchussey
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9 months 1 week ago - 9 months 1 week ago #4167 by jchussey
In testing for vacuum leaks today, I noticed that if i spray the bottom of each cylinder base just above the push rod tube seals, the idle will drop. If I spray enough, I can make the engine die. Spraying the typical intake tract culprits ( elbow rubbers, intake spigot, end of butterfly shaft, etc) yields no change in idle. I'm guessing that the spray is entering the crankcase and being passed through the breather to to the carbs, but I don't have oil leaking at the cylinder bases, and have just completed a re-torque and valve adjustment. The pushrod tube seals are weeping, but not dripping.
Last edit: 9 months 1 week ago by jchussey. Reason: Added more info

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9 months 1 week ago - 9 months 1 week ago #4168 by Wobbly
The sump pressure created by 2 pistons coming together would surely push out oil if there was any type opening. I think you only have a happy coincidence.

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Last edit: 9 months 1 week ago by Wobbly.

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