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Testing for Vacume Leaks
When assembling a new engine or working on a running engine with problems, is there a way to effectively test for vacume leaks on an assembled engine. Could you close the valves and block off the carb flange and use a leakdown tester? If so how would that work? Is it reasonable to expect it to hold a vacume before it's run or does it have to go through some heating cooling cycles first?
Thanks, Chuck |
The "classic" method for checking is a piece of fuel line - one end held to the ear, the other probing likely leak spots. Nowadays, we're much more sophisticated :D . We use an unlit propane torch blowing around likely spots. When the idle changes, you've found the spot.
Hopefully. |
Seems like a good way to do it.
I had heard the propane trick on another forum too. I wonder if it would find a leak underneath like in the lifter valley side? Anyway, thanks for the tip.
Chuck |
Like the propane technique, I've used a spray can of starting fluid and listen for increase in RPM.
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