Finding vacuum leaks

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There are several methods for locating vacuum leaks. Occasionally, you may experience a vacuum leak into the intake ports from the crankcase of the motor due to the intake manifold / cylinder head interface not being machined parallel. No amount of propane or carburetor cleaner will find such a leak. The best way is to insure the elimination of such a problem while building the engine. See the wiki article: [[Manifold/Head vacuum leak, internal]].
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=Propane method=
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#Get a soldering propane tank and valve attachment.
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#Unscrew the end of it so you have a threaded pipe without the nozzle.
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#Attach a 2 foot piece of hose to the end.
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#Start the engine and let it warm up a bit.
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#Turn on the propane and run the hose all around the vacuum lines and the bottom of the carb.
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#If the engine smooths out or revs up a bit, you have found your leak.
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Hold bottle UPRIGHT during testing as liquid propane may run out of an inverted bottle.
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PLEASE do this in a well ventilated area due to propane gas and exhaust fumes!!
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Fixing a leak. My old neighbor built circle track cars and after the ran the engine  he would shut it off...tape off every opening with duct tape then put a hose over the dip stick and hook up to a vacuum source. He would then get his stethascope and listen in the area where the propane or carb fluid indicated a leak. he used Rtv and calked into the area until the stethascope whistle stopped. too much vacuum will pull too much calk into the hole.
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=Carburetor cleaner method=
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#With the car running, using a can of carburetor cleaner spray down the hoses and vacuum connections.
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#Notice a change in the running of the engine and you might have found your leak.
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[[Category:Engine]]
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Revision as of 21:57, 7 July 2009

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