Finding vacuum leaks
(→Carburetor cleaner method) |
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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 [[Manifold/Head vacuum leak, internal]]. | ||
| − | + | ==Propane method== | |
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| − | =Propane method= | + | |
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#Get a soldering propane tank and valve attachment. | #Get a soldering propane tank and valve attachment. | ||
| − | #Unscrew the end of it so you have a threaded pipe without the nozzle. | + | #Unscrew the end of it so that you have a threaded pipe without the nozzle. |
| − | #Attach a 2 foot piece of hose to the end. | + | #Attach a 2-foot piece of hose to the end. |
#Start the engine and let it warm up a bit. | #Start the engine and let it warm up a bit. | ||
#Turn on the propane and run the hose all around the vacuum lines and the bottom of the carb. | #Turn on the propane and run the hose all around the vacuum lines and the bottom of the carb. | ||
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Hold bottle UPRIGHT during testing as liquid propane may run out of an inverted bottle. | Hold bottle UPRIGHT during testing as liquid propane may run out of an inverted bottle. | ||
| − | PLEASE do this in a well ventilated area due to propane gas and exhaust fumes! | + | PLEASE do this in a well ventilated area due to propane gas and exhaust fumes! |
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| − | =Carburetor cleaner method= | + | ==Carburetor cleaner method== |
#With the car running, using a can of carburetor cleaner spray down the hoses and vacuum connections. | #With the car running, using a can of carburetor cleaner spray down the hoses and vacuum connections. | ||
#Notice a change in the running of the engine and you might have found your leak. | #Notice a change in the running of the engine and you might have found your leak. | ||
| − | ==Note== | + | ===Note=== |
You may also use engine startup fluid instead, as it is not caustic like carb cleaner, and does not leave residue. | You may also use engine startup fluid instead, as it is not caustic like carb cleaner, and does not leave residue. | ||
[[Category:Engine]] | [[Category:Engine]] | ||
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