Leakdown tester homemade engine cylinder troubleshooting tool
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| − | + | If you have an engine cylinder that is not as strong as the rest, and you have determined that it is getting spark, here's how to make a simple tool that may be able to locate the problem. | |
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| + | #Take an old spark plug that fits the engine, and remove all of the porcelain and the center electrode, leaving just the outer shell. | ||
| + | #Braze an air fitting onto the shell. | ||
| + | #Turn the engine over until the piston in the suspect cylinder is at TDC on the compression stroke. | ||
| + | #Insert the modified plug and apply 60-80 psi air to the cylinder. Be certain not to use so much air that it turns the engine. | ||
| + | #With air pressure in the cylinder, listen: | ||
| + | **If you hear air bubbles, it may be a leaking head gasket. | ||
| + | **If you hear air in the exhaust, it may be a leaking exhaust valve. | ||
| + | **If you hear air coming up through the carb, it may be a leaking intake valve. | ||
| + | **If you hear a hissing noise from the oil fill tube, or the dipstick tube, it may be a piston or piston ring problem. | ||
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| + | This simple homemade device can save a lot of time in diagnosing a problem. | ||
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