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What Is A Leak Down Test???

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Old 05-31-2006, 11:55 AM
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Default What Is A Leak Down Test???

Can someone tell me what a leakdown test is and what the benefits are. What is the difference between a leakdown test and a compression test?? Sorry for my ignorance. Any offshorers out there that can inform me? Thanks!!
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Old 05-31-2006, 01:56 PM
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Default Re: What Is A Leak Down Test???

A leakdown tester is a where the each cylinder is pressurized with air 100+ lbs. The engine is not running and a strong person holds a breaker bar on the crank. The measured rate of air going past rings and valves at TDC will tell you the condition of an engine. By far a better test than simple compression. It is the only way to test a two stroke. I have seen 2 stroke engines with good compression, but a lot of leakdown that ran like garbage they were so worn out. The unit is not that expensive. Requires an air compressor source.
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Old 05-31-2006, 02:24 PM
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Default Re: What Is A Leak Down Test???

also can tell you if you have any problem in the valve train(burn valve or carbon deposit) as well as a good pin point to blow head gasket diagnostic, just my $0.02
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Old 05-31-2006, 02:51 PM
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Default Re: What Is A Leak Down Test???

Quote:
Originally Posted by orss
also can tell you if you have any problem in the valve train(burn valve or carbon deposit) as well as a good pin point to blow head gasket diagnostic, just my $0.02
Have really had no problems, I just want to get a more accurate picture of the engine longevity wise. Also, I fear I may be losing a little power (502 mag mpi). I just took it to the dealer and told them to see whats-what... I had a compression check when I bought the boat but not a leakdown test and wanted to see the results...
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Old 05-31-2006, 03:20 PM
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Default Re: What Is A Leak Down Test???

We just had one done on the TG...it was a good idea.
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