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Old 25-04-2011, 18:18   #1
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Leakdown Tester for Yanmar

I've done some searches for clyinder leakdown tester and came up w/ some links. I did indecate diesel engine and wasn't sure what could be used on the Yanmar. One site indecated "for all GM, Isuzu, ect...the engine is a 3GM30. would the "for all GM apply to this Yanmar??
If you guys could direct me to the proper compression/leakdown tester it would be greatly appriciated. I am not certain the 2 are even the same. Thanks, David
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Old 25-04-2011, 18:25   #2
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Re: leakdown tester for Yanmar

In view of the context (all Gm, Isuzu...) I think that in this case GM is the General Motors brand not a model name from Yanmar...
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Old 25-04-2011, 19:06   #3
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Re: leakdown tester for Yanmar

The difference between the compression tester and a leak down tester is the compression tester one uses with the motor being cranked over and has one gauge, which tells one the cylinder pressure.

A leak-down tester has two gauges. With the motor piston in different positions in the cylinder one can check to see if the cylinder is warped or has other wear. As well, the valves could be leaking instead.
One pumps air into the cylinder up to certain pressures and the second gauge will tell you how long the air stays in the cylinder, to put it in simple terms.

You'll need an adapter for the injector hole for your motor what ever gauge you use.

If air is leaking out your exhaust/intake, it's valves. if air is leaking into the crank case then it's pistons/cylinders. Leaking anywhere else, its a gasket (check the cooling system).
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Old 25-04-2011, 19:10   #4
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Re: leakdown tester for Yanmar

There is a thread on this forum that discussed the difficulty on finding an adapter for Yanmar engines. Someone made one out of an old injector, but I don't remember the details.
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Old 25-04-2011, 20:35   #5
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Re: leakdown tester for Yanmar

The company that made my diesel compression Tester (From Mac Tools) doesn't make one for Yanmar.....I just bult adapters from old Yanmar injectors.....the holes are not all the same for different engines
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Old 25-04-2011, 20:36   #6
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Re: leakdown tester for Yanmar

GM is General Motors
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