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post #1 of 6 Old 06-23-2012 Thread Starter
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Yanmar 2QM15 Decompression Lever?

So I have looked for the reason for the decompression lever on the Yanmar, and the previous owner disconnected the pull cable. What is the reason to use the decom lever and what is the proper use of it? I have heard everything from purging water to helping start the motor...the owners manual doesn't help much either...any experts out there? I'm new at this!
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post #2 of 6 Old 06-23-2012
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Re: Yanmar 2QM15 Decompression Lever?

because diesel engines have a lot of compression its easier on the starter and battery to get the engine spinning freely [heavy flywheel]then release the decompression lever for the engine start
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post #3 of 6 Old 06-23-2012
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Yanmar 2QM15 Decompression Lever?

You also need to use it to hand crank the engine. If your battery I too weak to turn over the engine, you can open the decomp. lever, spin the engine up, then close it to start the engine.
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Re: Yanmar 2QM15 Decompression Lever?

Thanks guys...makes sense!
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post #5 of 6 Old 06-23-2012
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Re: Yanmar 2QM15 Decompression Lever?

If your battery is weak or it is a very cold morning, open the decomp lever and get her spinning and then close it and she should start.
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Re: Yanmar 2QM15 Decompression Lever?

The thing about purging water applys more to larger engines...If you have a jacket water leak it can fill the combustion chamber...Water doesn't compress well and when the piston can't go up any more you can damage other components..
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