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Old 09-08-2009, 13:35   #1
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Yanmar Compression Guage

Has anyone tested compression on a Yanmar 2GM? Do I need to buy the special Yanmar adaptar ($$$$) or can I use a standard, cheap adaptar?

Thanks!
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Old 09-08-2009, 14:55   #2
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If it fits the port, I think any gauge will work.
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Old 09-08-2009, 16:03   #3
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What do you mean by a standard cheap adapter?
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Old 09-08-2009, 16:36   #4
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Standard adaptar, meaning the types that come in a diesel compression guage kit.
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Old 09-08-2009, 16:43   #5
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Assumng yours is meant for a diesel engine and not a gas engine. As long as it fits, seals and it can withstand the presures of a diesel I don't see why not. I had to make mine from an old injector.
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Old 09-08-2009, 16:59   #6
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Injectors come in many shapes and sizes.....I made mine from an old injector (Yanmar)...the company that makes the kit....is going to send me an adapter they have developed for Free....The problem with Yanmars is the base is different for the variety of engines they make.

BTW leave the other injector in, but loosened, before you do the test. If you take it out, you may "launch" the precombustion chamber out of the engine.....and it do come out with some force.

For that piece of advice you may send a certified check in the amount of $80.00 to>>>>>or you can use PAYPAL.
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Old 09-08-2009, 17:04   #7
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Quote:
Originally Posted by Chief Engineer View Post
Injectors come in many shapes and sizes.....I made mine from an old injector (Yanmar)...the company that makes the kit....is going to send me an adapter they have developed for Free....The problem with Yanmars is the base is different for the variety of engines they make.

BTW leave the other injector in, but loosened, before you do the test. If you take it out, you may "launch" the precombustion chamber out of the engine.....and it do come out with some force.

For that piece of advice you may send a certified check in the amount of $80.00 to>>>>>or you can use PAYPAL.

LOL, that's worth the price of avoiding a serious knot on the head.
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Old 09-08-2009, 17:21   #8
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Thanks for the advice! I'll give that a try.
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Old 10-08-2009, 18:39   #9
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I have the 3GM30. most of the stuff is the same size. I had to buy a blank injector and bolt it back in then connect a compression gauge to that. The injector is not screwed in to the head. It is held in by two bolts on top with a copper washer in the bottom. Be sure to buy extra as they are easy to damage or loose. If you have a yanmar guy around it may be cheaper than buying all the stuff
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