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marinesniper 12-28-2006 12:36 AM

Yanmar 2GM or 2QM15...?

I have been trying to learn everything about my engine in the hopes to be able to perform all the maint work on it myself.


I purchased the service manual for the 2GM and 2QM15 engine.

In the manual the pictures and the layout of the 2GM match my engine perfectly, but the engine marking clearly says it is a 2QM15. ???

The 2 engine designs are very different, I am positive that my engine design matched the schematics in the manual for the 2GM yet it is stamped on the side of the engine as an 2QM15...

Anyone have any was built in 1977-1983 time frame...


Goodnewsboy 12-28-2006 12:52 AM

If you have a 2GM, I would contact Torresen's and get the Yanmar factory manual (AOA1025). It is specific to the GM family (1GM, 2GM, 3GM and 3HM). The aftermarket manuals are inferior.

If you have any doubt about which engine you have, they can help.

They also have complete parts lists for these engines online.

I have a 1982 2GM with a SenDure heat exchanger kit and it's a great engine if 13 HP is enough for you. We have it in a C&C 30 and it does a very fine job of getting her up to hull speed without straining. One thing that few seem to know is that it has dry cylinder sleeves, so you can simply replace them at overhaul time, avoiding the hassle of boring and selecting oversize pistons.

marinesniper 01-02-2007 10:38 PM

well the mech confirmed it is an Yanmar 2GM but labled as and 2QM15 and he does not know why... :)

My starting problems are due to a faulty Fuel lifter...! ordered and on its way...!

Goodnewsboy 01-03-2007 11:10 PM

The 2GM is a wonderful little engine. Better than the later model 2GM20 in my opinion.

You should still get the Yanmar service manual.

marinesniper 01-05-2007 11:25 AM


The Solec manual appears wrong. This is what the Yanmar service guy tells me. My engine is a 2QM15 but the picture in the Solec manual does not match the design.

So far we have found a siezed water pump (replaced), Bad Fuel lifter (replaced), and finally (hopefully the last) the injector pump is only feeding fuel to on of the injectors. THe mech says it needs to be recalibrated...

Total cost so far:

Fuel lifter = $200.00
Water pump = $ 80.00
Labor @65/ 7 hours = $455.00

The key thing is I watched everything he did and learned how to diagnose this type of problem in case of future re-occurance.

Hopefully after today I will be on my way to Key Largo...(10 hr run from Miami)

Goodnewsboy 01-05-2007 07:45 PM

The pump is adjusted by shims if it is anything like the 2GM.

It is actuated by a camshaft and the shims vary the injection timing by moving the pump body, and hence the follower closer to, or farther away, from the cam.

This thread shows one reason why the Yanmar service manual is worth the money.

ariel7x 10-21-2008 04:38 PM

If the shifter is on the port side its a gm, on the stbd its a qm

NOLAsailing 10-21-2008 04:55 PM

tommays 10-21-2008 05:12 PM
The only good place to use and aftermarket manual

NOLAsailing 10-21-2008 05:50 PM

In response to Tommay's post, note that the manuals I linked to above are not aftermarket. Just clarifying. :)

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