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Old 20-10-2016, 17:06   #1
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Yanmar Gm and HM shop manual? Will it work for QM

So I have a 3qm30 on the boat. Found a nice gm and hm shop manual online.
Are these close enough for me to cross reference?
Worked on atomic's and universal's. Never a yanmar.
Also have the newest Nigel Calder books on Diesel.
So that should help.
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Old 20-10-2016, 17:25   #2
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Re: Yanmar Gm and HM shop manual? Will it work for QM

The GM is a newer version but very similar to the QM. Differences would be in the governor, QM has rocker towers, where GM has a rocker bar. Both pushrod diesels, so the GM will be a fair guide to the QM as to remove and replace. Same basic engine design.

The QM is in my mind the better engine, with sleeved cylinders, lower peak RPM and generally heavier construction. Parts are becoming an issue, but rebuilding pumps and starters, injectors are done all the time. It should run a long time.

Of course changing the bearings in the water pump">raw water pump (easy) and water pump (less easy- needs a press) and replacing the discharge elbow would go a long way to reducing surprises.

Best of luck with the QM.
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Old 20-10-2016, 17:34   #3
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Re: Yanmar Gm and HM shop manual? Will it work for QM

I have a Yanmar 2QM20 and it has the same manual as the 3QM30. Here's the link:

Boatinfo - Yanmar Operator Manual for 2QM20
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Old 20-10-2016, 19:35   #4
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Re: Yanmar Gm and HM shop manual? Will it work for QM

Thx sailorchic34! Sounds like you have been around an engine block or three. Thx for the tips
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Old 25-10-2016, 16:10   #5
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Re: Yanmar Gm and HM shop manual? Will it work for QM

Thx JRNASH. Perfect
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