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Old 26-10-2017, 08:48   #1
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Yanmar 2GM20F

I am currently in a refitting of a '72 Pearson 33 and the the did sink 5/6 years ago BUT engine was torn down a flushed/repainted. I understand it was running but doubt it ran in 5 years. I hit the decompression levers and it freely turns.

I am looking for advice in advance of taking this next project. What is the general cost to rebuild this engine? I know if it needs bearings, rings etc it could be even more expensive. How about rebuild kits?? Any advice would be great!

Thanks!!
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Old 26-10-2017, 09:02   #2
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Re: Yanmar 2GM20F

If you provide the labor, rings, bearings and major gaskets, etc will run $500 ish for parts. Add $140 per injector and extra for engine mounts ($150 ea) Alternator, pumps starter etc. I rebuild my 3gm30F with machining for $1200, including $300 for two new engine mounts and $300 for sleeving one hole and honing the other two. That was in 2013.

Oversize pistons are available and run $150 ish ea.

However, I would bleed the engine. crank it for 20 second with the decompression levers pulled (close the raw water intake first) to distribute oil to te bearings and then see if it starts.

If it starts easy when cold it's most likely ok.

when I tore my yanmar down with 1100 hours on the clock there was zero wear on rings and bearings. That is they all mic'ed within new tolorance. Alas I had a 1994 engine and the 94 year engine had a batch of pistons with weak piston lands.

With over 600 hours on the rebuild, my engine is still going strong.
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Old 26-10-2017, 09:16   #3
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Re: Yanmar 2GM20F

Thank you for all this info sailorchic!!!
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Old 26-10-2017, 13:11   #4
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Re: Yanmar 2GM20F

I recently replaced my 2GMF (that span a bearing) with a 2GM20f. Pretty much all the parts from the old 2GMF are available. If you decide to rebuild just let me know if you need any parts (fuel pump, heat exchanger, injectors, etc.).

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Old 26-10-2017, 20:12   #5
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Re: Yanmar 2GM20F

Take out the injectors and spray fogging oil for 5 seconds into each port. Then turn the engine over by hand for a few revolutions, to coat the cylinder walls with oil. Put the injectors back in and try to start the engine.
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