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Old 31-01-2019, 08:43   #61
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Re: Yanmar 2QM20 - Should I rebuild or replace it? Maybe convert to electric?

Most diesel engines are VERY simple...be brave and have a go at it..get a manual and study up and you will be surprised at how much you learn and how much mechanics charge for BS
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Old 31-01-2019, 09:20   #62
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Re: Yanmar 2QM20 - Should I rebuild or replace it? Maybe convert to electric?

Inspect the pistons carefully for hairline cracks around the ring grooves.
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Old 01-04-2019, 14:02   #63
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Re: Yanmar 2QM20 - Should I rebuild or replace it? Maybe convert to electric?

Quote:
Originally Posted by pwilletts View Post
Most diesel engines are VERY simple...be brave and have a go at it..get a manual and study up and you will be surprised at how much you learn and how much mechanics charge for BS
Thank you, that is what we have done and we are moving along!! updates on the engine refit here: https://doctorsailboat.com/2018-07-t...-yanmar-2qm20/
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Old 10-05-2019, 07:15   #64
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Re: Yanmar 2QM20 - Should I rebuild or replace it? Maybe convert to electric?

We continue to make progress on our yanmar refit project. Details here: https://doctorsailboat.com/2018-07-t...-yanmar-2qm20/
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Old 10-05-2019, 16:50   #65
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Re: Yanmar 2QM20 - Should I rebuild or replace it? Maybe convert to electric?

Looking good! But you don't say in your blog what any tolerances were. I'm just curious to see how worn it actually was both in liner region & crankshaft main bearing area. Or did you not worry about the tolerances & replace anyway?
With your approach you should end up with a "better than new" engine. When I say better than new I mean longer lasting than the newer engines as yours is heavier & lower revving.
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