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old guy :)
1,061 Posts
On our old boat we had a 2GM20F and loved it.

On our new boat, we have a 2QM20H raw water cooled engine, and other than being older it runs just as well. The PO wasn't the best on maintenance (bad news) but whomever he used for engine work was (good news). I replaced the zincs and everything (so far) that I have taken off (metal to metal) had had traces of "Never-seize" and has come apart easily.

One nice thing about the freshwater cooled (someone mentioned) is they run hotter - that translates into hotter water in hot water tank for the domestic water or hotter air in the hot water cabin heater.

The full engine repair manual and parts lists are online somewhere.

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