Which Yanmar Engine to Repower

[MissTeak]

My 18 year old Yanmar 4Jh2E (53HP) with 4200 hours is blowing a good deal of exhaust out the oil fill hole and there is a “sheen” in the water when I start it up. For the most part, engine runs smoothly, uses no oil and starts immediately every time – there is a slight vibration at higher RPM’s (2650) and a “different” sound – this could be nothing more than my own paranoia... Last Spring I had an oil cooler fail and filled the engine with salt water (2nd time this has happened). I replaced the oil cooler, flushed the engine with diesel and multiple gallons of oil in a remote part of Mexico (very fun…). On my way back to California from Mexico, the engine developed an oil leak on the front main seal. When changing this I discovered the front pulley had a great deal of rust on the portion that is inside the seal. I replaced the pulley (too pitted to reuse) along with the seal – all is good now. But, it seems, the engine is on its way out and I don’t want to deal with this in an unplanned “we have a situation” way. In researching choices I’m not sure if I should replace with the Yanmar 4JH5E (53HP) or the 4JH4-TE (75HP). Doing the hull speed and “Gross Weight/500 LBS” calculations puts me at needing 62HP. There isn’t much weight difference between the engines and the fuel economy would be about the same according to the research. Not real excited about having the turbo (heat and TLC needed) however I’m sort of drawn to the added HP for coming north bound trips from Mexico. I would greatly appreciate any thoughts/comments. Thank you

[Cotemar]

I would go with the Yanmar 75hp also, until you said it has a turbo charger.
It will increase your maintenance. Turbo chargers on a marine engine is just a no no.

A Beta Marine 75hp does not have a turbo charger and for good reason, it’s not needed.

[Vasco]

I would rebuild the 2E. Or get the 5E. Definitely not the turbo.

[djmarchand]

Turbos aren't necessarily bad. They will run for thousands of hours and usually last as long as the engine. The only thing you have to be careful about is getting water backed up into the turbo and then possibly into your engine.

The 75 hp Yanmar is turbocharged but not intercooled. Intercooling does add some maintenance or if the maintenance is not done, then serious longevity issues.

So I would not be afraid of the turbo. But the Beta 75 hp is a nice engine.

David

[MissTeak]

Settled on the 4jh5e based on calculations and space. Anyone know if some of my 4jh2e parts will work on the 5e (for spares). Specifically, fresh water pump, alternator, tach sending unit, oil cooler and raw waster impellers?

[ericsbr]

Do you still have any parts from your old 4jh2e? I'm rebuilding one and may need some parts.

Thanks
Eric