Your senses will tell you: Is it original paint on the motor and clean, fluids healthy, no or tiny smoke, good water flow, sounds like a diesel.Ĭoncluding that it's nearly impossible to wear out an auxiliary diesel in sailboats, with a well-maintained motor predicted for a 20k hour wear life, if it looks good and sounds good, it is good.
Not absolute, but that care likely included the motor. You can readily see if it has been cared for. 2) Loosen the bleed screw at the input to the high pressure fuel pump. Operate the lift pump (electrical or manual) and watch for just fuel (no bubbles or air) exiting the bleed screw.
Rebuilding a yanmar 8 hp marine engine how to#
You can get a vibe of the overall aura of the boat. 1) Loosen the bleed screw on the top of the fuel filter. Yanmar Engine Fix, Part 1Yanmar 6EY22 Marine Diesel Engine Maintenance 1 Yanmar 6EY22 Marine Diesel Engine Maintenance Manual cylinder head detaching How to Winterize a Yanmar Marine Diesel Engine Yanmar YSE 8hp running Rebuilt Yanmar 8hp 1GM10 shop run Changchai 12 HP Chinese diesel engine Yanmar 6EY22. And I've only seen maybe 2 or 3 of those. In all my years of looking at sailboats and sailboats for sale, thousands, I've never seen a motor with more than 6,000 hours on it. If I've got 5k for refurbishing a 35 year old motor, boy-howdy I've got $8k for a brand new motor instead.
Maybe doesn't need a rebuild in the true sense, but a refurbish.
Add to your above list: seeping gaskets, bad injectors, corroded bell housing/thermostat housing/other aluminum bits, carbon in the head, rusted through pan, etc. Age can kill a motor just as dead as wear.
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