Yanmar 4lha-ste 2005 ca 500 uur.

Te koop zonder keerkoppeling. Motorblok zit momenteel nog in de boot en gaat er over een paar maandjes uit.

Heeft slechts ca500 uur gedraaid en verkeerd in zeer goede
Conditie.

Yanmar 4LHA-STP marine diesel engine is the biggest four-cylinder diesel in the Yanmar engines recreational inboard range. It’s the most powerful of a trio of marine diesel engines from 158 to 237bhp that suit semi-displacement cruisers up to 11m as singles, and up to 13m as twins.

Like other large-displacement fours such as the Beta 90, the direct-injection 4LHA range has mechanical fuel-injection and scores its power increase through turbocharging and intercooling.

The mechanical aspect makes sense since there are many old farts like me out there who prefer this type of engine control. Sure, electronic engine management reduces exhaust emissions and allows for real-time fuel flow and range-to-empty meters but in remote areas a mechanical engine is easier to repair than an electronic unit.



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Electronic engine management on the Yanmar 4LHA-STP marine diesel reduces exhaust emissions. However
ENGINE REVIEW - YANMAR 4LHA-STP

The Yanmar 4LHA-STP marine diesel engine is the biggest four-cylinder diesel in the Yanmar engines recreational inboard range. It’s the most powerful of a trio of marine diesel engines from 158 to 237bhp that suit semi-displacement cruisers up to 11m as singles, and up to 13m as twins.

Like other large-displacement fours such as the Beta 90, the direct-injection 4LHA range has mechanical fuel-injection and scores its power increase through turbocharging and intercooling.

The mechanical aspect makes sense since there are many old farts like me out there who prefer this type of engine control. Sure, electronic engine management reduces exhaust emissions and allows for real-time fuel flow and range-to-empty meters but in remote areas a mechanical engine is easier to repair than an electronic unit.


This is why mechanically injected engines from John Deere are popular in long-range trawler yachts. But these are heavy, achieve maximum output at much lower revs and are intended for full displacement hulls, not semi-displacement cruisers.



Yanmar 4LHA-STP marine diesel

Compared to Yanmar’s 311bhp 6LPA-STP2 marine diesel, originating from the Toyota Land Cruiser 4.2-litre straight six, the 4LHA-STP was specifically designed as a marine engine. Yanmar didn’t opt for a belt-driven overhead camshaft as with the six and stayed with two valves per cylinder instead of four. Way simpler when it comes to checking valve clearances.

For its output the STP is a fairly high-revving engine, though not as high as the six. Sensibly, the piston stroke isn’t much greater than the cylinder bore so piston speeds won’t be excessive. And Yanmar has kept a reliable OHV design with gear-driven pushrods plus a cast-iron cylinder block and head, even though freshwater (heat exchanger) cooling is standard. Just as well since few owners would want the drag of keel cooling pipes in a semi-displacement hull.

A high-mounted and voltage-regulated 80-amp alternator is standard but this is bit light for powering comprehensive on-board electronics. The 2kW starter motor is mounted above the engine bearers and away from bilge water, though a well-maintained boat should never have more than a puddle in the bilge.