KEWA Manual © Copyright 2016
Page: 40
40
Mechanical
Yanmar 4LH-TE 105 HP Turbocharged Diesel Auxiliary
This engine provides a very nice amount of power for the boat, including being able to
drive the two high-output alternators. Yanmar has a good reputation and I’ve been very
pleased with the engine.
There are many suppliers for Yanmar parts. Pacwest out of San Diego is a distributor on
the West Coast, and, unfortunately, Yanmar forces you to use distributors in your local
area instead of whichever one you’d prefer. Mack Boring is good on the East Coast, and
carries additional items beyond Yanmar parts.
The factory installed a Volvo Penta cooling water strainer. It is well documented on the
HR Users Group on Yahoo that this strainer exhibits electrolysis in the metal fittings, and
this issue was observed in early 2008, so the unit was replaced in April of 2008 with a
very nice, all-plastic Vetus strainer (FTR330/32), with a custom metal mounting bracket.
I found corrosion caused by saltwater leaking from the small cooling water drain fitting
on the aft of the engine. The original fitting was not constructed of the proper materials
and got eaten away by electrolysis. The new Yanmar factory replacement part is of a
much higher brass construction.
A total of three Napa XL 25 9470 belts drive the 24v and 12v alternators, two for the 24V
and one for the 12v.
Cruising Range
At 174 gallons diesel capacity (excluding the 5-gallon jerry can of diesel kept in the bow
locker), and assuming an average speed of 6 knots and an average fuel consumption of
1.62 gallons/hour of operation (observed consumption with quite moderate genset use in
“normal” conditions (i.e., not motoring into heavy weather for hours on end)), the
approximate cruising range under auxiliary power is 644nm. Of course, you would never
want to get anywhere near running out of fuel, and conditions can often be less than ideal.
Modeling various scenarios including higher consumption, slower headway and a 25%
safety factor gives cruising ranges from 563nm to 326nm, with the 326nm scenario
assuming a quite conservative 2 gallons/hour, 5 knots of headway and a 25% safety
factor. The average of various scenarios that tend towards being conservative comes out
to an easy 450nm.
Hallberg-Rassy estimates consumption for the HR48 at 6 liters per hour under normal
conditions.
