I have a 1990 Westerbeke
(said to be based on a Perkins
4-154) with 1,370 total hours. The boat had very light use before I bought it 2 years ago, reportedly spending most of its time on the hard
in the Caribbean
and used only a few weeks a year and not at all during the last 3 years under the prior owner. It had 1,150 hours on it when I bought the boat.
More recently I had the injectors and the injector pump
rebuilt due to a small fuel
leak in the Bosch designed injector pump
Injector Pump 844 D814249, Bosch Pump No. 104640 0005). I had the yard do that work, with a good outside shop doing the injector and pump work.
During the first significant use of the engine
it sounded odd, which I initially attributed to the rebuilt injectors and so I keep going for about 10 minutes at 1,500-2,000 rpm
. Eventually when I take a look and find that the #2 injector line was loose and leaking fuel. Easy enough to tighten up.
However when we get going again and put it up to 2,200 rpm
black smoke and black water
is coming out the exhaust
. Throttle back to 1,200, and back to the yard after calling it for advice. Engine
seems fine with normal temperature, exhaust
First look at the engine at the yard shows coolant
accumulated under the engine and low coolant
level in the engine (down about 2 cups).
After about 45 minutes of study with the yard mechanic
while tied up to the dock
, when under load at 1,200 rpm and up, there is a small coolant leak at the head gasket
under the #1 cylinder. One drip every 10-20 seconds. No coolant leak or black smoke absent a load. Idles very smoothly and runs up to 2,200 rpm with no load. Engine oil
The somewhat embarrassed yard suggests no relationship and advises that the black smoke is due to loss of compression
at higher rpm. It advises that a new head gasket
is now required at significant expense.
I have had the engine oil analyzed every fall with no problems reported. Engine had run fine and had been very reliable.
Certainly there is a coincidence here and possible the misfiring #2 cylinder unsettled things within the engine. On the other hand a head gasket should stand up to external fuel leaks
This this just a latent problem that popped out by coincidence or is this a result of the loose injector line?