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Stella Blue Pictures |
8kw Diesel Kohler Genset (Model
8EOZ)
Stella Blue is fitted with the 8 Kw Kohler genset. This unit
has been a reliable performer, with no issues as of the date of this
writing (4th season).
Mainship has been much maligned by some
owners for the difficulty in performing service to the unit because of the
installation of the sound shield which results in difficult access to
some important service points. The genset sound shield is a wonderful
improvement over previous installations without it, in terms of lower
noise levels. The problem is, it makes changing upper hoses, valve
adjustments, tensioning the alternator belt, and a host of other
maintenance items very difficult.
In recent conversation with Mainship's General Manager Jim
Krueger, he explained the sound shield was developed in response to
suggestions from 390 owners, during the design phases of the 400. A
soft shield had been fitted on some of the later 390's, but some
improvement was in order. Mainship worked with Kohler to develop a
system that would dramatically reduce sound levels while keeping the unit
"user friendly" in terms of periodic maintenance. The rigid sound shield
does just that.
Four hatches with quick opening latches, one on
each side, and a removable top section, allow great access to all
sides of the unit. The problem comes when you put the whole system in,
under the cockpit deck, and up against the aft bulkhead. The top cover no
longer becomes removable due to the lack of overhead space to remove the
screws.
During the commissioning process, my dealer removed the
cover by pulling the genset from it's normal position under the deck,
to the hatch opening. For some reason not explained to me at the time,
they needed to service something on top of the engine and removed the
cover to do so. In their infinate wisdom, they left the cover off so
that same maintenance could be done in the future without pulling the
genset. When I discovered this the following season, and asked about the
cover, it was too late. They had already lost the cover and would not
replace it. There is enough room to slide the cover into place and use
some stiff foam blocks to hold it in place rather that fight
with the screws. So now I have all the disadvantages of the sound shield
with out the benefits of noise reduction! Real smart thinking
there.
The other access problem is the side up against the aft
bulkhead. It is nearly impossible for a normal sized person to crawl from
the cockpit hatch area, around to the opposite side of the
unit. Removing the battery and seawater stainer would help, but is a
lot of extra work just to tighten an alternator belt for example.
Any repairs in those areas, like
changing a starter, alternator, an upper coolant hose, or such, will
likely demand that the unit be extracted from it's position.
This is where the complaints come in. The installation does not
permit easy extraction of the unit. The screws that hold the unit in
place are inside the already cramped cabinet, making a bad situation worse
or more difficult. This could have been better thought out by the
designer.
There have been some suggestions to cut in hatches in the
cockpit deck to gain better access, but this would be a great additional
expense to the owners as well as a possible degrading of structural
integrity of that deck. It is hoped that Mainship engineers will come up
with a solution for us "400" owners.
In looking at the layout, a
sliding rack could be fashioned to allow the unit to be slide aft to gain
better access. This could be fashioned easily from angle stock. Hoses
and power lines could be lengthened to provide a loop to allow for this
motion. When the day comes, this may be the route we take with Stella
Blue. The muffler could be moved aft to provide more room. for the
"slide". The deck support tube would have to be removed during maintanence
with this system but this would be a small price to pay. I know as I grow
old with this boat, something will have to be done.
Anyway, on
to other maintenance issues.
Below, just below the water pump and
to the left of the hose to the heat exchanger, lies the bronze plug which
holds the zinc. It's near impossible to change the zinc while the hose and
clamps are in place. There just isn't room enough to swing
wrenches.
By
removing the hose, you can greatly reduce the aggravation factor. You can
now get to the zinc with a box wrench through the starboard hatch in the
sound shield cabinet.
While
we're looking at these pictures, What's wrong with the first picture? You
have to hope you never need to adjust the belt much. If you move the pump
through the range of adjustment, the bottom hose will not stretch
long enough to fit. The adjustment should have been on the top end of the
pump. Another frequent question is the changing of the waterpump impeller.
The easiest way is to remove the bracket with the waterpump and change the
impeller on the bench. Never try to remove the pully to try and remove the
pump from the bracket. You are more likely to damage the shaft and/or
bearings in that way.
If you use your genset, you will find much
black rubber belt residue in the compartment. The belt needs constant
retensioning, which is also just short of impossible with the sound shield
in place. getting at the lower rear alternator bolt is a real chore. Best
best is to remove the battery for elbow room and lay a big foam pad over
the seawater strainer to protect your side. It's a real trick to find the
right tool to wedge between the alternator and engine to hold tension
while you retighten the bolts. I couldn't explain it even if I could
remember. Next time I'm adjusting the belt and thick to bring a camera,
I'll get a picture and post it.
Check here ocassionally for
updates. This page is not done! send suggestions to the e-mail
below.
See Bob Ackley's Genset
Tweaks
E-mail - srcyr@sbcglobal.net |