On Aug 17, 4:06 am, wrote:
On Thu, 16 Aug 2007 19:13:57 -0400, "Roger Long"
wrote:
I went back down to the boat for something I forgot and decided I wanted to
play around a little more.
I've been telling myself since I got the boat that I should try hand
starting the diesel. Better to climb the learning curve at the dock than
while drifting down towards a steep lee shore after some electrical system
disaster. I also have the hand start ability factored into my battery
management strategy. Thanks to this newsgroup, I know that hand starting a
20 hp, twin cylinder, diesel is near the edge of feasibility but doable.
I pulled the big forged or cast iron starting handle out of its handy
brackets next to the engine and put it in place. HUH!? The fiberglass
structure of the engine compartment enclosure makes it impossible to turn
the handle more than a quarter turn. Since hand starting requires getting
it spinning rapidly with the cylinders decompressed and then using the
inertia of the flywheel and engine to (hopefully) kick it into life as you
continue to assist with the crank, there is no way this could begin to work.
I can categorically say that no one has ever hand started one of these boats
unless they were originally delivered with a special handle that the PO
perhaps replaced with the stock item (judging by the paint) not realizing
that it couldn't possibly start the engine. This design defect has
persisted through multiple models of a 1980 boat without ever coming to the
notice of the builders or being noted on the owner's group web site. This
is the most common engine installed in the class.
It's a perfect lesson of the test-everything-and-assume-nothing principle.
I now have a conundrum. I can spend more money to have the handle cut apart
and an extension welded in. The leverage of the cranking force working over
the longer length makes proper functioning questionable unless some
structure with a bearing is provided. I just spent a couple hundred dollars
on insurance in the form of chain so I'm not sure a starting handle for an
engine that can just barely be hand started is the wisest next expenditure.
I may just remove all of the hand start apparatus, which is pretty extensive
and in the way on this particular model, and join the ranks of larger boat
owners who live with the fact that their engines are not going to start
without a functioning battery and electrical system.
Hey! Isn't the Roger Long who designs boats?
Now you know how the rest of us feel when we discover that to save
space, make the hull a better shape, or some other trivial reason you
can't get THAT nut off until you remove THIS thing over here :-)
Bruce in Bangkok
(brucepaigeATgmailDOTcom)- Hide quoted text -
- Show quoted text -
Come on Bruce, boat designers know what they are doing:
http://www.youtube.com/watch?v=8F_GW1ep5ls
Joe