[C38] stop switch

Tue Feb 28 08:56:41 EST 2012

Thanks Don.   Well you anticipated my query.  I know that other boats have a
stop lever, but mine (I have Universal 5424 engine) does not.  I had always
thought that that second stop lever was for compression release.    Every so
often I cannot stop the engine by pressing down on the throttle lever so
that's when I go down below open up the engine compartment and lift the
compression release lever.     So what is the stop lever connected to if it
is not the compression release?
Julian

Description: seal2
****************************************************************************
                           Julian Adams
                           Professor of Molecular, Cellular and
Developmental Biology, and of
                           Ecology and Evolutionary Biology, University of
Michigan
                           830 N. University, Ann Arbor MI 48109-1048
                           Tel. (734)-763-3431; Fax (734)-647-0884; E-mail
julian at umich.edu

****************************************************************************

From: Don Strong [mailto:drstrong at ucdavis.edu] 
Sent: Monday, February 27, 2012 4:03 PM
To: Catalina 38 Listserve
Subject: Re: [C38] stop switch

Dear Julian: My Yanmar has two levers on the bow end, starboard side of the
engine. One is the throttle, and the other is what Yanmar calls the "stop
lever."
Both are connected by cables to the cockpit. Pill on the cable for the stop
in the cockpit, and the engine stops instantly.  If the cockpit cable
freezes up, as it did before I replaced the cable, the engine can be stopped
by pushing on the stop lever on front of the engine. 
    The compression release is used for just what Chuck suggests. I also
used it once when the manifold bolts broke, which resulted in exhaust water
shooting into the exhaust ports. I killed the engine,  opened the
compression releases, squirted diesel into each cylinder, and turned the
engine over with the battery. No harm resulted to the engine from this
potential disaster. We replaced the bolts and running again in two hours. If
it had been a gas engine, I would have had to remove the spark plugs to
clear any water from the cylinders.

Don

On 2/27/12 12:49 PM, Chuck Finn wrote: 

We stop our engines by starving them of fuel.  The reason diesel engines
don't have spark plugs is cylinder compression is high enough to cause the
fuel to begin and sustain combustion.   The decompression lever simply
lowers the compression pressure in the cylinders and is generally used to
help turn over our engines when it is very cold or the battery is low.  It
can be used in an emergency to shut down the diesel, but this leaves fuel in
the cylinders (not good) and causes hot gases to blow by the partially
opened valves.  While this probably does not hurt once in a while, I believe
it would hurt your valve seats, guides, etc. in the long run.  Besides the
fact you are mucking up your engine!

If you are having trouble starving the engine, you need to adjust your
throttle linkage.

Hope this helps!
Chuck Finn
Mighty Quinn #114
Great Lakes

On 2/27/2012 12:06 PM, Julian Adams wrote: 

I note the Service manual says that you must not use the decompression lever
to stop the engine - saying it causes serious damage to the exhaust valves.
I've used it many times - is this really a problem. What does it do to the
Exhaust valves? (and what is it for anyway?)
Julian Adams

From: Steve Smolinske [mailto:SSmolinske at rainierrubber.com] 
Sent: Sunday, February 26, 2012 5:59 PM
To: Catalina 38 Listserve
Subject: Re: [C38] head gasket

http://www.marinedieseldirect.com/universal/200157/universal-owners-manual-c
aution-statements.html

Universal engine manuals online

Steve

From: listserve-bounces at catalina38.org
[mailto:listserve-bounces at catalina38.org] On Behalf Of PAUL NOTTE
Sent: Sunday, February 26, 2012 11:36 AM
To: listserve at catalina38.org
Subject: [C38] head gasket

  I need to change the head gasket on Impulse and I'm looking for a free
repair manual , has anyone found one on the net ?

  Paul 

  Impulse 

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-- 
Donald R. Strong
Professor
Dept. of Evolution and Ecology
University of California, Davis 95616
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