[C38] stop switch

[Don Strong]

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-caution-statements.html
>>
>> Universal engine manuals online
>>
>> Steve
>>
>> *From:*listserve-bounces at catalina38.org 
>> <mailto:listserve-bounces at catalina38.org> 
>> [mailto:listserve-bounces at catalina38.org] 
>> <mailto:[mailto:listserve-bounces at catalina38.org]> *On Behalf Of 
>> *PAUL NOTTE
>> *Sent:* Sunday, February 26, 2012 11:36 AM
>> *To:* listserve at catalina38.org <mailto: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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>
>
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-- 
Donald R. Strong
Professor
Dept. of Evolution and Ecology
University of California, Davis 95616

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