Re: [Amel Yacht Owners] Diode in Starter shutoff circuit - Super Maramu


Danny and Yvonne SIMMS
 

Hi all,
about 40 years ago I had a diesel tractor with an oil bath air filter, excellent for the high dust situation the tractor worked in. However having done its job of removing dust and sediment very well it needed to be thoroughly cleaned. Being soaked in engine oil that was not an easy process. I washed the gauze in petrol, shook and tapped the unit to remove the petrol, left it to dry and then refitted it and started the engine. Oh boy, there were some petrol fumes left and that engine screamed at impossible revs and nothing on earth would stop it until the petrol fumes had gone. I pulled the stop cable, I turned off the fuel, and then retreated to a safe distance and watched until it stopped. Remarkably the engine seemed to have suffered no damage. It would have been insane to have blocked the air intake with anything. If a body part had gone anywhere near it it would have gone through the engine. That was a runaway situation, and as Bill said a diesel at revs will cheerfully run on any oil product. I was circumspect in my first comment as I assumed the reference was to an engine at idle where the electric stop failed.
Cheers
Danny
SM 299
Ocean Pearl    

From: "'Bill & Judy Rouse' yahoogroups@... [amelyachtowners]"
To: "amelyachtowners@..." <amelyachtowners@...>
Sent: Tuesday, 3 June 2014 3:41 PM
Subject: Re: [Amel Yacht Owners] Diode in Starter shutoff circuit - Super Maramu
 
The rule for blocking air intakes to shut down a runaway engine, is do not do it, because it is possible that your piston rings are worn enough that the engine will pull air and oil from the crankcase and continue running until it burns itself up.

Get familiar with the engine you have. All diesels that I have seen on Amels and other boats have a mechanical shut off. Your generator has the same. Some engine manufacturers paint it yellow or red.

Bill
BeBe 387
On Mon, Jun 2, 2014 at 10:44 PM, Richard03801 richard03801@... [amelyachtowners] <amelyachtowners@...> wrote:
 
Yep that valve will do it. 
DO NOT EVER NEVER EVER USE YOUR HAND OR ANY BODY PART TO BLOCK THE AIR INTAKE. USE A BLOCK OF WOOD OR A MATT. Fair Winds Smooth Sailing To All
Capt Richard 
RP Yacht Brokerage
Newport RI 
We list sell and service fine yachts including Amel's
On Jun 2, 2014, at 15:44, "Yvonne simms@... [amelyachtowners]" <amelyachtowners@...> wrote:
 
Hi all,
The volvo TMD22 Perkins has a mechanical shut off on the side of the injector pump, easily activated by hand. rather that than risk my hand disappearing into the air intake..
cheers
Danny
SM 299
Ocean Pearl
On 3/06/2014, at 4:32 am, "Alexandre Uster von Baar uster@... [amelyachtowners]" <amelyachtowners@...> wrote:
 
A couple of years ago, I took a basic diesel class.
That question came and the answer was prety easy.
You could shut down the fuel valva, but really the easiest is to block (with your hand or piece of cloth) the air intake.

2 months ago, some kid on Spring Break came and had the same problem, so I show them.

Then came the question, how do restart the engine.
On boats, started are "hot", so always connected to the batteries.
So you can just connect the 2 wires and it will start the engine.
Just make sure you are not touching any moving parts.
Personally I use 2 wire and a little press switch.
On some engine, starting without the key, might not allow the alternator to charge.

After showing the kids on spring break that, I was their hero for the next few days!

Sincerely, Alexandre
SM2K #289 NIKIMAT
Bay Street Marina, Nassau, New Providence, The Bahamas

--------------------------------------------
On Mon, 6/2/14, svperegrinus <no_reply@...> wrote:

Subject: Re: [Amel Yacht Owners] Diode in Starter shutoff circuit - Super Maramu
To: amelyachtowners@...
Date: Monday, June 2, 2014, 11:13 AM


 









Hello,
Related
question: if our diesel engine ever were to fail to stop on
activation of the red rubber "STOP" button, what
would the shutoff procedure be?
I realize the Yanmar engine has
different circuitry from the Perkins, but an analogous
failure could take place.
Regards,









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