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Tractor Talk Discussion Forum

Monarch diesel with low-pressure injection?

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John de Marrais

09-22-2006 11:35:06




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Anybody out there have a working-knowledge of a Monarch air-cooled diesel engine? As far as I know, it"s a US Military model, air-cooled, three cylinder around 31 horsepower. Seems to be some sort of copy of the Lister diesel design. But, it doesn"t seem to have any kind of fuel injection pumps or injectors. That"s something new for me - I"ve never encountered any diesel like it. I"ve had Listers and they had high-pressure pumps and injectors for each cyliner. This thing has low-pressure electric fuel pumps (5-10 PSI maybe) hooked to lines that disappear into the top of the head - and I suspect maybe go into the air-intake? The tag on the engine reads "Condel Monarch CSR3Z01180M05"

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Gerald J.

09-22-2006 13:53:13




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 Re: Monarch diesel with low-pressure injection? in reply to John de Marrais, 09-22-2006 11:35:06  
My curiosity got me to do a google search on "monarch diesel" with the quotes to keep the hits down to 167.

What I found is that this IS a Lister engine. It was sold through an American company called Monarch who put a few finishing touches on it to meet the Buy American Act. (While I was on active duty, I found "crescent" wrenches made in Taiwan in boxes made in the USA met that act.)

It does have individual injection pumps under the rocker covers, they are linked to a control from the governor.

There are manuals available on epay, either in paper or on CD. Many times the alternators were wound for 400 Hz, which limits their use around the house.

Your model is a CSR3 from Lister-Petter. I read that there is some information and are some parts available through Lister, but I gave up before the page completed loading. All I saw on their home page was much newer models.

Gerald J.

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jdemaris

09-22-2006 14:06:27




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 Re: Monarch diesel with low-pressure injection? in reply to Gerald J., 09-22-2006 13:53:13  
That makes sense, and thanks for the info. The guy that has it bought it as a genset - but then discovered it was 400 cycle. He does not know much about diesels, but insists the engine is a "low pressure" diesel with NO injection pump. I couldn't figure, if so, how it could work? The word "diesel" is analygous to "compression igniton", and - any diesel I've worked on - fires when the fuel is injected. So, something with at least a compression ratio of 16-1, and likely higher, needs some sort of high-pressure injection as I figure it. If the fuel was simply dribbled into the air-intake, what would time the firing? That's a rhetorical question, I guess. But, while I was at this guy's place, I tried to keep an open mind. No injectors were visible, and the governor is electric - the electric servo operates a rod that goes inside the block or head. I suspect it goes to the injectors hid inside, as you mentioned - probably similar to a Detroit Diesel setup. First one I've seen like this, though.

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Gerald J.

09-22-2006 18:29:57




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 Re: Monarch diesel with low-pressure injection? in reply to jdemaris, 09-22-2006 14:06:27  
I almost bid on a manual in Alaska but the seller wanted to only tell shipping costs after the auction closed and I don't like the surprises that policy can give.

400 Hz three phase does interfere with much house use. It will run the TV, the computer, the battery charger, and incandescent lamps, maybe fluorescents with solid state ballasts, but not older ballasts or motors except for series motors. It would run resistance heaters, but not their fan motors.

It would be almost practical to run a 3 phase battery charger with it and run inverters from the battery for 60 Hz loads.

Rewinding the core probably isn't practical. I suspect the high frequency comes from a few poles of aternator but with notched pole faces to get 400 Hz without having to have a 16 pole alternator running at some obnoxiously high speed.

Years ago, I would have been interested in the 400 Hz capability since I had some military surplus radios that needed 400 Hz power, but they have wandered off as did a 400 Hz motor driven alternator that I had. Seems when I loaned it out, that party moved away and forgot it was a loan and took it with him.

These days I have good 60 Hz alternators and for some applications don't need several KW of power and for some things get along fine with 10 amps at 12 volts.

Gerald J.

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RustyFarmall

09-22-2006 15:40:01




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 Re: Monarch diesel with low-pressure injection? in reply to jdemaris, 09-22-2006 14:06:27  
Possibly a non-variable speed type of governor? The engine is either at idle or full tilt, nothing in between, kinda like the diesel engines on semi-truck reefer trailers.



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Gerald J.

09-22-2006 12:40:45




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 Re: Monarch diesel with low-pressure injection? in reply to John de Marrais, 09-22-2006 11:35:06  
Has it individual injector pumps driven by the cam and inserted into the head?

Gerald J.



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