Oil & Fuel Diesel for Dummies

SkyPup · Dec 7, 2005

Don't worry, there are allot of bonafide diesel dummies out there. /forums/images/graemlins/tongue.gif

SkyPup · Dec 7, 2005

Skypup, I'm having a hard time visualizing the pre-combustion chamber. Where is it in relation to the valves and combustion chamber? Is it just a scalloped out area within the cylinder head? 

Attached is a diagram of Kubota's IDI precombustion chamber. It is Kubota's Successful Triple Swirl Combustion chamber design to reduce carbon monoxide, hydrocarbons, and nitogen oxide emissions to meet current Tier II emission regulations

SkyPup · Dec 7, 2005

This attached diagram depicts Kubota's current entire IDI combustion chamber design.

N80 · Dec 7, 2005

Excellent. Where'd you get that. I'd love to have drawings and schematics of my tractor's engine.

SkyPup · Dec 7, 2005

Kubota routinely publishes their engineering developments in peer reviewed journals, this was from a CD-ROM from the Society of Automotive Engineers Off Road Engineering section:

Development of the Small-Sized IDI Diesel Engine Kubota 73.6mm/78.4mm Stroke Series

AUTHORS:
Hirotaka Nakajima - Engine Engineering Dept., Kubota Ltd.
Masahiro Yama****a - Engine Engineering Dept., Kubota Ltd.
Yasunori Shiraishi - Engine Engineering Dept., Kubota Ltd.
Kiyoshi Hataura - Engine Engineering Dept., Kubota Ltd.

SkyPup · Dec 8, 2005

Excellent. Where'd you get that. I'd love to have drawings and schematics of my tractor's engine. 

Have you got the Kubota PDF files for your tractor from Ronnie Bowman @ TractorSmart?

Those would show you the location of your injection components with the engine and also give exploded parts diagrams to show you where everything is located. /forums/images/graemlins/wink.gif

N80 · Dec 8, 2005

That would be great. I looked at the web site but couldn't find a link to the PDF file you mentioned. They have a link to manuals, but that's probably not the same thing. Do I need to contact him personally?

SkyPup · Dec 8, 2005

Write Ronnie an email directly and tell him what specific model of "Bota you have and its transmission type, if you have a FEL or BH, let him know that too, he will email you back a link to the offical Kubota PDF parts manuals for your machine and your implements. /forums/images/graemlins/wink.gif

IslandTractor · Dec 8, 2005

( (
The way to shut a diesel off is to stop the fuel flow.
)

Or cut off the air flow. Both of which really applied to older engines. Newer stuff, being all electronically controlled, cutting off the juice will stop the process also. )

Or, simply release the pressure in the combustion cylinder. Some diesels, eg. Yanmar GM series (not sure any CUT engines) have such pressure release systems. They are also useful for manually starting small diesels as you cannot usually crank a desiel by hand due to the high compression but if you release the pressure you can crank it to build momentum and then close the release valves one by one which will start the engine.

SkyPup · Dec 8, 2005

So how did you like Sir Ricardo's description of the fuel injection event?

"The Comet IDI Combustion Chamber:

The famous Ricardo Comet IDI diesel combustion system for high-speed diesel engines was developed in 1931 for AEC to use in the London Buses.

The world's first production diesel passenger car, The 1935 Citroen Rosalie, featured a design by Ricardo incorporating the Comet Mk. III combustion chamber.

Derivatives of this design are still used by the world's major engine makers in today’s designs."

N80 · Dec 8, 2005

( So how did you like Sir Ricardo's description of the fuel injection event?)

It was great. Read like a story....."It was a dark and stormy night...."

I emailed the guy at TractorSmart, thanks for the tip.

I see that you live in North Central Florida. I was stationed at Eglin AFB for 3 years in NW Florida. Beautiful place. Lotta white sand.

SkyPup · Dec 8, 2005

The kind of white sand that "squeaks" when you walk on it. /forums/images/graemlins/wink.gif

Highbeam · Dec 8, 2005

Well sure, you could also stall the engine with the clutch. The normal way to shut off the Kubota in question is to stop the supply of fuel. It is just a wierd diesel thing since there is no spark or throttle. There is an electrical solenoid that stops fuel instead of the older cable control.

N80 · Dec 8, 2005

Its even sandy for a good many miles inland. I don't know how hard that sand is on machinery, but I used to ride my mountain bike on the AFB (which is huge and has many square miles of woodland) and it was hard on the bike. The brakes (which grab the bike's aluminum rim) would wear _through_ the aluminum rim because the sand was so fine and abrasive.

JustGary · Dec 8, 2005

"I was stationed at Eglin AFB " 

Cool. My own stomping grounds mentioned on TBN. I'm in Niceville, just North of Eglin. I play lunchtime soccer on base a few times a week.

Yup, the sand is bad on everything. Paradise has its costs. They say the sand squeaks because of a certain bacterium, but I still think it's the salt. It only does it at the beach.

Skypup is near Gainesville, about a 5 hour drive from here.

- Just Gary

N80 · Dec 8, 2005

We lived in Niceville in a little cookie-cutter neghborhood called Blue Pine Village. The base 'reservation' was just down the road. Did some duck and deer hunting in my free time...which was severely limited since I was doing my residency at the base hospital...100-120 hours a week. Very interesting geography down there. Would love to get back down there sometime....but a quick glance at the map confirms that you can't get there from here....in a car anyway. (Kidding of course but the trip back and forth from here in SC is just awful.)

JustGary · Dec 8, 2005

We're dangerously close to hijacking this thread, but here goes...

I live about a mile from Blue Pine Village, just across from the Fire Station on White Point Road. You wouldn't believe the development that continues around here. The prices have gone absolutely crazy, and people keep buying. I don't know how most of the military folks can afford anything at all when they come here now. I just checked, and a 1625 sf home on .13 acres in Blue Pine is $289K.

I know several doctors from Eglin, where did you work?

- Just Gary

N80 · Dec 8, 2005

( We're dangerously close to hijacking this thread, but here goes...)

Well, I started the thread.....so I don't mind too much. And I think it had run its course anyway.

( I know several doctors from Eglin, where did you work?)

I was in the Family Practice residency program, but that was, um, 12 years ago. And folks don't stay in one place very long in the USAF. The only person I might know down there now is Dave Riggs, who moved down there recently. Pete Senechal, Tim Tuel and Paul Freitas are out of the AF but living in the area still.

JustGary · Dec 8, 2005

I know that the Urology department has had the same guy for at least the last 9 years (that's how long ago I met him), and I'm not sure how he stays put. He sounds like he's going to stay for a while longer. Maybe he made some sort of deal.

I'm sure you met my mother (Lillian) in Family Practice. She's been a Red Cross volunteer at Eglin for around 30 years. She mostly bats around between FP and Flight Medicine, depending on how much she likes the staff. She's still hard at it.

- Just Gary

SkyPup · Dec 11, 2005

That BOSCH Diesel book is a good read too and 100% applicable to your Kubota's inline fuel injection pump and fuel injectors as all of NipponDenseo stuff is licensed from BOSCH, in fact, I think they are now a subsiday of BOSCH too! /forums/images/graemlins/wink.gif