Oil & Fuel Diesel for Dummies

[SkyPup]

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

 

[SkyPup]

<font color="blue"> 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? </font>

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]

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

 

[N80]

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

 

[SkyPup]

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 Yamashita - Engine Engineering Dept., Kubota Ltd.
Yasunori Shiraishi - Engine Engineering Dept., Kubota Ltd.
Kiyoshi Hataura - Engine Engineering Dept., Kubota Ltd.

 

[SkyPup]

<font color="blue"> Excellent. Where'd you get that. I'd love to have drawings and schematics of my tractor's engine. </font>

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]

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]

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]

</font><font color="blue" class="small">( </font><font color="blueclass=small">(
The way to shut a diesel off is to stop the fuel flow.
)</font>

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. )</font>

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]

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."