Injection pumps

gtx1967jewison · Jan 22, 2014

Can anyone tell me if the Bosch/scintilla injection pumps on a 720/730 are the same as on an 820/830?
Thanks!
J

buickanddeere · Jan 22, 2014

Yes and no.
The 70,80 and green Dash 820 used 10mm pumps. The 720,730,black dash 820, 830 and 840 used 13mm pumps.
Injector tips varied with 5 and 6 hole units with 10 and 12 thou orifices.

Anonymous-0 · Jan 23, 2014

The pumps are the same except for the plunger followers on the bottom of the pump.

gtx1967jewison · Jan 23, 2014

Thanks! Do you happen to know anything about the 15mm
ones used in marine engines? Like where to find them

buickanddeere · Jan 23, 2014

I have wondered is the injection pump elements from old time large displacement industrial diesels would bolt into the Deere ?

gpuller · Jan 24, 2014

(quoted from post at 18:00:46 01/23/14) Thanks! Do you happen to know anything about the 15mm
ones used in marine engines? Like where to find them

They put 2 cyl diesels in boats?
There are guys out there that make what your looking for, but you'd better have some cubes to burn the fuel they deliver. 13.5mm's have to be weaned way down for a 720/30.

buickanddeere · Jan 24, 2014

I've wondered if the Z or C pump elements may be a drop in upgrade for a two cylinder Deere ? Don't know if JD uses the 12mm or 15mm stroke pump?

http://www.oldengine.org/members/diesel/injection/Bryce4.htm

I updated an A pump on a Petter diesel from 7mm to 8mm. Limited the 8mm delivery volume to the same as the 7mm's volume. Engine runs better with the injection event ending while the piston is higher in the bore.

gtx1967jewison@yahoo.com · Jan 25, 2014

Not 2 cylinders, but the pumps were the same design I am
told. I cannot find anyone that will divulge more info, not even
where to go or who/how, nothing. I have a stock R that I just
want more fuel, perhaps a few more horses & a better show at
the pulls. Can I just use 730 pumps & leave my stock
nozzles/injectors/pistons? Or do I need to bore it & change
pistons & injectors ? Any help is greatly appreciated!
Thanks
J

buickanddeere · Jan 25, 2014

(quoted from post at 16:14:51 01/25/14) Not 2 cylinders, but the pumps were the same design I am
told. I cannot find anyone that will divulge more info, not even
where to go or who/how, nothing. I have a stock R that I just
want more fuel, perhaps a few more horses & a better show at
the pulls. Can I just use 730 pumps & leave my stock
nozzles/injectors/pistons? Or do I need to bore it & change
pistons & injectors ? Any help is greatly appreciated!
Thanks
J

Stock HP will break the two bearing crank in a R. Best bet is to find a 820 blackdash and build it.
Cam,valve.port, inlet filtration and injection work will make 100+HP at stock rpms.

Gpower · Jan 26, 2014

Gtx, drop me a line, I can help you out.

gpuller · Jan 26, 2014

(quoted from post at 18:56:11 01/26/14) Gtx, drop me a line, I can help you out.

There you go. Good to see you MO! Gpower can help, he got me set up.
I don't drink the R crank breaking kool-aide. Plenty of high powered R's and nobody has a story to tell?

Gpower · Jan 27, 2014

Yeah, me either, I know I was "cranking" out 88hp on the dyno at 560-570 pto rpm when the pto gears gave out. Any crankshaft can break.

gtx1967jewison · Jan 29, 2014

THANKS Gpower!
sincerely appreciated, i think i got an email sent off to you

Gpower · Jan 30, 2014

Yep, just replied.

Kent Petersen · Feb 2, 2014

B&D i have heard that storey for years but can't find a body that will say he did have one brake i know a guy that has 2 Rs overboered to 730 pistions turning right at 100 HP and he has never broke acrank

buickanddeere · Feb 2, 2014

(quoted from post at 10:23:52 02/02/14) B&D i have heard that story for years but can't find a body that will say he did have one brake i know a guy that has 2 Rs overbored to 730 pistons turning right at 100 HP and he has never broke a crank

Local salvage yards in Teeswater, Blyth and Listowel had several R corpses with the crank removed.
JD engineers themselves went to the three bearing crank as they were breaking cranks when R's were still in production.

Injection pumps

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