8.3 Cummins Gleaner?

I run 2 R62 s with the 8.3,my original one has 8000+ Engine hours and 6300 rotor hours. I had to rebuild the motor at about 7000 hrs because they have an idler gear between the crank gear and oilpump gear and the idler broke and i lost oil pressure. Caught it quickly,but still lost turbo,it locked. Pulled motor down completely and liners where perfect still, so new orings on liners,piston rings and all bearing shells,plus seals gaskets ect. I disassembled the head and all valves and valve guides were all perfect. Very good motor with mid mounted liners ,so no cavitation pits at all on the liners. Dont know why the idler gear failed but otherwise couldnt fault it.

What is a caps fuel system?

This looks like P pump with aneroid valve period. Seen a caps once and this doesn't look like it. From serial # it's a 97

Edited by SteveM C/IL - 03 Dec 2020 at 8:57am

I had a 2002 R62 with the Caps Fuel System, also a 2005 R65 with the CAPS. Marginal fuel system as its best. Head gasket coolant leakage to the outside of the engine block is common, pretty easy, straight forward repair. I always used genuine Cummins gaskets and bolts if needed. 8.3 mechanical is a good and reliable engine. 97 R62 will have the longer shoe which it needs. Good Luck, Mike 

At one time around here we had 8.3s in the combine,grain truck, and the 4wd New Holland. Combine had a little over 3500 hrs when we traded it off. It’s still going. There’s a lot of trucks with 8.3s with a lot of miles on them. A good solid engine.

Nothing wrong with the caps fuel pump. It’s only limited by the people working on it that have no clue how to make it work.

Edited by im4racin - 03 Dec 2020 at 6:36pm

Caps is basically a high pressure pump like common rail but has a distributor instead of a rail and poppet injections. The injection control valve interrupts fuel flow between ports in the distributor. There are 3 basic parts to the pump assy. The pump next to the gear housing with the big block on the top that holds the pumping chambers and “fill valves”. The injection control valve located between the big block and the distributor housing. And the distributor housing hanging on rear of pump housing. The fill valves open to allow fuel into pumping chambers   The time open is related to pressure required. The icv interrupts fuel the pump builds as needed to change timing and stop flow between ports as the distributor rotates. They are really simple but the diagnostic steps are more of a good guess than direct steps. There are parts in the system that aren’t talked about or tested in diagnostic and that is what will cause most people trouble when troubleshooting

That was probably those porcelain parts in the head fill valves or pumping chamber or whatever that crap is.  They're supposed to be lubed by fuel, did it 3 times on my 65 and then finally spent $5k on a whole new pump and know it throws codes that there is air in the system but everyone throws there hands up now.  My brother had a CaseIH 4wd with a cummins with a caps system, worked on it for years, in a last ditch effort tried to put a mechanical back on the motor but never worked, he sold the tractor on auctiontime. It didn't bring much as everyone already knew about caps.  I once called cummins about my 8.3 and when I told the guy it had a caps he said "UH OH"  They didn't use it long.


Edited by Kansas99 - 04 Dec 2020 at 1:43am

Ya if you see somebody walking in with one of those lock your doors!

8.3's had a front cover leak problem, we had R62 &they fixed that when we got it. We now have R65 w/Sisu, about a third less fuel. Both engines perform well but can't believe the difference in fuel consumption.

im4racin wrote: Find a better tech

Edited by SteveM C/IL - 05 Dec 2020 at 10:49am

I like the KISS rule. If it's difficult, not to mention expense, to service then there might be a problem even if it "can" be a good system. Like a Deutz engine.

JPG AUSTRALIA wrote: Both my engines run the bosch inline pump.only bad thing id say about my 8.3s is that they love to drink fuel. I use alot more fuel at harvest then at seeding time.

I noticed that my L2 took a good bit less fuel to harvest the same acres as my R52.

SteveM C/IL wrote: Lonn wrote: JPG AUSTRALIA wrote: Both my engines run the bosch inline pump.only bad thing id say about my 8.3s is that they love to drink fuel. I use alot more fuel at harvest then at seeding time. I noticed that my L2 took a good bit less fuel to harvest the same acres as my R52. My F2 uses less that 2 gal per acre...an 8.3 R62 would suck compared to that! Oh well.

Hard to beat the 433TI motor on fuel.