Long Awaited First Start! (link to video)

[Diesel JD]

John Deere used db4 pumps on many engines, Ive seen some timing ring and lock pin failures, not many but usually on a unit that was poorly maintained, when the fuel filter gets plugged the pump can pull in air and my friend has seen the pin hammered almost gone.
remember the pop pressure is 2100 ish, injection pressure can be as high as 12k on some applications, like a direct injection Deere.

Lets see how Kens repair goes and give it some time before condemning.
And the aerated fuel is likely the problem, remember , custom race /performance items seldom work out of the gate the first time ,unless you have unlimited R&D budget.

Russ, NMB2 was trying to explain to me how air intrusion can cause this kind of damage, something about how the air causes the advance piston to get beat up. Your pump guy says the same thing. If this ever happens to a stock-ish pump I'm probably a good candidate since I seem to plug filters more frequently. Do you think for my benefit and everyone else's we could discuss a bit more how exactly air intrusion beats up the advance piston? I guess the thing I should do is have a fuel pressure gauge. I keep discussing this with gatorman since he has a good setup. Does anyone else have a fuel pressure gauge or gauges? Mostly interested in protecting my pump, but for a stock pump Justin's fix seems like big bucks...for a DB4 I would probably mostly copy his system AND have a gauge, just cause it's a big investment. As far as the comments about Calvin and the DB4 hybrid, he can correct me if I'm wrong but I think his guy used the innards of a DS4 not a DB4 and the failure point was the pump shaft snapping. I also remember Motrack and RKoch discussing DB4 pumps. For those who recall, RKoch did some outside the box turbo kits as well but they were always remote mounts and used DT466 or T444E turbos, and Motrack was a huge IDI fan and an old Deere mechanic. Unfortunately both those guys are harder to get hold of than Ken on his worst days. Also worth noting that Ken has greatly improved his customer service since people on here were using his products. He's been available to Justin to help solve this issue. None of us can really say how reliable the DPS DB4 pump is, but if we get some good mileage on the NMB2 build and the other 2 with no further failures, I'd be willing to assume it was a random weird thing caused by the air intrusion like Ken said. If we keep seeing failures, obviously something else will need to be developed for these HO builds. Sorry for the Hijack Eric, hope you can give that thing some more fuel, whatever route you choose to go and congrats on getting it started up.

 

[typ4]

Simply put the advance assy has case pressure fuel on both sides of it and a slug of air on either side will"chatter" it for lack of a better word. Also running 4 plungers on a mechanism designed for 2 at elevated injection pressures and things will rattle around.
These facts were also backed up by a pump shop here in town that I havent used but does some hot marine work, guess where i am going tomorrow.

 

[Diesel JD]

Ok...the only thing that's strange about this to me is that from what I'm told the DPS DB4 is all DB4 in terms of internal parts, only the case is DB2. I guess the case is the mechanism you're referring to. I'm not being smart about all this, just trying to learn. At this point I know only enough about IPs to be dangerous, lie intelligently etc. .

 

[Fordsandguns]

Ok...the only thing that's strange about this to me is that from what I'm told the DPS DB4 is all DB4 in terms of internal parts, only the case is DB2. I guess the case is the mechanism you're referring to. I'm not being smart about all this, just trying to learn. At this point I know only enough about IPs to be dangerous, lie intelligently etc. .

I think it uses the DB2 shaft as well. At least I remember reading that.

 

[typ4]

The advance mechanism and gov and shaft parts are the db2 IIRC .
The difference was most of the big equipment was constant speed so once the timing was sset it stayed, there was no advance in the pump, gensets and the like.

 

[tjsea]

congrats on getting it up and running, can't wait to see it finished!

 

[Ididriver]

any updates yet? she on the road?

 

[88 Ford]

What he said...

 

[RustyBolts]

Just found this one, and it's *******! That's right, I just compared this build to the awesomeness of *******!

 

[88 Ford]

******* are good. Haha

 

[hesutton]

Eric, anything new? Hoping to see more of this awesome build and see how it's running performing for ya.

Thanks man,

Heath

 

[88 Ford]

X2 I just thought about this and was wondering how it is doing?

 

[Keeway]

damnnnn man thats sick!