Injector pump questions about numbers...can anyone help?

[anthonyamato4]

hey everyone im new with the m35a2....my ip is leaking around the hh. i did buy the gasket kit for it and put it on but it still seems to be leaking just as much as it was before. i have to wash it all down again to check on where it is leaking but ive been looking at pumps for sale and i see some have different numbers on the tags. do i have to find a pump with all of the same numbers on the tags to match mine in order for the pump to work with my engine? also i see that some have the density thing off of the back of the pump and some just have a cover....is that needed on one that i buy if mine has it now? if there is anyone that can give me some more education on them i would appriciate it. i did alot of reading and im more confused then ever because everyone is saying different things. thanks

 

[gimpyrobb]

Did the gasket kit have O-rings in it? There are O-rings that go on the hydraulic head, they are known for going bad.

 

[anthonyamato4]

Yes I replaced the 2 o-rings in there and it seemed to be doing good running while it sat but after the first drive its leaking again....have to wash it down and see where its coming from

 

[gimpyrobb]

Some have had issues with the injector lines leaking at the hydraulic head. Make sure you check those too.

 

[anthonyamato4]

Ok will do thanks..you get home and its wet everywhere so maybe it is coming from somewhere else....clean it all up and run it and that will tell me....but any ideas on if pump numbers have to match or if any of the pumps for the 465 multi fuels will work? And what about if the pump does or doesn't have the density thing off of the back of them?

 

[gimpyrobb]

HAve someone watch it when you rev it up. Make sure they have PPE on, might get squirted with diesel. If you can find an LDS pump, I would go with that one over all the others. If you get a complete pump, you should be fine. I wouldn't worry about the FDC, I reccomend by-passing them.

 

[anthonyamato4]

You seem to know your stuff. If I send you some pictures of the pumps and the numbers of the pump that I have and the 2 pumps I can get a hold of would you know enough on which would work best for my engine? I can send the engine number as well.... all of this incase I can't figure out how to stop the leak that I have. Thanks again for this help...like I said this is all new to me...learning lots each day

 

[Heath_h49008]

http://www.steelsoldiers.com/deuce/94469-heaths-m35a2-beginning.html

There are pics in there of my LDS pump.

Also, clean the whole area with something... I used $1 store oven cleaner because I like my money and it's about the same stuff as the $5 Gunk foamy engine bright.

Once you do that, and let it dry, run her and find out where she's leaking from. It would be pretty silly to replace a good pump for a leaking fitting that just needs to be tightened.

 

[anthonyamato4]

I am right there with you on this 1... I don't want to change the pump because it is a lot of work.. And the truck runs great with this pump... so hopefully I can get it to seal. But if I can't I have 2 other pumps 1 is rebuilt 1 is a used pump and I have the pump numbers the use pump is the same number as the pump I have in my truck while the rebuilt pump is a little bit different with numbers and it doesn't have the part on the back for the density.... so along with wanting to get it to seal I also am trying to find out if the pump numbers that I have will work or not... so I am hoping to find somebody who knows more than me about this stuff so I can figure it out

 

[Heath_h49008]

The deuce pumps and HHs are interchangeable... heck the LDS/LDT pumps are interchangeable! (The LDS spec pumps are supposed to move more fuel, but both will work.)

The FDC doesn't make the truck multifuel, it just makes various fuels have the same HP output at a given throttle position. The one with the cover plate is less likely to "make oil." FDCs are normally bypassed due to this issue.

Hope this helps. I'm certain you can find a good home for those "extra" pumps if you have a surplus.

 

[anthonyamato4]

That is good information Thank you... I will go home and check to see what exactly I have. But what do you mean by make oil?

 

[onegmjack]

Leak fuel into engine oil.

 

[anthonyamato4]

Ahh got it. Thanks!

 

[anthonyamato4]

Ok so when looking at the pumps there are LDS and LDT. What your saying is the LDS is rated for more fuel flow? And you find theses letters on the pumps tag under the customer part number....right? The rebuilt pump I have has the LDS in that customer part number....the pump I have in my truck and the used one I have has LDT...so is what your saying that I will be better off with the pump that had LDS in the number if I need to switch out my pump?

 

[gimpyrobb]

It is not necessary, but it should give you a bit more performance. Granted I wouldn't do it with out installing a pyrometer so you know what your exhaust gas temps are. If you run too high of EGT, you can destroy your motor real quick.

Sounded like your satisfied with how your truck currently runs, just need to fix the leak. I would check the ferrules that are on the end of your injector lines where they meet the hydraulic head.

 

[anthonyamato4]

Ok cool. Good to know and that's what I will be checking. Thanks

 

[anthonyamato4]

ok so i washed down my pump today and its still leaking where the hh meets the body. i bought the reseal kit and used the 2 new o-rings in the kit for the hh and it is still leaking at the same spot....where the head meets the body. i spoke to a diesel shop near me and they said with those pumps sometimes the o-ring will push its self into the metal housing and ruin the housing.....anyone ever hear of this happening? if i changed the o-rings under the hh how can it still be leaking from under there? any suggestions or do i have to just change out my pump to another one?

 

[m816]

Any time you go adjusting the fuel on these engines it is best to install a pyromoneter to gauge the Exhaust Gas Temps. I always ran mine right up there and ran the crap out of it. I could get a lot of speed and a lot of power to haul a tagalong trailer and a APC. Eventuallyl I busted the engine from too much fuel and too high temps.( burned a hole right through the piston) Now I have to run with the temps at or under 1200. I have a D trans in the five ton and all but Speed costs money in these trucks. Better to slow down and see the seanery, than dump 3000 in an engine rebuild.

 

[sandcobra164]

Always curious about differences between LDT's and LDS's. I've turned my pump up my LDT, it blows black smoke when you grab a higher gear or when you stomp the throttle but it clears up. That should be plenty of fuel and the truck runs great. Is the advance curve in the governor different on an LDS pump because the LDT pump is certainly capable of pushing enough fuel in my estimate.

 

[gimpyrobb]

ok so i washed down my pump today and its still leaking where the hh meets the body. i bought the reseal kit and used the 2 new o-rings in the kit for the hh and it is still leaking at the same spot....where the head meets the body. i spoke to a diesel shop near me and they said with those pumps sometimes the o-ring will push its self into the metal housing and ruin the housing.....anyone ever hear of this happening? if i changed the o-rings under the hh how can it still be leaking from under there? any suggestions or do i have to just change out my pump to another one?

I would pull the head and check the O-rings didn't get torn or move out of place. I would hate to swap out a pump just cause of a few seals. Once you get it apart, throw a mic. on the rings and post up the size.

I have never seen an O-ring deform the metal of an IP.