Engine/Transmission (1994 - 1998) doing the lift pump.....suggestions, advice?

[The patriot]

It looks easy enough, and I have one in the garage. I'd guess about an hour from start to finish.

Is there anything I'm overlooking? Special instructions? Should I put some lube on the end of the pump rod?

Anything else?

TIA.

Eric



PS Not that it matters, but mine is an 1998 12 valve.

 

[Joe G.]

Make sure that the cam lobe is on the low spot, not the high. Plenty of lube oil there so extra lube on the pump rod is not necessary. Be careful you don't drop the rod in the oil pan. A couple of slighly longer screws are a help to putting it back on. You can remove the longer screws later.

 

[EBansberg]

use cummins gaskets and you may want to use a very little bit of gasket sealer to hold them in place as it can be kind of difficult with the heater. Also, an hour is probably reasonable assuming everything goes ok. You may want to give a little extra just in case.

 

[bgilbert]

A Cummins gasket thats nice to use is 3939258, it has a rubbery like material on it. Supposed to be better than the regular gasket. Costs about $2. Is your old LP bad? They usually don't wear out. Not like the electric LP's. Rebuildable as well. Edit for correct pn.

 

[tp0d]

bgilbert:



can the o-rings and checks be replaced on the pump without removal from the block? (i`m sure that would be a PIA to do, but mebe easier than removing the pump. . hmmmmmmmm)



tnx



-j

 

[GOTSOOT]

put studs in the block-slid gasket on -slid pump on -much easier that fighting with keeping the gasket in place and getting the bolts thru W/O moving the gasket.

 

[ABorchard]

I've ran into a couple where the actuator arm fell off the pump upon removal.

It would be a major bummer if it fell into the engine. Just keep an eye on it in case it falls off and you can't find it and remove the pump with a downward motion.

 

[The patriot]

Good info. Thanks!

Eric



PS I THINK it's the LP. See here: https://www.turbodieselregister.com/forums/showthread.php?t=128347

 

[The patriot]

cummins gasket.................

well nobody around me has one in stock. I went and looked at the one that came with the LP. It's a gen-u-wine :-laf cummins LP, and the two gaskets in it are a sandwiched sort of a material. No part #'s on them.

Do these sound like the "good" cummins gaskets?

I got the pump on flea bay, so I cant say for sure if these gaskets came with it origanally.

Eric

 

[bgilbert]

The Cummins gaskets I've had all have a Cummins part number on them. This is a job you only want to do ONCE. Why risk using an el cheapo gasket only to have it leak shortly down the road and have to do the job again. Call Scheids or a Cummins distributor or other vendor, they can ship you a gasket. Thats just what I'd do, I don't like anything but Cummins parts. While on the phone you could verify if you do have the newest part number LP.

 

[Dieselnerd]

The lift pump has had several updates. Unless it's changed again I believe the latest is 12 Valve Lift Pump, Cummins P/N 3936316.

 

[The patriot]

Yup, that's the part # on the box, and the pump itself has one of those scan bar tags on it with the same #, but no number on the gasket.

Guess I'll call Cummins up north jersey again tomorrow. I got the message machine 2x, but no call back.

Thanks guys.

Eric

 

[EBansberg]

If the gaskets you have are a paper type they aren't the right ones. The good ones are a rubbery material and black or dark gray.

 

[The patriot]

If the gaskets you have are a paper type they aren't the right ones. The good ones are a rubbery material and black or dark gray.

Mine has an almost black rubbery`ish material sandwiched over what looks like aluminum in the middle. No number, so I'm getting the one from cummins, even if I have to drag it out of them.

Eric

 

[Scot]

. Rebuildable as well.

??? I know the book says it is and even shows how to do it. Cummins parts man says he has never heard of a kit nor did Cummins Research. Are the kits or check valves available?

 

[AMink]

Page 98 of the new TDR magazine (issue 48) has an article on how to replace the lift pump.

 

[The patriot]

Got the new gasket today from the cummins shop. The new one dont have any numbers on it either, and I saw the guy take it out of a cummins package.

It's identical to the two that came with the pump. Oh well, at least I can now rest easy after I do the job.

Eric

 

[BigPapa]

I replaced mine Wednesday night, didn't go well. I read the article in issue 48 today.



My truck is a 2WD so I don't know about dealing with the differential from below, but I don't think I could have done it from above because of the brake master cylinder. THAT wasn't even mentioned in the article. Removing my starter is easy compared to working around the master cylinder and brake lines.



Also not mentioned in the article is the fact that the new pump is about 1" shorter where the 90* fitting screws in, rendering the formed hose between the pump and the pre-filter useless. Has anyone else had this problem? How did you deal with it?



I spent 3 hours in Nashville running from one truck dealer to another (all the big rig places stay open till midnight!) looking for fittings or enough 1/2" fuel hose to make a loop. None of the four major big rig shops (Cummins, Volvo/GMC, International, Kenworth) in Nashville had ANY 1/2" fuel line. The last place I went sold me 3' of 1/2" air conditioner hose for $10 to get me on the road (wife had to have her car the next day!) . I bought 2' of 1/2", 3' of 5/16", and 3' of 3/8" Goodyear Ortac 300 today for the same price!



Enough ranting! :{



If I had it to do over again and knew what I know now I would have 2' of 1/2" fuel hose and 2 studs and nuts (good idea GOTSOOT!) laying there before I ever picked up a ratchet. Also make sure you get the steel line going into the top of the prefilter started BEFORE you get the mounting bolts going or you'll just have to pull them back off. Also, do what ever it takes to keep from dropping your fuel filter (full of fuel!) onto everything you were using that's laying under the truck, including your mat if your doing it in the gravel drive like I did, trying to anticipate a fuel spill. :-laf



Scott

 

[KYOUNG]

lift pump

I also had trouble with a shorter lift pump and the hose, ended up making a small loop of 1/2 "hose... ... ... . studs would have been really helpful!!!

 

[The patriot]

I'm going to wait until whenever issue 48 decides to show up.

Eric