CP4.2 upgraded injector pump (pinned lifter bores RCD performance)

[Dougstdig]

The CP4.2 pump is mechanical like the CP4 and CP3. The difference on our vehicles is the injectors are controlled by the ECU and expect the pump to be properly timed.

Removing the pump isn't to difficult but you need to remove the grille, radiator, condenser, etc.. to give yourself some room for the bolts and pump to come out. The pump needs to be removed straight out as it is pressed onto a gear attached to passenger side cam.

To reinstall, you need to make sure cylinder #1 is at TDC as everything is timed off of this cylinder. The pump must be oriented internally to correspond to cylinder #1 at TDC. There are installation tools you can buy to aid in this for $100-ish that will lock the crank and cam during assembly. This is needed to ensure the gear on the cam does not rotate when pressing the pump into place. Next you use a degree wheel to time the pump prior to installation. The fuel delivery dot, and drive cam need to align to 65 degrees. Reinstall straight onto the cam gear and torque to spec.

If the pump is out of time by a degree or two, you're fine as perfection isn't achieved at the factory. If you're off more than a couple degrees and send it you will throw codes like no tomorrow. The vehicle will also run rough, be under powered and smoke, if it even starts at all.

If this occurs, pull the pump, check timing and reinstall. It's not a difficult process but one that inexperienced technicians will find daunting.

Well crap. This means removing the bumper to remove the winch, lights, antennas or anything else ran in that area…. Oh well. I may take them off and store until the repair is complete.

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[Sandevino]

Well crap. This means removing the bumper to remove the winch, lights, antennas or anything else ran in that area…. Oh well. I may take them off and store until the repair is complete.

No need. Two bolts at the top of the grille hold it in place.

I’d leave everything as if if it were mine.

 

[@californiajeeping]

Wonder if they can do an install guide/video to assist us?

 

[Dougstdig]

Wonder if they can do an install guide/video to assist us?

Wonder if they can do an install guide/video to assist us?

????Assist us????
This isn’t a warrantee repair. It’s a safety recall. No idea why you would want to do this yourself.

 

[Rusty PW]

????Assist us????
This isn’t a warrantee repair. It’s a safety recall. No idea why you would want to do this yourself.

Think it all depends on what's all involved with the recall. Do they switch to a better pump, or just replace it with the same old pump. If it's the same old pump. Then this option becomes a reality

 

[@californiajeeping]

They’re going to have the same old pump with some hardening on the rollers or something lame.

some of us don’t trust a dealer to repair. I’d upgradetoday if they had a shade tree pump swap instructions

 

[my dog Trigger]

well here is a up date on my jtrd 3 months in dealer 3 times repurchase 3,000 dollars in car rental dealer decides to fix truck by replacing pump he said he herd this pump is better than the other ones.Up dated software, but not the recall replacement . however check engine light came on had to go to orilys cause dealer wanted it for 3 more days to diagnose, turbo malfunction, everything reset itself and no other problem so far. between my credit union and FCA cant get their act together talked to an atterney he said had to be two closed serviced recorded which is now WE SHALL SEE

 

[22EcoDs]

well here is a up date on my jtrd 3 months in dealer 3 times repurchase 3,000 dollars in car rental dealer decides to fix truck by replacing pump he said he herd this pump is better than the other ones.Up dated software, but not the recall replacement . however check engine light came on had to go to orilys cause dealer wanted it for 3 more days to diagnose, turbo malfunction, everything reset itself and no other problem so far. between my credit union and FCA cant get their act together talked to an atterney he said had to be two closed serviced recorded which is now WE SHALL SEE

Pretty sure you got the same old pump. There's no evidence yet between jt, jl, and ram 1500 forums that there's an actual documented new part at this time.

 

[my dog Trigger]

For sure that is what they told me at the dealer they said three months ago they could not put another one on because it was a safety issue three months later they put one on . Does not make sense

 

[@californiajeeping]

Looks like this is back as an option for me. Its basically lick and stick. You use the degree wheel to make sure its 100% aligned. Easy enough. doesnt say how to align the degree wheel? :

 

[sharpsicle]

Looks like this is back as an option for me. Its basically lick and stick. You use the degree wheel to make sure its 100% aligned. Easy enough. doesnt say how to align the degree wheel? :

It sure does tell you how to align the degree wheel. You make a reference mark prior to removing the old gear, and then align the new one with said reference mark.

 

[@californiajeeping]

It sure does tell you how to align the degree wheel. You make a reference mark prior to removing the old gear, and the align the new one with said reference mark.

You place the degree wheel on the pump.....is it up is 0? Do you align 0 with a notch on the pump?

It does not specify. How are you going to get the degree wheel on 2 pumps in the 100% exact spot? Should be clarified. Still easy to figure out.

 

[sharpsicle]

You place the degree wheel on the pump.....is it up is 0? Do you align 0 with a notch on the pump?

It does not specify. How are you going to get the degree wheel on 2 pumps in the 100% exact spot? Should be clarified. Still easy to figure out.

I mean, yes? You index it to a constant, whatever that may be. Some are keyed, some are not, but they all work the same way. You could even use your own index point so long as it's stable and repeatable. This is how these tools work. They're relative position tools, not absolute position.

 

[CrazyCooter]

Ya, it seems a bit vague to me too. Looks like a rough guesstimate.......

The gear could end up 1/2 tooth off and the pump could then rotate 1/2 tooth either way during install to line up with the cam gears? I think the big thing here is that the pump doesn't end up unloading at the same time as the rest of the valve geartrain is also unloading so a rattle doesn't develop?

I remember my 3rd gen Cummins having a rattle from the front cover at times that people were rotating the pump gear 1/3 of a turn to correct it.

 

[Terminus33]

Turning something 100 degrees is 100 degrees, whether you reference the start from 12 o'clock or 8 o'clock it will turn the same amount.

But isn't it weird that every modified fuel pump they have on that website is $999.99 exactly?

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