Has anyone rebuilt thier own CP3 pump? I have seen a seals and bearing kit on Wicked Diesels website, is this a difficult project?
LLY: CP3 pump rebuild
- Thread starter Krazykid
- Start date
would you order rebuild parts from Bosch?? or http://www.turbocompressori.net/ ?? i just took a pump apart ant not much too it. It would be great if there was a diagram out there with specs. I'm interested in info on plungers and cylinders of the pump.
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Can't believe no answer with all the experts, come on guys enlighten us, my brain is only half full.:hug:
Alot of people think of the CP3 as a black magic kinda thing...and alot who don't would like everyone else to continue to think that way.
Whaat it boils down to is no one is really willing to divulge much info about these things cause they might lose their hold on that portion of the market.
JMHOP
Whaat it boils down to is no one is really willing to divulge much info about these things cause they might lose their hold on that portion of the market.
JMHOP
If all you're wanting to do is rebuild the pump, and it isn't weak in the pressure department, then just snatch up the kit from wiked diesels...its not really that big or hard of a job once you have it on the bench. Now, if you are wanting to modify anything in the main body, be prepared as that is the hardest chunk of cast steel you'll ever hold in your hand. 
If all you're wanting to do is rebuild the pump, and it isn't weak in the pressure department, then just snatch up the kit from wiked diesels...its not really that big or hard of a job once you have it on the bench. Now, if you are wanting to modify anything in the main body, be prepared as that is the hardest chunk of cast steel you'll ever hold in your hand.
I would like to modify, where do we start, I have 3 to play with.
I would guess you have to see what bosh has for parts in terms of larger pumps and figure out how to fit them in your pump. probably need to get there clearances and tolerances specs in order to machine your pump.
For increase in displacement, yes custom parts will need to be created. For optimization of the displacemet the pump already creates you will need speciality tools. The pump body is a solid piece of hardened steel. If you try to drill any of the passages even with a cobalt bit it just laughs at you and spits that cobalt bit out at you. In terms of where to start, all I'll tell you is think about how a person can improve the efficiency of a piston pump. :thumb:
WICKED DIESELS
you need more fuel
A CP3 can only be repaired for the DIY crowd, it is essentially the same as an engine that couldn't have the cylinders rebored. If the plungers or bores show long length wise scratches, then it will never build pressure. The plunger to bore clearance is what forms the seal, and it is very tight. Conventional maching measuring devices will not measure the small clearances. It takes super high precision tooling and equipment to do anything to correctly improve these pumps.
Although they are simple in design, the materials and clearances is what makes these things so difficult to work on. We can do larger plungers and bigger bores, but the cost does not make it worth while for most considering it, as a new complete CP3 cost less than just the machine work.
If you think about it logically, these pumps can generate well over 30,000 psi, they may seem simple but their is far more to it than that. As for the case, it is heat treated forged steel, nearing 60 Rockwell.
In a nut shell, a weak pump will most likely always be a weak pump. It can't easily or affordibly be helped.
Although they are simple in design, the materials and clearances is what makes these things so difficult to work on. We can do larger plungers and bigger bores, but the cost does not make it worth while for most considering it, as a new complete CP3 cost less than just the machine work.
If you think about it logically, these pumps can generate well over 30,000 psi, they may seem simple but their is far more to it than that. As for the case, it is heat treated forged steel, nearing 60 Rockwell.
In a nut shell, a weak pump will most likely always be a weak pump. It can't easily or affordibly be helped.
Just buy you a new one, they are only about $700 dollars and would have a warranty of some sort.
So a wore out pump on ebay is just that? I had considered picking one up cheap and putting the $$ in a rebuild. Just a thought though, haven't actually priced or researched the parts or their availability.
if your ponying up the $700 for all of us to own a new pump, Great sign me up. otherwise I think I will research the option to repair the one I got.
On another note: does a well worn pump fall into the category of a weak pump that will always be a weak pump?
Sorry for the rant.
If the regulator, cascade valve, gear pump and related pieces like that are all in good shape and the pump still struggles to make the pressure and flow required for something like a mild tow tune then the pump is shot, not rebuildable. This is a piston pump, and there are no rings or anything like that that can be replaced. If the pistons and bores are worn then the pump is pretty much worthless for anything except a paperweight or perhaps a core for someone to make an increased displacement pump.