I am converting my truck to a P pump. I dont have it totally apart yet, and so havent looked closely at the timing housing and pump mount.

Rather than get a timing housing from a 12V, can I machine my existing housing to fit the P pump ? What is the difference, bolt hole locations, bore of the pilot, position of the shaft centerline ????

If the shaft centerline is indeed different, then the timing gears are also different ??

Kp

 

I dont know of anybody that tried to use the 24v cover, the mounting studs for the pump are different , you need a 12v cover and mod the timing pin hole to fit the cam sensor in it with a special CNC adapter to place it in the right location.


Brett

 

I believe 12Valve had a friend that machined the 24v case. Spigot hole is larger for the 12v, I believe the bolt pattern is also different, and the VP has a dowel at the bottom that the P7100 does not. If it can be machined to fit, it should work good. The gears are indeed different, but the centerlines should be the same, as the gears still need to be the same size for correct timing. VP gear is keyed to the shaft, whereas the p-pump has no key, it is just a taper fit that holds it on.

I should be able to help you out on some measurements, I have my 12v engine without the pump on it, and I have my old 24v case kicking around, I can do some comparisons. I'll try and get that done today.

 

Excellent !!! Well since I have gathered only the Pump gear needs to be changed, and that as you state they need to spin the same speed as before, then the centerline is indeed the same. And since the spigot is larger, its really easy. I can just indicate of the existing spigot and bore to the proper size. Bolt hole locatations can then be transfer punched after the spigot is in.

What is a good source for the pump gear ??? And am I correct in assuming I only need a pump gear, or is the pitch and/or herringbone different, such that I need to change both the cam gear and the pump gear ??

 

Pitch is the same on the VP and p-pump gear. Still meshing with the same cam gear. Check e-bay, back when I was looking for parts, there was lots of gears and cases and the like there.

I'll go look at the cases (need to go rip the head off of my new 24v out there), hopefully there is enough meat for the bolt pattern, as I'm not sure how wide either of them are. Hopefully they are far enough apart that you won't be drilling half way into an existing hole, but you can always run a plug in, stake it, then drill.

 

Any news on this? Kinda curious, I don't like my ticking time bomb anymore

 

Probably wont be any updates, 600 megawatts is a muted user now.

 

What the heck is a muted user? Oh no, don't hit the mute button...

Dusty got banned recently too I think? Man, people are dropping left and right!

 

so many 24v conversions have been done over here, that 12v covers are hard to come by, so yeah the 24v housing can be machined to fit a p pump on there.

 

I'm still in touch with him. He's gotta pick up some odds and ends yet before he'll be running, but the bulk of it is done he says.

 

So he was able to modify the 24V housing? What exactly needs to be done, or at least some photos? I've got access to a full machine shop so it'd be easier/cheaper to modify my housing than to buy one. I'm also pretty sure I'll never have a need to go backwards and put a ppump back on

 

He ended up getting a 12v case. Easier, less time involved, and less worry about alignment issues with the cam gear. You can pick them up off of e-bay for a decent price, and you have to pull the housing anyway, so it just makes sense to me.