1955 12 Valve NAPCO Clone

[1985-GMC]

It still works for me

[XJAbuzer]

Working now. Sounds good.

[Luther Grimace]

I think SOUNDED good is the key word
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[XJAbuzer]

Originally Posted by Luther Grimace

I think SOUNDED good is the key word
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Yeah..lol

[Luther Grimace]

Here is a little update from the weekend. I got a 55 seat from a good guy from down in Birmingham that helped me out. Needless to say I didn't get much done beside the seat. I was too depressed after the injection pump died on me. Still not certain if I am going to let a diesel shop rebuild it or if I will do it myself. I cannot stand letting someone else work on my engines or transmissions.

You can't see the bench bolted in there very good but I am glad to have one now so I don't have to spend time making brackets.

[6BT 56]

Have you been looking into what is involved in rebuilding the inj pump? I have wondered myself. Once mine is on the road and some bugs are worked out I want to do the fuel pin govenor spring etc.

[OrrieG]

Just glancing at the photos I thought you were inventorying mouse turds....

If that is the original paint can you post the paint code off the door jamb data tag. Thanks is advance. No hurry.

[Luther Grimace]

Yeah I have been doing some studying up on it. I bought a DVD off ebay that might tell me alittle bit too. I figure dieselwrencher might have some horror stories about folks doing it themselves.

Here is a good write up.
http://gnarlodious.com/Vanagon/Bosch_Pump/-Rebuild

[Luther Grimace]

Originally Posted by OrrieG

Just glancing at the photos I thought you were inventorying mouse turds....

If that is the original paint can you post the paint code off the door jamb data tag. Thanks is advance. No hurry.

Haha! I worry about them falling through the rusted floor so I have to keep a check on them. Are you talking about the interior paint or the green?

[Dieselwrencher]

Originally Posted by Luther Grimace

Yeah I have been doing some studying up on it. I bought a DVD off ebay that might tell me alittle bit too. I figure dieselwrencher might have some horror stories about folks doing it themselves.

Here is a good write up.
http://gnarlodious.com/Vanagon/Bosch_Pump/-Rebuild

I have heard several stories about them blowing up because guys didn't assemble them correctly. But, as long as you mark everything exactly how you remove it, and lay it out in order, you should be able to get it done.

[Luther Grimace]

Finding the bad part to me will be the hard part.
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[6BT 56]

Ah the simple days. A blind monkey can rebuild a Holley .

At least these things only need 1 wire to run ! Like the HEI of Oil burners ...

[OrrieG]

Originally Posted by Luther Grimace

Haha! I worry about them falling through the rusted floor so I have to keep a check on them. Are you talking about the interior paint or the green?

Exterior, should be a three number code on the big data plate (at least my 59 has one there).

[Luther Grimace]

Orrie I haven't forgotten about you. I will get it tonight. That is not the original paint color though. You can see pieces of the original dark green under that paint. You can see pieces under the fuel filler neck.

I pulled the injection pump off last night and am going to tear it down tonight. Heres to hoping the problem is evident and cheap.

[Dieselwrencher]

Good luck with it. If it needs major parts, just let me know....

[Luther Grimace]

Well it is apart. My only casualty was a stripped torx screw that bolts the pressure plate for the feed pump to the body. I didn't have a long enough torx screwdriver so I improvised and messed one up.


I don't really see anything out of the ordinary except the condition of the rollers and the camplate seemed poor. They are rough and pitted.





At this point i'm really at a loss to think what could be wrong. The vanes on the pump seemed to be in good shape and the stator was in good shape as well. I thought maybe the pressure regulator but this seems to be a high pressure problem more than the internal pump pressure being low. I noticed I had alot of fuel puddled up in here. It had just started leaking out the vent before I installed the other long block.

[6BT 56]

Yep. Needs horizontial bearings for sure. Thermo coupling looks bad aswell. I'd shim the main shaft 0.002 and try it. If that dont work apply at least 2 full cans of mexican chrome bumper paint. Then put it in a box , mark CORE on it and send it to a shop that can send you a new one....

Not what you wanted to hear I guess. Lol. Your a braver man than me Luther. I'd put it in the box and ship it for sure . What parts are included in a rebuild kit? Is there even such a thing ?

Keep pluggen away ! Your so close now !!!!

[Luther Grimace]

Originally Posted by 6BT 56

Yep. Needs horizontial bearings for sure. Thermo coupling looks bad aswell. I'd shim the main shaft 0.002 and try it. If that dont work apply at least 2 full cans of mexican chrome bumper paint. Then put it in a box , mark CORE on it and send it to a shop that can send you a new one....

Not what you wanted to hear I guess. Lol. Your a braver man than me Luther. I'd put it in the box and ship it for sure . What parts are included in a rebuild kit? Is there even such a thing ?

Keep pluggen away ! Your so close now !!!!

I would put in a box and send it somewhere but a new pump costs about twice to four times as much as i paid for my used long block.

The rebuild kit includes all the seals, o rings, and copper washers. No hard parts just consumables. I wish I could guarantee I have found the problem somewhere but I can say that I have not.

[OrrieG]

Originally Posted by Luther Grimace

Orrie I haven't forgotten about you.

No hurry on my end. You have lots of pieces to keep track of!

[Luther Grimace]

It was really not that bad to take apart. If I had to rate it i would say harder than a carb but easier than an automatic transmission. The diagnosing is the hard part.
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[Luther Grimace]

Office I couldn't find that tag? Where did you say it was at again?
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[OrrieG]

Originally Posted by Luther Grimace

Office I couldn't find that tag? Where did you say it was at again?
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Here

[Luther Grimace]

Mine doesn't have any info there. Just more gvw ratings.
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[OrrieG]

That's ok, thanks for looking. Now get back to the injection thingy.

[Luther Grimace]

Here is an update from this weekend. After talking with some guys on a Cummins board after I had run out of ideas one of them recommended the plunger return springs. I hope to replace them and see what happens. Just waiting on parts now.

After compression


I also got my new downpipe made. I have an FL60 Freightliner manifold I got from Dieselwrencher but it still was gonna hit my firewall with my stock downpipe so I did some slight modifications and got it to work. Thanks again to Dieselwrencher.






I also started on my bed mounts. I welded some angle to the bed to mount the bed to the frame and then started on the angle for the bed floor. I have to run it alittle raised up since the dodge frame isn't flat. Any recommendations on how to make a board swing up to gain battery box access?






I also started on cleaning up the gauges a little. All I did was sand the chrome down on the bezel cause it had a bunch of pops in the chrome and also cleaned the plastic lens. Then I sanded down the gauge face and repainted it black. I hope to get it put back together tonight. I have to start wiring soon. I need to figure out which wire to tie into my main power feed for the system.