Author Topic: ok to use injection pump td plunger,delivery valves in na distribution head?  (Read 2084 times)

September 03, 2011, 07:27:27 pm

damac

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I am grasping at straws here because I am no techie and tried to make a good sound pump to reseal and use.

I started with an na body and left all the parts except for the governor arm assembly because the na one wouldn't let me just drop the arm I had on the top like my turbo pumps, so I could mate my arm to my turbo top.

I also used another turbo pumps plunger because it was slightly longer than the na?

And I used the delivery valves from the turbo pump because they were also slightly larger to fit the hard lines.

So I left all the other stuff and just resealed everything.

The car is just acting really wierd as I am trying to bring it back to life.  I suctioned through the in bolt placed on the out port to get fuel in and then it took me running the battery down to get 3 of the injectors to seep.  Can't get a drop from the last one as of now while I recharge the batteries.

I came across somebodies post through google about the distribution head and the plunger being a mated pair and I didn't even think of it at the time even though they look the same to me from the outside.  Is there perhaps some internals that are different and messing with the flow?  The car is barely trying to fire once in a while and now I am freaked out about what I did.

Did I do ok in leaving all the rollers, camp and flyweights from the na pump in there, I could have sworn I read it was ok :(

Thanks for any info!
1985 turbo diesel jetta

Reply #1September 04, 2011, 05:22:45 am

burn_your_money

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the distribution head and the plunger being a mated pair

Yes they are.

That said however, try winding in the max fuel screw a bit and see what happens.
Tyler

Reply #2September 04, 2011, 11:26:02 am

damac

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Well I didn't notice that before but it looks like the holes in the turbo top castings are not the same between my 2 pumps.  One had a fuel screw the same as the na pump, and the original from my jetta has a larger one.  For the heck of it I compared the length since all lock collars are in place and the current pumps does not go inside as much.

For fun I grinded the collar off and set it to same length as the other turbo pump and started it up with same low and high speed stops and governor arm position I scribed before taking apart and it idled, maybe a tad low, but it sounded somewhat normal and reacted to throttle response. 

Although from experience I think I can tell its acting like the fuel is turned down just a tad.


So I am going to yank things apart and mate the distribution heads I guess, ugh more work.


On another note adding a turbo top to a na body is not as simple as I read.  I thought I could just change the top but quickly found I would be forced to do a complete teardown :(

The delivery valves were different length, the plunger setup was a different length and the arm that you set the governor linkage into usually with a turbo model in the slot when attaching the top, was one solid piece on the na model!
1985 turbo diesel jetta

Reply #3September 04, 2011, 12:20:38 pm

burn_your_money

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Just turn the fuel screw up. If it runs it runs. Although you may run into issues with hot starts in the middle of summer, or possibly a pump seizure. Your probably better to swap pump dist heads.
Tyler