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LR and 1.9 pump
by
rodpaslow
on 05 Feb, 2014 08:09
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I've stripped both pumps, not much different other that the governor, shaft head and camplate. I thought I'd share a couple pictures:
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#1
by
rodpaslow
on 05 Feb, 2014 08:10
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#2
by
rodpaslow
on 05 Feb, 2014 08:14
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The shafts are 17 vs 20, the end of the LR pump has a non-removable spring vs the 1.9 17mm shaft without.
the above picture shows the LR governor with is somewhat different as well. This was sold to me as a 300 tdi, but it's only a 11mm head, not 12 which I was hoping for - I think its a 200 tdi.
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#3
by
rodpaslow
on 05 Feb, 2014 08:18
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I have one question - before putting the camplate in backwards, which way does the camplate go in? Does it go so the relief in the piston when you put the head back on is facing to #1 cylinder delivery valve?
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#4
by
libbydiesel
on 05 Feb, 2014 09:37
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All the LR pumps I've seen have the 11mm plunger/head. The LT and Cummins 4BT pumps have the 12mm plunger head.
On the control lever assembly, compare the pivot hole to lower rod distance on both AAZ and LR pumps. Also, compare the accelerator shaft to spring capsule pivot point offset and the dynamic advance overall distance (cap), spring rate and spring pretension.
WRT the camplate, the pin/cutout should align with the woodruff keyway in the main shaft.
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#5
by
rodpaslow
on 05 Feb, 2014 10:17
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I have compared the control lever length - lower rod distance, as suggested, and the control lever pivot to end (ball that fits control ring) is longer than the AAZ, which it needs to be for TDI. I hope I can use the LR lda, as the spring assembly on the AAZ is just crazy.
I also notice the camplate has much sharper lift profile, but not as high as the AAZ. I will compare the accelerator shaft pivot point offset, but if I use the LR parts and LDA, should I not be able to use the LR shaft - that was my thinking.
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#6
by
libbydiesel
on 05 Feb, 2014 13:32
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If you're trying to build an mTDI pump I would just use the LR pump complete. Is there an issue with the bottom half?
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#7
by
rodpaslow
on 06 Feb, 2014 05:34
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No problems with the bottom half, I just wasn't sure how I was going to deal with the timing belt pulley. Since I have it apart, the machine shop I work at will slot the holes for free in the pump body, and machine the bracket (as its a 1Z out of a passat), so I will likely use the LR pump complete.
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#8
by
libbydiesel
on 06 Feb, 2014 07:07
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Assuming this is going on an AHU/1Z/AFN, you will need to enlarge the hole in the pump bracket to fit the larger snout. Instead of slotting the holes, I would get an ALH pump sprocket and hub. It is bolt-on and makes for much easier timing adjustment and no line stress/bending.
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#9
by
rodpaslow
on 06 Feb, 2014 08:06
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I had originally planned on doing that, I know it would make for easier adjustments - do you know where I could get one? I've also heard if I change delivery valves it would amount to less fueling (if I put VW tdi del valves on) so I will keep the LR delivery valves on. It's also been suggested that the LR pump has a very low RPM governor. So would it be better to use the AAZ governor, or just to the governor mod suggested in FAQ?
I've read and seen success on utube using LR pump as, I like to build this engine into a bit of a performer so pump, injectors and turbo are the bits that will help that.
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#10
by
vanbcguy
on 06 Feb, 2014 16:58
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I was able to get the pulley and hub just by posting a "want" ad over on TDIclub.
I think the LR governor is 4k+ RPM. Governor swaps between pumps is probably a nono, there are a gazillion different configurations of pump internals specifically around the governor parts. But I'm not sure that the LR one is actually an issue (yet).
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