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#30
by
fatmobile
on 24 Sep, 2020 23:06
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Whaa I just updated it in the post before yours.
He called me today.
The hub seems to be brittle.
He removed it to put it on the machine.
When he went to put it back on somehow was using the sprocket mounting holes to hold it in place and the thing cracked.
We can all learn from others mistakes.
He ordered a new hub and I should have it back soon.
He couldn't tell me why the RPMs kept hanging.
He also put the old lever back into it.
He of course couldn't tune it to TDI specs because they are in milivolts or something.
Probably should be tuned to the specs of the AAZ pump.
Anyone have pump numbers for that one?
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#31
by
fatmobile
on 25 Sep, 2020 12:43
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Bosch service center guy said my internal pump pressure was way too high and could crack the pump.
79.77psi @ is probably double what it should be at 1000 engine RPM.
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#32
by
libbydiesel
on 25 Sep, 2020 13:35
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Bosch service center guy said my internal pump pressure was way too high and could crack the pump.
79.77psi @ is probably double what it should be at 1000 engine RPM.
I wonder if that is a discrepancy between crank rpm and pump rpm (1/2 crank).
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#33
by
fatmobile
on 25 Sep, 2020 23:50
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Might be.
Here's the quote from reply#22 in this post.
Copied some from the M-TDI pump info thread:
"It is sufficient to perform measurements at 1000 rpm and at 4000 rpm.
The pressure at 1000 rpm of the ENGINE should be about 5.5 bar, at 4000 rpm-9 ... 10 bar."
5.5 bar is 79.77psi so I have that at about 2000 RPM instead of 1000 like it's supposed to.
So it's supposed to be close to what the 1.6 uses.
About half that.
Glad I didn't crack the pump.
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#34
by
ORCoaster
on 26 Sep, 2020 22:58
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What? Why am I confused?
In reply #32 you state your IP pressure of 5.5 bar is twice what it should be. Then in Reply #34 you say you have 5.5 bar at 2000 RPM instead of at 1000 RPM.
A lower RPM would equal lower pressure at idle, yes? So is your idle pressure 3.5 and the higher 2000 RPM is 5.5? This isn't making logical sense to me.
But then somethings never do.
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#35
by
fatmobile
on 28 Sep, 2020 01:39
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That whole section is a repost from post #22.
When I was reading specs from the MTDI info thread.
I brought it back, reposted it as wrong.
Wasn't as clear as I could have been.
Thanks for pushing me to clear that up.
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#36
by
fatmobile
on 06 Oct, 2020 20:00
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Got the pump back.
The RPMs still hang, it doesn't seem to climb as much just hangs..
He mostly dealt with things inside the pump.
Nothing with the high pressure head.
Something weird I noticed:
When I was priming the pump with a vacuum pump on the "OUT" banjo, it wouldn't prime.
I heard a hissing and it was coming from one of the delivery valves.
I pulled the cap and I could prime the pump if I covered the delivery valve with my finger.
Turned the pump 90 degrees and it did the same thing on the next delivery valve.
Even weirder yet, it was number 4 (bottom left) that was sucking in air when the pump and engine were set at #1 (top right).
There was no power to the pump.
I haven't noticed this before.
I don't know if it was because I always had the injector lines on before I primed the pump.
Or maybe the screw-on caps sealed the delivery valves.
Hard to believe after all the pumps I've primed this way that this would be normal and I wouldn't have seen it happen before.
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#37
by
libbydiesel
on 06 Oct, 2020 21:46
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I haven't seen that before either although I typically install the lines onto the delivery valves (loose at the injectors) before priming the pump.
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#38
by
fatmobile
on 07 Oct, 2020 12:42
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I'll try powering it up and turning it with a wrench and see if it's still pushing out fuel on #1 when it's at TDC.
Because it's weird that it leaks on 4 when the engine is at 1.
Also wondering if the plunger might be bad and air/fuel is leaking past it.
Has been a couple time that I shut it off and it didn't shut off right away.
Also times when I rev it and it kills just stops.
Thought it might be that butterfly in the intake shutting,.. but reved it in the engine bay and it killed
but that didn't move.
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#39
by
Chuck1978
on 07 Dec, 2020 19:03
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Did you find any resolution to your pump issues? It sounds like it was running pretty well aside from the odd running condition issues with revving it just killing it outright. There seems to be some internal issue going on without a doubt I'd guess.
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#40
by
fatmobile
on 07 Dec, 2020 20:48
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I'm putting a timing belt on a 2003 TDI.
I'm going to swap this pump onto that engine and see if the problems move with it.
I can't see how these problems could be caused by the engine but
this should rule it out.
I see I haven't posted the numbers on the pump.
Sometimes I wonder if it's a left handed pump.
Here's a pic of the plunger next to the 1.6 plunger.
I can see all the way through the holes on the end.
Flicker is upgrading or something.
I'll post them later.
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#41
by
fatmobile
on 13 Jan, 2021 23:25
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I put the pump in the 03 TDI Jetta wagon,..
and it did the same thing in.
I put it back in the Golf and swapped delivery valves.
Still had hanging RPMs.
I'll post the pump numbers.
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#42
by
libbydiesel
on 14 Jan, 2021 19:32
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Well, that was a good test. It pinpoints the pump as the issue.
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#43
by
fatmobile
on 30 Mar, 2021 00:05
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Bought a pump from Andrew Libby.
It's spinning tires and burning clutches like it should.
Runs great.
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#44
by
libbydiesel
on 30 Mar, 2021 17:15
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Excellent!