[Vwdiesel] More Quantum Questions? Injection Pump

[mark shepherd]

Bill,
I have to say you need to stop running around like a headless chicken, and 
throwing your good money around as likely as not, uneccessarily :o)
 I can't believe that the pump has been broken by your seal change. I just 
think you've made a simple mistake somewhere [don't we all]...

 Are you saying that the gauge adaptor extension inner actually preloads the 
gauge by 2 mm? This should not happen as the extension should be free to 
poke out.

Are you saying when assembled and then screwed into the pump, the gauge 
moves 2mm or so? This can be fine, and you just turn the gauge face to zero 
again.
Are you getting this at TDC? If so then turn engine anti clockwise so that 
the  gauge needle drops off and then stabilises. At this point rezero the 
gauge, but be sure that the inner little  gauge has not bottomed out.
[This is the preload bit]

You then move engine until TDC appears on the flywheel noting the movement 
of the gauge.
This should read 1mm. Bear in mind that the total possible piston thrust of 
the pump is about 2.3mm.

If at TDC you have a larger reading than 1mm then loosening the pump bolts 
and the fuel lines, grab hold of the pump top and pull it away from the 
engine. This is 'retarding ' the pump. If your reading was only 0.8mm 
though, then push pump top towards the engine.

The 'spaceship' on top of the pump is the LDR  or fuel boost restrictor. It 
is connected to the inlet manifold by an air line because there is a 
diphragm inside the LDR  that pushes down when the turbo boosts the inlet 
manifold air pressure and it controls the amount of extra fuelling 
available. It actually restricts over fuelling, and can be adjusted to suit 
your driving style.
When looking at TDC, be sure that valve cam lobes are sticking up in the air 
when you do a fuel pulse test to ensure pump isn't 180Deg off....

Regards,
Mark

----- Original Message ----- 
From: "William J Toensing" <toensing at wildblue.net>
To: <vwdiesel at vwfans.com>
Sent: Sunday, March 15, 2009 4:27 AM
Subject: [Vwdiesel] More Quantum Questions? Injection Pump


>
> Reply to Mark Shepherd, post of 3/5/09. Today, 3/14 was the first chance I 
> had to work on my Quantum's IP.
> I do have a dial for the IP which I bought on eBay from Germany. It reads 
> from 0 to 10 mm in .01 increments & came with an adopter which screws into 
> the back of the IP & an extension. There is a set screw at the end of the 
> adopter to lock the gage. However, I suspect the extension may be 2 or 3 
> mm to long as I have to push the gage's shaft into the adopter to where it 
> reads 2 mm before the lock nut holds it. This is the first time I have 
> used this gage so I am not sure if I am doing everything right.


>
> In following the Quantum Bentley, page 23.4 instructions, I preloaded the 
> gage to 2.5 mm & then turned the engine contra clockwise. The gage would 
> not move. I then set the engine at "0" TDC & turned the engine clockwise 
> with the gage set at 3.0 mm while at TDC. The gage then advanced to 4.75 
> after 3 gear cogs past the TDC timing mark on the IP & would not go 
> higher. When I advanced the IP 2 cogs past TDC, it read 1.5 mm.
>
> I suspect I may have messed up my IP when I did not remove it from the 
> Quantum to replace the "O" ring referred to in prior postings. The person 
> I bought the IP repair kit "O" from, "George, the diesel guy" from 
> Georgia, advised removing the IP from the Quantum & placing it upright in 
> a vice before replacing the "O" ring.
>
> I marked the "O" or TDC mark on the flywheel with a marking pen & noted 
> the flywheel rotates twice for every one rotation of the IP. Is this 
> correct? I wonder if I could have got my engine 180 degrees off after I 
> had the head off? However, it did run after I replaced the head & before I 
> replaced the "O" ring on the IP to stop the leak.
>
> If some of you would email me your phone number, if you live in the USA, I 
> would like to talk to you re this & possibly other issues. Please let me 
> know when it is convenient to call & your time zone. I have phone service 
> which does not cost me to make long distance calls inside the USA.
>
> I would also be interested in buying a good used IP for my '82 Quantum TD 
> if it doesn't leak & is reasonably priced. Let me know what you have. I 
> notice my Quantum's IP has "something" on top that connects to the intake 
> manifold to compensate for the turbo boost. Again, what turbo diesel IPs 
> are interchangeable without modification? I understand older non-turbo IPs 
> will work but I prefer one set up for my car which does not require 
> modification.
>
> Bill Toensing, Nevada City, CA
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