[Vwdiesel] More Quantum Questions?

[mark shepherd]

Bill,
You're not doing much wrong...
Locking the pump is only necessary when you've been driving for some time, 
and you decide to change the timing belt as part of a service, and where you 
are otherwise happy with the running of the engine. So leave pump  lock bolt 
out ;o)

Possible 'errors'
Because you go anti clockwise , presumably to find the low area between the 
pump injection cams,  be sure to turn CRANK 2 revolutions [to get you back 
to where you are setting the timing on #1], AFTER you have set the pump to 
what you believe is 1mm on the gauge. Do this leaving gauge in place. It is 
done to re position the 'slack' in the timing belt where it will be when the 
engine is running, which is down by the tensioner. REMEASURE dial reading, 
which should be 1mm again. Actuallly, doing this 2 revolution operation, 
straight after inserting dial gauge will improve correlation between the 2 
measurements.
As as check on your gauge, and 'are you reading it correctly', as the gauge 
passes over the 4 pump cams , it should reach a maximum of about 2.3mm.

IF your injectors are set to 155bar, or there abouts, 1mm is about correct. 
If you know they are a little lower, then '0.9 something  or other' may  be 
better, ie pump top pulled away from engine.

If  this doesn't  improve things, then I have a few  tricks up my sleeve in 
reserve :o)

Mark



----- Original Message ----- 
From: "William J Toensing" <toensing at wildblue.net>
To: <vwdiesel at vwfans.com>
Sent: Thursday, September 16, 2010 10:31 AM
Subject: [Vwdiesel] More Quantum Questions?


>
> Followed advice of using a jumper from battery. Seemed to help a little. 
> So I then installed a Ford type starter solenoid from the battery to the 
> glow plugs using two 10 gage wires, one to the front glow plug & one to 
> the rear. At first, after a couple tries, it started right up. Warmed the 
> engine up & turned it off & tried to start it with no success. Acting the 
> same as always. Rebuilt IP, new glow plugs, checked injectors which seemed 
> OK, new filters. When I first bought  the Quantum it would always start 
> but overheated, had head redone, valves done. Then started right up but 
> the IP leaked. I did not replace the injector washers with new ones. Have 
> gone thru the timming sequence several times. New battery with battery 
> kept at full charge with a battery tender. Starter turns engine over fast. 
> Fuel seems to flow thru IP OK. Once it starts it runs fine. If I coast 
> down a small hill, it will start.
> Re timming, I bought a rather expensive dial gage that is calibrated in 
> metric. I am wondering if I am using the gage right? I will set the 
> flywheel at TDC, loosen the cam gear & tension pulley, lock the rear of 
> the cam & the IP per Bentley. Then tighten  the tension pulley & then the 
> cam gear. I will then rotate the engine contra clock wise, per Bentley. 
> Then I will insert the dial gage in the back of the IP. Then  I will 
> rotate the engine clockwise until the gage makes one complete circle & 
> then lock the IP in place & I find the flywheel shows TDC. I have tried 
> moving the IP a little bit clockwise & contra-clockwise but no change in 
> balky starting, only a change in diesel knock as I move the IP slightly 
> contra-clockwise.. Am I doing something wrong? I want to fix this Quantum 
> myself. I don't know anyone locally who knows more about VW diesels than 
> me but if one more attempt at re-timming doesn't work I will have to start 
> looking for someone
> Bill Toensing, Nevada City, CA.
>
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