ABL engine code Injector Pump timing question....

[vwt4]

ok guys, I am hoping someone can confirm this query one way or the other please.

The vehicle is a VW T4 transporter, 1.9 TD engine. Engine code ABL

Basically, I am wanting to know if the pump is able to be fine tuned by the method below?

I thought it was timed by locking it in the correct position, however I have been told different things by several knowledgeable people so Im a bit confused!!

Basically, can I lock the pump and dial gauge 'fine tune' it for max performance!!! Or is it non adjustable except for having it reconditioned?

Thanks






[/QUOTE]

[Vincent Waldon]

Locking everything at TDC allows you to get the timing belt on the correct teeth.... but to actually set the injection timing to factory specs a dial indicator is used and the injection pump rotated slightly.   The specs are in thousandths of an inch so it's a bit of a precision game... at least from VW's perspective.  From that perspective the timing is fully adjustable.

Here's another take on the procedure with some pictures that may be helpful:

http://vincewaldon.com/index.php?option=com_content&task=view&id=24&Itemid=28

[arb]

That is almost how I would do it... what I would change, find the timing required for your engine (My Bently is at home).... That range of 0.015 mm is enough to change your performace / economy quite a bit.

Also, after you turn it back to TDC to verify "0", I would not install the locking pin / bar. I would tighten the IP bolts and repeat the process after turning the engine over a couple of times in the operating direction.

[Baxter]

ABL's are set like the later Golfs with the AAZ.
They have what is basically a vernier pulley on the injection pump drive.
It's set by pegging the pulley at TDC, slackening the 3 hub bolts on the pulley and moving the pump drive with a spanner to achieve the right timing reading.

[vwt4]

ABL's are set like the later Golfs with the AAZ.
They have what is basically a vernier pulley on the injection pump drive.
It's set by pegging the pulley at TDC, slackening the 3 hub bolts on the pulley and moving the pump drive with a spanner to achieve the right timing reading.

Thanks Arb and Baxter...
but Im even more confused now  :lol:

baxter, are you saying that its not adjusted with a dial gauge and adapter?
I know about the adjustor bolts but how do you know where to adjust to?? Surely not trial and error?

[vwt4]

Locking everything at TDC allows you to get the timing belt on the correct teeth.... but to actually set the injection timing to factory specs a dial indicator is used and the injection pump rotated slightly.   The specs are in thousandths of an inch so it's a bit of a precision game... at least from VW's perspective.  From that perspective the timing is fully adjustable.

Here's another take on the procedure with some pictures that may be helpful:

http://vincewaldon.com/index.php?option=com_content&task=view&id=24&Itemid=28

Thanks Vincent.

For some reason I missed this earlier.
I will read your guide now and post back if/when I have any questions if thats ok :lol:

Also, is it just me or is your very informative webpage's html not displaying correctly?

<if> <endif>

<if>-         <endif>valve cover gasket

<if>-         <endif>depending on the length of your dial gauge adapter and dial gauge you may need to remove the vacuum pump.  If so, replacing the vacuum pump o-ring is a good idea

<if> <endif>

<if> <endif>

[Baxter]

Basically th procedure is the same, with the same tools but instead of rotating the pump to achieve the right reading on the gauge you move the hub of the injection pump relative to the sprocket.
I don't think that the mounting holes in the pump are elongated.

[Vincent Waldon]

<if> <endif>

<if>-         <endif>valve cover gasket

<if>-         <endif>depending on the length of your dial gauge adapter and dial gauge you may need to remove the vacuum pump.  If so, replacing the vacuum pump o-ring is a good idea

<if> <endif>

<if> <endif>

Yup, about once every couple of months someone lets me know that on their particular browser, computer, phase of the moon etc the pages are not rendering properly... my web hosting company has never been able to track it down.  If you could PM me what browser and OS version you are using I can continue to pester them for a solution... thanks muchly.


In terms of pump timing... you can check the pump sprocket... if there is one central bolt and three smaller bolts then you don't need a dial indicator as the pump is pre-timed... per Baxter's earlier posts here.  If you just have a single central bolt on the pump sprocket then the dial indicator method applies.  I should also update my pages now that more people are playing with more recent pumps... in the old days it wasn't much of a factor. ;-)

Ask away!!





Vince

[regcheeseman]

I've just took delivery of one of these weird vernier equipped pumps. Just the pump.

When I fit it to my motor, I need to get the pulley at least in the right ballpark position prior to getting the DTI gauge out of the box.

As it's lacking the locking pin facility I'd normally use, what marks are on the pump to facilitate the basic setup?

I've done a search and Baxter seems to be the only one with much experience of these, is it a UK issue?