[Vwdiesel] Need Oil Pump Help

[LBaird119 at aol.com]

> (1) What oil pump should I order for this non-turbo engine?  Should I
> stick with a stock pump (26mm) or is there some reason better to go
> with one of these higher volume pumps (30 or 36 mm)?  I could use some
> help in specifying the correct pump.

  26mm is standard but I'd be inclined to opt for the 30. If you end up with 
a leaker bearing, such as the int. shaft bearings tend to do, it'll 
compensate 
better.  Also you should get a little faster oiling on startup.  It's a 15% 
increase over the "stock" pump.  I believe VW went to the 30 mm pump 
in the 80's somewhere (still on A1's).  26 will do, 30 shouldn't hurt. : )
  I've put the 36mm pump in for a couple reasons.  The makeshift 
oil squirters I've done on the Rabbit have no low pressure shut out 
so I need more low rpm volume.  The jetta had a 30mm pump, it 
was worn as were a lot of internals from the circulating metal from 
the ground up thrust surface.  With actual squirters plus a turbo, I 
figured it wasn't all that much overkill.  It IS when my oil usage 
problem started but it only exacerbated a symptom rather than 
being the probem.  I now have almost 15K on the last re-ring 
(with ME honing this time) and NO oil smoke startups. :)  :) 

> 
> (2) Does anyone know how much clearance should exist between the oil
> pump shaft and that top bushing in the block up near the vacuum pump?
> Is it important for this clearance to be low or is it non-critical?


  You talking like the relationship between a piston and the bore or how 
"long" the shaft is?  Since you were able to shim something was it the 
relationship of the shaft to the vacuum pump or (me tired brain thinks 
more likely you're saying) with the oil pump installed, the upper shaft 
support bushing is out of whack.  That might be a bit of a buggar to 
fix without a mill, or making is sloppy.  It's a pressure oiled bushing 
I believe so there's where the bigger oil pump comes into play.  ;-)

> 
> (3) The intermediate shaft pulley has about 10 degrees of play.  Is
> this excessive?  What is normal play?  Does this mean that I should
> replace the vacuum pump?
> 

  Change the pinion depth!   You could check for gear wear but they 
usually don't show that much.  If boring your bushing properly would 
put the top of the shaft a bit closer to the int. shaft then that would 
eliminate some of the play.  At least the vacuum pump timing isn't 
critical.   ;-)  (Of course we don't tell the rookies that though)  ;-D

  If you replace the 36mm pump (which IS overkill on a non hydraulic 
and non TD engine) may I have first dibbies on it?  I need one for my 
son's Dasher.  Should be getting the turbo stuff this week and his 
BD is a week from now.  I need to put a 36mm pump on it to make 
sure the turbo gets oil at an idle.  : o