[T3] fan rubbing something

[Jim Adney]

On 16 Feb 2016 at 1:38, Soren Jacobsen wrote:

> On 02/15 21:03, Jim Adney wrote:
> > 
> > Most of our engines came with pumps with 21 mm gears [...]
> 
> And the early ones (prior to June 1967) had 21mm gears and 6mm stud
> holes on the pump body.
> 
> Having said that, I'd now like to do a bit of begging: does anyone
> happen to have an original early (6mm stud, 21mm gear) VW oil pump
> they're willing to sell?  

Good luck with that, Soren. I believe even Berg was unable to find 
them 20 years ago. Nevertheless, someone may have one sitting in his 
basement for all these years.

> I recall years ago reading a blurb from Gene Berg about how difficult it
> was to find suitable OE VW oil pumps.

Berg also did a writeup on how to take a used belt sander to a belt 
grinder and carefully sand down the body to take out any end play. If 
you do this with the gears installed, that will keep you from going 
too far. Installing the gasket will give you the necessary running 
clearance. Of course, this will do nothing for the side clearance, 
but that is seldom a problem, except for excess side clearance where 
the shaft passes thru the body. I suppose that could be sleeved, but 
that's a rather extreme measure.

I have a number of pump covers that I have milled and run on a 
surface grinder to remove wear there, but I'm afraid all of them have 
8 mm holes.

Note that the shaft is a press fit in the gear, so you need to check 
to make SURE the tang fits suitably in the cam gear: not too deep, 
not too shallow. It can be pressed in or out to get a perfect fit. 
And make sure the tang was machined symmetrically. I got a bad one 
from Berg many years ago. Berg replaced it without comment, but it 
still caused an extra teardown of that engine.

And finally, one more note on oil pumps: VW didn't always put the 
inlet and outlet holes in exactly the same places. Believe it or not, 
it's possible to install an oil pump whose inlet hole does not match 
up with the passage in the case. That makes for a perfect looking 
installation that pumps NO oil. This is something you MUST check when 
assembling an engine.