T4 Oil Pump Comparisons, Stock . Schadek . Melling Options

[McMark]

I was looking for information on the stock T4 oil pump and couldn't find anything helpful. So I disassembled on of mine today and took some comparison pictures.

Here is the stock pump:





Once you remove the four nuts on the back, you can use a 6mm x 1.0 bolt and a U shaped piece of steel to pull the guts:


In order to 'blueprint' this oil pump you would need to pull the four little studs, a small alignment ring, and then carefully mill the inside face of the body, thereby tightening the clearances between the flat sides of the gears and the body.

Schadek and Melling pumps are much easier to 'blueprint' because you can simply deck the face using something as simple as sandpaper on glass.

The stock pump does match up with the oiling bores in the case much better. Here is a stock pump. If you look closely, you can see the small variance: the case hole is slightly smaller than the pump hole.


Here is the Schadek pump body. Notice the much larger variance.


Finally, here are the numbers.

Body Height Measurement:
Total Height Measurement:

And finally, I'm not making any recommendations or judgements about anything here. This thread is simply about posting facts. (IMG:style_emoticons/default/biggrin.gif)

[Mark Henry]

$330 is a lot of bones for a pump

I'd do the 30mm pump and Gene Berg pressure relief cover as in montreal914's 1st pic. You don't have to remote filter this set-up, you could just plug the cover (and not plug the pump return side) and the pressure relief feature still works.
My 2.6 liter T4 powered bug has a 26mm and a regular steel FF cover.

The reason I don't like aluminum covers is because the pump gears try to drill through them. You can really see this on old T1 covers, but I see this in stock T4 pumps as well.