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)

[stevegm]

Before I order an oil pump, I just wanted to bounce this off of the collective wisdom of the world. It seems that the consensus is that the Schadek 26mm Oil Pump, Modified for Type 4 Engines, is the best option for a type IV engine. Is this right?

I have a 2056cc engine, and am not planning to run an external oil cooler, or anything.

Here is the link to the pump I am planning to order - http://vwparts.aircooled.net/Schadek-26mm-...khd-26mm-t4.htm

[Mark Henry]

It seems that the consensus is that the Schadek 26mm Oil Pump, Modified for Type 4 Engines, is the best option for a type IV engine. Is this right?

I have a 2056cc engine, and am not planning to run an external oil cooler, or anything.

[/url]

Yes, use the 26mm, the 30mm is too big without a pressure relief cover on smaller engines. The Melling pump for VW is a turd.
For quite a while now I've seen the pumps a bit spotty on the OD tolerances. I O-ring my pumps, but it is a PITA. I have experimented with a light coat of threebond on the rear edge of the case hole only, other side of the in/out case galleys, with no ill effects. If you try this don get any threebond in those galley holes.

[stevegm]

It seems that the consensus is that the Schadek 26mm Oil Pump, Modified for Type 4 Engines, is the best option for a type IV engine. Is this right?

I have a 2056cc engine, and am not planning to run an external oil cooler, or anything.

[/url]

Yes, use the 26mm, the 30mm is too big without a pressure relief cover on smaller engines. The Melling pump for VW is a turd.
For quite a while now I've seen the pumps a bit spotty on the OD tolerances. I O-ring my pumps, but it is a PITA. I have experimented with a light coat of threebond on the rear edge of the case hole only, other side of the in/out case galleys, with no ill effects. If you try this don get any threebond in those galley holes.

So it seems that the 26mm is no longer available. The type IV store has the 30mm, which is a type I pump that has been modified for use on a type iv. My engine is a 2.0 liter with a stock came, and larger pistons (2056cc). What is the issue with the 300mm being too larger? Other suggestions?