oil pump cover ?, are they flatsurfaced Options

[brant]

hi all.
forgive my ignorance.
the time I had a big oil pump it was a melling with a flat cover that fit over it.. (you know the leaky one)

so this go around I bought a different brand pump that comes with no cover and the instructions indicate that you re-use the flat cover.

well guess what.
I took the blower housing off and this 1975 2.0 does not have a flat cover. the pump is made into the cover and I won't be able to re-use this cover.

what gives.
Is my set up standard for a 75?
do any years have a flat cover?
do I have to get a melling instead? or produce my own cover?

I have a 1.7 yet to tear up and I'm hoping it has a flat cover on its oil pump... but didn't get that far along yet.

anyone care to shed some light?

tia
brant

[dmenche914]

Never ever use the "flat" cover for the type I oil pumps. The "flat" cover might be flat when you measure it, but believe you me, it will not be flat once you torque down the four cover nuts. Torquing them down wil cause the "flat" cover to bow up in the center. I have confirmed this with dial indicator measurements. I forgot the exact value but in was in the order fo several thousandsth of an inch, well within the tolerance busting amount.

If you require a cover for the melling, any other aftermarket or stock Type I pump, be sure to get an OEM VW cover. The OEM VW cover does not bow when installed!!!

The stock Type I cover from VW has raised edges on all four sides, this raised edge prevents bending of the cover when torqued down (as measured by me) the plain "flat" cover with no raised sides (ie ribs) will result in oil pressure loss, the stock VW cover solved this problem. Some grinding away of one of the raised edges was required to fit on my Type IV engine, but the OEM VW cover still remianed dead flat when torqued.

The flat cover which is essentially a plate with four holes for mounting should be shitcanned, it is not good.

trust me on this or go get your dial indicator, set it to measure the center of the cover plate on the engine, and start torquing the cover down, you will notice that once the bolts begin to tighten down, the enter of the cover plate will reverse direction, and start to bow upwards, away from the pump. Repeat the test with the stock VW cover with the raised edges, and you will notice zero bowing of the plate as you torque it down, that's the fact of the matter.

good luck

PS be sure you are using the correct supper thin VW gasket under the cover. It is much thinner than the one used under the pump body. The gasket will determine the gap between the cover and the pump gears, to thick a gasket, and the clearance gets too big.