Oil pump assembly question

[Lyndon302]

Early pump. I've pulled it apart and cleaned it.
I'm happy with it.
Was working fine in the car
Assembly. Any tricks ?? Or just assembly lube on the gears to get it sucking.
While I'm at any tricks in priming the engine with oil upon assembly.
Thanks lyndon

[Lyndon302]

With some thought.
The pump will fill with oil after filling the oil tank re by pass ??
Lyndon

[MichaelSJackson]

Lyndon,

Since you have the case split, have you considered upgrading? Porsche made several changes to the design over the years. They changed the ratio between the two halves and improved the pickup.

Michael J

[stownsen914]

Originally Posted by Lyndon302

With some thought.
The pump will fill with oil after filling the oil tank re by pass ??
Lyndon

It will fill by gravity from the tank, but do it a favor and coat all the internal surfaces and the shaft so there's no chance any part is dry on first startup.

[Drbraunsr]

Turn the engine over with no fuel/spark - build up pressure using the starter. You'll see pressure on the gauge. Leaving the plugs out will help.

['78 SC]

There may be differences in the wear patterns of the various teeth. Did you mark the rotor teeth so you can reassemble it with the same teeth meshing as before? If not, check the force needed to rotate the pump when the nuts are fully torqued. If the force is excessive, open the pump, change the mesh and try again. I went through this recently with a 930 pump and found the pump rotated much more freely with the right teeth meshed.

I squirted some assembly lube on each set of teeth.

Per Drbraunsr, make sure you have good pressure before letting the engine start. I pull the fuel relay and spin the motor until the pressure gauge registers.

[Lyndon302]

Originally Posted by '78 SC

There may be differences in the wear patterns of the various teeth. Did you mark the rotor teeth so you can reassemble it with the same teeth meshing as before? If not, check the force needed to rotate the pump when the nuts are fully torqued. If the force is excessive, open the pump, change the mesh and try again. I went through this recently with a 930 pump and found the pump rotated much more freely with the right teeth meshed.

I squirted some assembly lube on each set of teeth.

Per Drbraunsr, make sure you have good pressure before letting the engine start. I pull the fuel relay and spin the motor until the pressure gauge registers.

Teeth all marked