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Re: Z134 oil pump

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Author  [Modern View]

05-23-2014 08:22:10

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If the pistons are not marked with an arrow on top, they will go either way. The rods do matter. The rod correlation numbers go toward the cam shaft, the oil spray hole (lower end of rod) goes away from the cam side.

The pump plate, you should see wear marks from the gears. If the plate is symmetrical and machined on both sides, it can be reversed to get a new surface for the gears to run on. The gasket behind the plate is the critical component. It serves as a shim to set the gear clearance. Should be .007" end play. Also the mount gasket sets the drive gear to crank gear backlash. Should be .005 to.010".

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05-23-2014 20:51:16

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 Re: Z134 oil pump in reply to Steve@Advance, 05-23-2014 08:22:10  
Thanks Steve. The plate does have heavy marks inside from the gears. I am hoping these do not affect pressure. The machined area that I mentioned is about a half inch by half inch, and only to the inside. It is also offset from the center a bit. I can rotate the 180* and it puts the mach area to the other side of the pump internals. If I flip it over, there would be no machine mark (not sure the beveled screw holes would let me do that anyway.).....Thanks also for verification of the rod direction. I had it right.

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05-24-2014 15:42:42

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 Re: Z134 oil pump in reply to RonWW, 05-23-2014 20:51:16  
I wouldn't try turning the plate over. If the grooves are deep they will affect oil pressure. So will the condition of the rest of the pump...

If you feel good about the pump, you could lap the plate with 180 grit wet sand paper on a known flat surface, like a machined surface or a piece of glass.

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