Z134 oil pump

RonWW · May 22, 2014

Hey guys, I haven't posted here in quite a long time, but do read at least every couple days. But now I have a few questions. I am doing an in frame overhaul in my TO 35. Most urgent at the moment concerns the oil pump cover (flat plate). My buddy took it apart and did not pay close attention. The inside of this cover/plate has a machined area on the inside and we need to know if has to be positioned to a certain side in the pump. If so, how can we determine which way it goes?...........Second question is whether there is a front/ back to the new pistons. I have complete sleeve kits and have installed the new pistons on the re bushed rods. I could not see any marking to designate front...true? Thanks for any input ! Ron

miner09 · May 23, 2014

Piston's will be marked front or have a arrow to front. If not marked it doesn't matter.

Dieseltech · May 23, 2014

If I remember right the plate will only go on one way, and a new plate is flat on the gear side. Over time the gears will wear into the plate. The dealer I worked for years ago would rework worn plates flat when the pump was repaired with all new gears and bushings. Some Continental pumps had countersunk plate screws so the plate can't be flipped over. The replacement pistons were not directional if I remember correctly also on this engine, could go either way. G176 engines, and most others were directional.

Dan S (NY) · May 23, 2014

The piston/sleeve kit I got 12 years ago had a notch in the top of the piston that was to go towards the front. Your kit may be different.

Dan

Steve@Advance · May 23, 2014

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".

RonWW · May 23, 2014

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.

RonWW · May 23, 2014

Thanks Dan, the notch is what I was looking for also. I am accustomed to old Ford motors which always have a notch on the front of the piston. I guess these are ok either way from everyone is saying.

RonWW · May 23, 2014

The screws on this one are countersunk. I can turn it 180, but over. Do you remember anything about this small machined are that I referred to? Thanks, Ron

RonWW · May 23, 2014

They are not marked at all, so I had made the assumption the "it didn't matter" lol. Thanks

Steve@Advance · May 24, 2014

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.

Z134 oil pump

RonWW

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miner09

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Dieseltech

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Dan S (NY)

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Steve@Advance

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RonWW

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RonWW

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RonWW

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RonWW

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Steve@Advance

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