Performance 700r4 rebuild
- Thread starter Wumbo
- Start date
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Wumbo
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- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Checked pump clearances.
New rotor .015, new slide less than .015. Surface finish on both sides is ugly. Somebody resurfaced them on a mill with a worn out cutter. I'll be chucking them up in the lathe to get a better surface finish, and get clearances in spec.
Drainback circuit was wonky. .250" from the front bushing pocket, .3125 on the rear of the cover, then .225 through the pump body.
Not performance related, but I drilled the passage through the pump body to .281 and will chamfer the hole so it makes a clean transition after I refinish the pump surface.
New rotor .015, new slide less than .015. Surface finish on both sides is ugly. Somebody resurfaced them on a mill with a worn out cutter. I'll be chucking them up in the lathe to get a better surface finish, and get clearances in spec.
Drainback circuit was wonky. .250" from the front bushing pocket, .3125 on the rear of the cover, then .225 through the pump body.
Not performance related, but I drilled the passage through the pump body to .281 and will chamfer the hole so it makes a clean transition after I refinish the pump surface.
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Wumbo
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- 454
Oddittitties in the pump.
PR valve. No TV or reverse boost. Just the valve, spring, andaluminum plug. Edit- 4L60E boost assembly sleeve.
Flats ground on the TCC valve
PR valve. No TV or reverse boost. Just the valve, spring, and
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Flats ground on the TCC valve
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Wumbo
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Resurfaced pump, pressed out stator support, and checked pump clearance. Pump rotor and slide came in at .0018 after machining the pump.
Waiting for new Sonnax stator support to show up.
Waiting for new Sonnax stator support to show up.
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That sucks, man - sorry to see...i had a similar situation a month ago - found out the stator support was warped. Had to cannibalize another 700R4 core to put that pump back together.
DoubleDingo
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That sucks!
Wumbo
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Anyone know if TCI marks their constant pressure valve bodies in any way?
They use the same pressure regulator setup as what I had in this pump.
They use the same pressure regulator setup as what I had in this pump.
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