Quote:
Originally Posted by athomas
Is it due to machining differences and to tolerances that make it not feasible to just replace a couple pistons ?
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Yes. Pistons are mated to the block at the factory. You really aren't supposed to even swap places with them. They need to go back in the same hole. Oh, guys will tell you they have done it and it was fine. But the manufacturers tell you not to, the books tell you not to, they teach you not to when you go to school for them...... so, you get the picture.
Believe me, your better off not using any of the piston parts of that pump. (Pump or motor blocks.) If it was run low on fluid, the damage you see isn't the only damage. Save pump if you have room. Charge pump is probably fine, and so are the shafts, case, and other "hard" parts that do sometimes fail/get damaged. (Such as a "wollered" hole on the in the input shaft.)