Rebuilding TD water pumps:
The main problems with pulley wobble comes from two sources.
1) Incorrect assembly. A lot of care must be exercised when assembling the pump
when using the felt oil seal under the pulley. The felt seal should be
installed ON THE PULLEY BEFORE it is attached to the shaft. If the seal is
placed on the shaft and inside the housing before the pulley is added, portions
of the seal get caught between the pulley boss and the dished washer (retaining
cover). This keeps keeps the pulley from abuting the washer cover. AS the pump
runs, the felt gets chewed up into fragments which work out and the pulley is
now loose on the shaft.
This same problem with the felt seal getting in the way occurs with the output
flange on the transmission tailpiece which also calls for a special method of
assembly.
2) Incorrect assembly of the castilated nut. The original split pin hole was
probably drilled AFTER assembly to insure that the hole would align after the
nut was tightened. Consequently it would always "line up." Some times the nut
when tight doesn't line up correctly with the hole in the shaft because of
bearing replacement. If it doesn't the nut should be removed, and the bottom of
the nut honed on 360 carbide paper on a flat surface until you get the
castilations to match the split pin hole when the nut is properly tightened.
Another option may be to replace the castilated nut with a self locking nut, but
I've never tried that.
Blake
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