Put a mark  on the pump cover and the body so that you can install the cover in the correct orientation.
Remove these components:
- the (3) screws  and the (3) lock washers  for the pump cover.
- the impeller cover 
- the Philip Head Screw (PHS)  and star washer  note: Turn the PHS  clockwise to loosen it. Discard the star washer .
- the impeller 
- the shims from the impeller shaft 
Install the same number of shims that you removed onto the impeller shaft.
Install the impeller, the flat washer and the impeller screw.
Adjust the number of shims on the impeller shaft until the gap between the impeller  and the pump base  is 0.007" .
Remove the impeller screw and flat washer.
Put red thread locking compound around the edge of the impeller shaft. 
Slide the impeller up and down on the shaft. Make sure that the locking compound is spread evenly on the shaft and the inside of the bore of the impeller.
Put red thread locking compound on the impeller screw .
Install the screw  and the flat washer .
Align the marks on the cover and the pump body.
Install the impeller cover with the (3) screws and (3) lock washers.