|Water pump needs to be temporarily assembled to establish the amount of adjustment required to the set-screw. The gasket is installed and the faces are tightened up to achieve a genuine reading. The DTI on the right was set to zero with the shaft down; when the shaft was pulled up it gave a reading of 0.006" free play (ie 0.094" on the dial).End float on the shaft should be between 0.005" and 0.008".|
The adjustable end stop. This one is made from an HTS bolt machined to remove the flats; this allows a socket to reach the locking nut underneath.
On the other half of the casting, which is second hand, somebody had machined about 0.030" off the centre boss - presumably to remove some pitting. The upshot was that the impellor vanes were rubbing the casing. A copper-alloy shim was made which gave roughly 0.010" clearance and was then bonded to the casting.
|The sealing cups, etc for the gland assembly.|
|New shaft and impellor; the latter screws onto the former.|
|The only unfortunate matter about this casing is that the studs have been replaced using 6mm threaded rod - the excess lengths will need trimming down. Yet another example of cretinous intervention.|