I got the water pump housing back from a local machinist with the modification to accept the more modern water pump seals found on the 365GTB/4s. The base of the seal is a little wider than the original seal so I needed it machined wider. This is one of those basic machining operations I would love to learn with more confidence so I could do them at my shop. I’ve been slowly teaching myself how to use my Bridgeport Vertical Mill, but wish I had someone local to me that can give me the confidence to do this simple procedure correctly. These days, it seems you can learn anything on YouTube, but I believe there is nothing better than hands on teaching. There just doesn’t seem to be those kind of teachers nearby!

The water pump housing was cut to accept the wider ceramic face of the new water pump seal.

There was one more step I needed to do which was to cut down the new sleeve to accept the new seal that came with the water pump upgrade kit.

The new sleeve needs to be cut down to the length of the original shaft once the old backing plate to the impeller is removed. This procedure was done on my lathe. At least my lathe skills are good enough for this job!