When you buy a replacement impeller for the spares kit, it will probably have a new gasket for the pump end plate in the package. If you lose this, damage it, or are simply using a second-hand …
The creeping impeller blues
It’s tempting to ignore an engine cooling impeller on the admirable principle of, ‘If it ain’t bust, don’t fix it.’ Most rules can be proved by examining the exceptions, however, and this is one of …