Originally Posted by boatman61
Anyone with advice on opening a Jabsco
water pump to get at the seals etc
Everyone's to busy so looks like another DIY job
Presumably a rubber type impeller in a brass/bronze pump chamber! If so here are a couple of hints.
Go carefully while undoing the screws, they are often corroded and break easily. Penetrating fluids (like diesel) are your friends, resort to heat only if necessary.
Remove old impeller with lock pliers (visegrips etc), not screwdrivers or other levers
The shaft seal
nearest the impeller is the most important one and you need to check the surface of the shaft very carefully as it is often worn where the seal is.
Clean the surface of the shaft at this point carefully. I used toothpaste and a soft cloth, it took a while to remove remmants of the old seal. Some use fine emery or Scotch Brite but I would avoid that if possible. Too rough IMHO.
There is a right way and a wrong way to fit the seal. The open part of the seal should face towards the pump chamber (ie the impeller). This seal will usually have a garter spring that helps to keep the seal surface against the shaft. In a water seal, this garter spring will be stainless steel
but in an oil seal
, the spring will be carbon steel
. Your new seal should be a water seal, not a oil seal
but sometimes you end up with an oil
seal which clearly is not so good. If that is all you can get, pop off the carbon steel spring and fit an O ring in its place. I had to do this last week, no water seals were availabe in the whole of Tassie
Best thing to lubricate the new impeller when refitting is glycerine.
Polish the inside of the pump chamber with very very fine emery paper. I like 800 or finer wet and dry, used wet.
Use new screws for assembley if you can get them.
Straighforward job really, you will be an old hand at it soon