Danny Jo
New member
Last year I said that there appeared to be no difference between a standard oil seal and a Johnson raw water pump shaft lip seal (see this thread)
I am sorry to report that I have been proved wrong.
Before launching last week, I replaced my impeller and filled the raw water circuit by pouring water in at the raw water strainer and allowing it to run back to the intake seacock, which I then shut off. The pump leaked.
When I disassembled it, I found that the spring in the lip seal had rusted through in several places. Closer comparison of the lip seals supplied as replacement Johnson parts by Aquafax with another of the generic oil seals from the local supplier of bearings and seals showed that the Johnson seal had a bronze-coloured spring, while the oil seal had a steel-coloured spring.
If anyone acted on the basis of the information in my post, my apologies, but take a good look at your pump seal.
Happy sailing!
I am sorry to report that I have been proved wrong.
Before launching last week, I replaced my impeller and filled the raw water circuit by pouring water in at the raw water strainer and allowing it to run back to the intake seacock, which I then shut off. The pump leaked.
When I disassembled it, I found that the spring in the lip seal had rusted through in several places. Closer comparison of the lip seals supplied as replacement Johnson parts by Aquafax with another of the generic oil seals from the local supplier of bearings and seals showed that the Johnson seal had a bronze-coloured spring, while the oil seal had a steel-coloured spring.
If anyone acted on the basis of the information in my post, my apologies, but take a good look at your pump seal.
Happy sailing!