Johnson Crank Pump Plate Bolts

[jeffnick]

I'm wanting to get a spare set of the little bolts that secure the cover on my raw water pump for my 260A. Are these little bolts metric?

 

[Don S]

Re: Johnson Crank Pump Plate Bolts

You have an aftermarket replacement pump. Volvo used Jabsco pumps then.
Best thing to do is remove one of the screws and see what size nut fits.

 

[jeffnick]

Re: Johnson Crank Pump Plate Bolts

They're metric - 5 x .8 x 10.

 

[Don S]

Re: Johnson Crank Pump Plate Bolts

Interesting, I know some of there older pumps had SAE screws in them, just didn't remember what size. Now they have gone metric.

 

[billbayliner]

Re: Johnson Crank Pump Plate Bolts

The Jabsco has six cover screws and the Johnson uses only four. I was also thinking that both are metric and are bronze screws.
There's a good chance that this pump has been changed over the years.
Both Jabsco and Johnson small pumps use the same impeller, but when you get into the larger Jabsco and Johnson pumps, the impellers look the same but are not. The shorter impeller fits into both but will cause problems in the wrong pump.
Just an FYI for ya!

 

[jeffnick]

Re: Johnson Crank Pump Plate Bolts

That explains why there were 5 different gaskets w/ the new impeller...some w/ 6 holes.