PDA

View Full Version : Fittings on Johnson Crank Mounted Pump



realbold
09-14-2010, 06:56 PM
Well I decided to go with the Johnson raw water pump and there are no barbs for the 1 1/4" hose. The inside is threaded for 3/4" pipe and I cannot find a 3/4" pipe fitting with a 1 1/4" barbed end on it.
I'm not even sure if a 3/4" will allow enough water to flow.
George, MOP, Fix, or anyone else with this what did you use here?

MOP
09-14-2010, 07:16 PM
The snouts should fit a 1-1/4", mine fit fine no issues. Leave the black plastic pieces in it they have a bit of a barb and hold the hoses well. Phil

MOP
09-14-2010, 07:19 PM
Mine looks like the one pictured in the link below. Phil http://www.marinepartssource.com/newdetails.asp?pnumber=JP10242321&mfg=Johnson%20Pump&mcat1=1&mcat2=0&mcat3=0&category=&mfgcategory=Flexible%20Impeller%20Bronze%20Water%2 0Pumps&mfgno=10-24232-1

gcarter
09-14-2010, 09:06 PM
You can do this too, but I would have clamped
the 1 1/4" to the pump spigots if I had done it over.
It didn't suffer from too little water though.

http://www.donzi.net/forums/attachment.php?attachmentid=34764&d=1205500979

realbold
09-14-2010, 10:01 PM
So no issues with the 3/4" pipe and no problem with the hose coming off the outlet with no barbs. Thanks. Cant say enough about all the knowledge and help here. :yes:
George where did you get the pump bracket? It looks alot beefier than mine.

gcarter
09-15-2010, 10:26 AM
So no issues with the 3/4" pipe and no problem with the hose coming off the outlet with no barbs. Thanks. Cant say enough about all the knowledge and help here. :yes:
George where did you get the pump bracket? It looks alot beefier than mine.

I bought it from these guys. It's a seperate listing than the pump.

http://www.marineexhaustmanifolds.com/raw-water-pumps.htm

realbold
09-15-2010, 01:46 PM
Thanks again.
BTW after Phil and other's concerns about too much water pressure for a small block I did some research and got the smaller model F5-B9 pump.
The F6-B9 pump is for BBs and fresh water cooled SBs. Mine is a raw water cooled SBC.

mphatc
09-15-2010, 07:51 PM
The biggest problem with these pumps is the cover, and high RPM, I blew out the seal several times before I had a CNC 1/4" thick brass cover made with an o-ring seal . . I also had to machine up a pilot ring to center the pump to my Ford harmonic balancer.

If anyone needs these covers, post me directly . . I can get more made.
You'll get 4 SS allen head screws , 2 orings and one cover.
The Allen heads are much easier to install down in a bilge.

I also did not know I had a leaking cover, I only noticed the bilge pump running after a couple long fast runs . . .

Mario L.