Little known salt water impeller housing

[WinnerCougar74]

I recently installed what is a called a Heavy Duty Water Pump Kit, F5H074 on my 1974 Chrysler 135hp outboard. The standard kit is a FK1033-1. The Heavy Duty housing is 2 parts instead of one and made out of some kind of alloy that looks like a combination of copper and stainless steel. The impeller is 3/4" tall with 5 splines. The water outlet seal is white plastic instead of rubber. All of these improvements could be seen by a very strong stream (even on muffs) at the tell tail. So far I cam very happy. Water temps on any area of the head was 136-140 degrees. After 6 days straight of running the engine in salt water the over temp alarm never came on even with a lot of trolling. It was worth the $100.

 

[WinnerCougar74]

Some websites list the F5H074 as HEAVY DUTY WATER PUMP RECOMMENDED FOR CONTINUED OPERATION IN SANDY OR SALT WATER.

 

[alldodge]

Thanks for the post
I'm in fresh so guessing I don't need, but heavier duty sounds good. My comment is; you said the impeller is five blade (not 6 like regular). Guessing when the impeller needs replacing, can it be found easy enough

 

[WinnerCougar74]

Sorry about that it is 6 blades. The one that was in it before had 12 vanes like the picture below. The 6 blade might help do a better job of moving debris and water than the 12 blade. I sometime go thru shallow fresh water with plants growing in it. I 'm thinking it might help get thru the plants better. This might be a benefit of the 6 vane.

 

[alldodge]

Ya got me scratching my head some. The one that came out of my 125 and 140 was 6 blades, and the ones I'm finding to replace are also 6 blades

 

[surfsalterpath]

..... could you please post a link where you sourced this "heavy-duty" water pump? THANKS!!!!

 

[WinnerCougar74]

You should be able to search for F5H074 on the internet

 

[dingbat]

What does “heavy duty” buy you?
Is this a Chrysler specific issue?

I run outboards in saltwater 300-400 hours a season. Easily 200 hours of that trolling. Never had cooling issues.

If anything, I run too cold while trolling.

 

[WinnerCougar74]

I think it is a Chrysler outboard issue. The first post explains the difference.