Instruction for Sea water Pump HP 500

NJDave · 08-03-2008, 01:58 PM

Hey guys I would like to change my sea water pumps on my engines my self for the 1st time. The engines are 1999 HP 500 carbs. The pumps are the water pump fuel pump combo on the front of the motors. I was told due to the age that I should get the kit from mercruiser the is the impeller with the black plastic housing & metal wear plate. It looks
Fairly simple so I started by removing the 2 water hoses & then removing the 4 bolts
From the back housing. Before I break some thing I thought I would ask here. The black
Housing does not want to just pull off & I don’t want to crack it. How does this come apart & am I missing something? Thanks guys.

Westcoast · 08-03-2008, 02:01 PM

Check for a 5th bolt

niceguy · 08-03-2008, 03:48 PM

And the fifth bolt has a nut you have to put a back up wrench on as well.

NJDave · 08-03-2008, 05:08 PM

Quote:

Originally Posted by Westcoast

Check for a 5th bolt

I am such an Idiot. I found the 5th bolt & man this is too easy. Who would pay a shop to change this pump? Mercruiser made this an easy for once. I am going to change the hole kit. For $65.00 you get the new housing an wear plate & new bolts. Thanks guys.