makomagnet

I have a 1987 SD raw water cooled 454 with an alpha cooling system. I want to convert it to a belt driven raw water pump with a thru hull pick up. My question is,
Is the Merc pump any better than the Jabsco pump. I tried the Johnson crank pump, but I have a 3 groove pulley and the anti rotation brace will not fit, and was very tight. So I will go with V belt pump
Is there a danger of too much water (pressure/volume) ?
I noticed, I have to take the circulating pump off to install the new water pump mounting bracket, is there another way ?

Also have Groco garden hose attachment for fresh water cleaning and winterizing, any know problems ? Pressure ?

Any input ?
I Need help

makomagnet

What is "take off" ? Is that NEW, USED, REBUILT ?
Also looking for the "V" belt pulley.
Is the Merc pump better than the Jabsco pump ?

Scott

Biggus

Mercruiser has a kit that includes all the items needed to bolt the pump to your motor. I think it even includes the transom mount pick up.

It`s been a while, I think I found it in the Quicksilver catalog.

makomagnet

I have contacted Mercruiser directly, NO KIT exists for a 1987 454 alpha to belt driven raw water set up. The Merc tech did e-mail me a all the part numbers needed, but they're all stand alone, no kit.
So, is Merc raw water pump better than than the Jabsco raw water pump ?

Thru hull (speed pick up) is already in with 1 1/4" sea cock, need sea strainer, a pump, and the pulley.

Scott

makomagnet

Kevin,
I'm very interested in the the NEW Jabsco pump and the V belt pulley.
I would like to discuss pricing and condition.

Scott
978-475-6764

www.makomagnet.com

Ratchet

I use a johnson crank mounted pump for my SBC's & they work great.

Just a question.........why don't you mount the pump and make a longer anti-rotation bracket.....It fairly simple. Also the impellers are reasonable in price, & they are a breeze to change.

I think I bought mine from lighthousemarine.com

Just a thought

sonic28

IM RUNNING TWIN 350 MAGS WITH TWIN ALPHAS. I ALSO RUN GIL EXHAUST. I FOUND THAT I WAS NOT DUMPING ENOUGH WATER SO I ENDED UP ADDING THE RAW WATER KITS(MERC) WHICH WORKED OUT GREAT EXCEPT NOW I WAS DUMPING TO MUCH WATER.THE FIX WAS EASY.THE WATER FROM YOUR DRIVES BLOCK OFF THE PASSAGE IN THRU THE TRANSOM ASSY.AND HAVE THE WATER FROM YOUR DRIVE DUMP BACK IN TO THE WATER.CAUTION WHEN YOU FLUSH YOUR SYSTEM YOU MUST KEEP THE EAR MUFFS ON THE DRIVE AS WELL AS HOSE TO SOME TYPE OF VALVE FOR THE BLOCK.YOU CANNOT JUST STOP THE WATER IN THE DRIVE YOU HAVE TO KEEP THAT LITTLE ALPHA COOL.ILL WORK ON GETTING YOU THE CONVERSION KIT#

mopower

I used Johnson pumps on my 540 cranks to eliminate the Merc pumps that are near impossible to get to on my boat. Reversed the bracket to the starboard side and flipped pump in/out to the starbodrd side to use all existing plumbing.

mopower

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mopower

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