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Originally Posted by TomZ
(Post 4822894)
I understand what you’re saying, but if you use the bushings that I provided, the bolt circle aligns properly. The spacer plate was only used to keep the pump body away from the pulley. Even with the long-shaft pump, the pump body ends up close enough to make hose fitment a challenge. The way I have it set up works really well and the slight wiggle I have witnessed is probably due to pump shaft tolerance more than anything. The way the angle bracket is bushed/dampened indicates that some movement is expected.
i dont remember any bushing... i just holes bigger than bolts and how is this going to keep pump center??? so i had my machine shop cut a depression in pulley to center.. |
Cast GM pulleys used on Volvo and OMC engines have 1/2” alignment dowels to center the pump. The Merc stamped serpentine pulley doesn’t so I had to improvise.
In the pictures above (post #32), I showed parts for the bushings that I bought. The outer diameter was 1/2” and the inner was 3/8”. I cut the bushings down to the depth of the pump flange allowing 3/8 bolts to be run through the now narrower mounting points centering the pump. It was pretty simple and only a few bucks to make work. I didn’t have enough depth so I used the 3/8 spacer plate so I could work with my hoses. |
https://cimg4.ibsrv.net/gimg/www.off...dd1410ba88.jpg
This is the volvo penta set up i am going to swap to on my 350 scorpion ,delete that p.o.s bronze factory pump. The support bracket attaches to the inlet hose with a clamp ,the similar set up used by indmar uses a johnson pump with no clamp .there is a aluminum button that centers the belt pulley that is not found in mercs version |
That’s an interesting setup. Looks like a replacement that would keep belts correct and everything.
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Originally Posted by airjunky
(Post 4823221)
This is the volvo penta set up i am going to swap to on my 350 scorpion ,delete that p.o.s bronze factory pump. The support bracket attaches to the inlet hose with a clamp ,the similar set up used by indmar uses a johnson pump with no clamp .there is a aluminum button that centers the belt pulley that is not found in mercs version
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Originally Posted by airjunky
(Post 4823221)
This is the volvo penta set up i am going to swap to on my 350 scorpion ,delete that p.o.s bronze factory pump. The support bracket attaches to the inlet hose with a clamp ,the similar set up used by indmar uses a johnson pump with no clamp .there is a aluminum button that centers the belt pulley that is not found in mercs version
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Originally Posted by flashgordon
(Post 4822083)
i added closed coolant system several years ago...
added same pump... works fine... https://cimg6.ibsrv.net/gimg/www.off...bbe9a0c64d.jpg https://cimg5.ibsrv.net/gimg/www.off...bc0b0ea2be.jpg i found a range in prices...shop around got mine for 150 each but was 3-4 years ago..i also made made my brackets...for what they want for one ,,,i made two for half the cost..just some angle iron and welder...done Looks good. Do your brackets take all the movement/shock out. I was just looking at where you converted back to AN and looks like a place to potentially crack. I’m just thinking out loud and getting plumbing ideas for my own. |
2 of the weiand blower pulley spacers take it out to about the same distance , the volvo pulley is about 3/4"larger diameter. If you have the room ,you can pull the 4 5/16 pump housing bolts for impeller swap with hoses on ,can be a pita getting new impeller in there though .just depends on what's in the way on the sides
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Jabsco Industries makes a decent crank driven pump.
https://th.bing.com/th/id/R.44b368b9...pid=ImgRaw&r=0 https://d1mv2b9v99cq0i.cloudfront.ne...I0YjhhY2EifQ== |
I’m using the 6-series version of this pump.
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