How many shims are acceptable to run in the rear tabs of your pump. I'm having some mystery vertical alignment issues as the shaft comes thru the hole in the pump cavity . Do OEM hulls vary much from hull to hull ? looks like I'll need about 1mm of shims on my build hull and used zero on my existing RN . Seems odd but it can only go in one way . FYI I'm using the factory dowels to index the pump.
Super Jet Pump shimming
- Thread starter sportfish258
- Start date
- Location
- South Florida
I think this is the tweeker hull. You installed the bulkhead right? Could be it isn't lined up perfectly. Should have mocked it all up with the pump installed to make sure. One step forward, three steps back.
- Location
- South Florida
If you can make it work with shims go for it but it may affect how the motor is aligned and you will have to do a lot of adjusting to get it right too.
- Location
- South Florida
Did you install the pump shoe too? All of it has to be mocked up together before you lock any part down for permanent placement. Pump, shoe, bulkhead, midshaft, motor, driveshaft tunnel, (and motor mounts if it is a start from scratch aftermarket hull.)
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Dog, Nothing has been installed . Shims would be .128 or 3.27 mm to center the shaft vertically (up and Down ) inside the drive shaft tunnel . It should not matter if I have the shoe in or not since the pump is indexed by factory . The dowels that align the pump is all that is OEM . You can't move it For or aft . I see your point with a kit like the stunt hull . Just don't understand why the OE mounting points are out this much. HUMMMM
- Location
- South Florida
What about the bulkhead? It may not be in oem location anymore.
The shoe could be at an angle and force the angle of the pump to change enough to affect how the driveshaft sits in the tube too. Not impossible.
The shoe could be at an angle and force the angle of the pump to change enough to affect how the driveshaft sits in the tube too. Not impossible.
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Schmidty721
someone turf my rails
- Location
- WI
I had to shim the rear tabs on my pump more than I wanted to when I put it in the 07 RN hull I'm riding now.
The pump was out of a 90 SN. Fit perfectly in my BOB hull with the recommended .5mm shims, but I had to stack several shims when it went in the SJ hull
The pump was out of a 90 SN. Fit perfectly in my BOB hull with the recommended .5mm shims, but I had to stack several shims when it went in the SJ hull
227
Its all about the surf!
- Location
- Oceanside, CA
When Kevin Rickon was assembling his hull (650SN bottom on a new top deck), he called me and asked for alignment solutions for the bulkhead. We put our heads together and decided the BEST option would be to install the pump/drive shaft combo in the hull bottom first and then align the bulkhead to the installed pump/drive line. That idea worked great, and his midshaft fits perfectly.
Never had a hull that took more than a few thou . John, thats what I plan on doing . I fact it's the only solution ..... Thanks for the reassurance . Just odd the hull I pulled the pump from only took one shim and this one takes a freekin stack.
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X2
I am confused? 1mm is a one regular shim and the average normal amount in the rear of a ski.
Your first post says 1mm!
3mm is alot for an oem hull. This is an unmolested oem hull? not a rebonded deal? Is your driveshaft true? or wear ring/reduction nozzle flanges modded/ground down?
- Location
- South Florida
It is a rebonded deal fo sho. Maybe it is tweaked? Lol