Since I had never replaced my own impeller before, I did this little writeup for the Tech section for people like me.
SuperJet Impeller Removal and Replacement
So you've decided to replace that old impeller. I for one am proud of you and your willingness to do it yourself. Let's get started.
First of all, you will be needing an impeller. I recommend Impros for all your impeller needs. In this series of instructions, I'll be installing a Solas Concord.
Get your tools together. Here's a good start on tools you'll be needing just for the impeller:
The impeller tool
A 26mm box wrench for the impeller tool
Driveshaft spline holder
A bench vise
A small blowtorch
Start by unscrewing the four bolts that hold the rideplate on. You may run into old silicone sealant around the rideplate. Scrape this old stuff off. The pump unit is now exposed under the ski and in order to remove it next, the four 14mm bolts need to be removed. Look for shims bewtween the pump mounts and the underside of the ski noting location and amount of shims. Remove the hoses for your cooling line(s) and siphon bilge. Disconnect your steering cable. The pump may be siliconed to the ski requiring a little downward force to free the pump.
The pump assembly and driveshaft should slide straight out the back of the ski. Set the assembly down and take a drink.
Next, we will disassemble the pump. At the reduction nozzle are four 10mm bolts that span the entire length of the pump holding it together. Remove these bolts. On the upper bolts, you may need to keep the washer near the nozzle as you pull the bolt out as it doesn't want to clear the upper mount if you keep it with the bolt head.
The reduction nozle simply pulls off revealing the impeller. Remove the impeller cap, it just slides forward. If you have any trouble sliding it up the lengh of the shaft, just apply some oil or CRC656 to the shaft and it will easily side off.
Slide the impeller wrench onto the shaft along with the 26mm wrench. Place the driveshaft splines into the driveshaft holder which should be firmly held in place in your bench vise.
****I left the impeller in the impeller housing (wear ring) to loosen/remove my impeller. You may choose to remove your housing first. If you cannot loosen the old impeller, pry the impeller housing away from the other half of the pump and apply your torch to the body of the old impeller to assist in loosening it. This should do the trick.****
IMPORTANT Yamaha uses left-hand threads. Turn the impeller clockwise to remove the old impeller, and counter-clockwise for re-installation. Righty Loosey, Leftie Tighty in this situation.
Slide the old impeller out and down the shaft. Take this opportunity to examine your wear ring and pump vanes. Clean as needed with a penetrating oil and finish with a nice coating of oil. Regrease the area and lets put the new impeller on.
Impros says to use an antiseize compound, the SuperJet service manual says to use a thread sealant on the driveshaft threads. Pick your poison. If you plan on removing the impeller soon, I might go with the antiseize. Slide the new impeller down the shaft and screw it down counter-clockwise until it's tight then torque it to about forty-five foot-pounds. Choose which impeller cone you like best and install it.
coat the inside of the wear ring with oil and give the impeller a few spins to feel its clearance.
Reassemble pump assembly with the new impeller and grease the driveshaft. Take this opportunity to decide whether or not you wish to replace your current hoses and clamps connected to the pump.
I found it easier to leave the hoses clamped to the ski and slide the pump into them. After you get your driveshaft in place and your pump ready to bolt up, remember your shims and where they go. Bolt the pump into position, tighten your hose clamps, reinstall the ride plate, and your done. Congratulations on your impeller change.
:cheer: :cheer:
SuperJet Impeller Removal and Replacement
So you've decided to replace that old impeller. I for one am proud of you and your willingness to do it yourself. Let's get started.
First of all, you will be needing an impeller. I recommend Impros for all your impeller needs. In this series of instructions, I'll be installing a Solas Concord.
Get your tools together. Here's a good start on tools you'll be needing just for the impeller:
The impeller tool
A 26mm box wrench for the impeller tool
Driveshaft spline holder
A bench vise
A small blowtorch
Start by unscrewing the four bolts that hold the rideplate on. You may run into old silicone sealant around the rideplate. Scrape this old stuff off. The pump unit is now exposed under the ski and in order to remove it next, the four 14mm bolts need to be removed. Look for shims bewtween the pump mounts and the underside of the ski noting location and amount of shims. Remove the hoses for your cooling line(s) and siphon bilge. Disconnect your steering cable. The pump may be siliconed to the ski requiring a little downward force to free the pump.
The pump assembly and driveshaft should slide straight out the back of the ski. Set the assembly down and take a drink.
Next, we will disassemble the pump. At the reduction nozzle are four 10mm bolts that span the entire length of the pump holding it together. Remove these bolts. On the upper bolts, you may need to keep the washer near the nozzle as you pull the bolt out as it doesn't want to clear the upper mount if you keep it with the bolt head.
The reduction nozle simply pulls off revealing the impeller. Remove the impeller cap, it just slides forward. If you have any trouble sliding it up the lengh of the shaft, just apply some oil or CRC656 to the shaft and it will easily side off.
Slide the impeller wrench onto the shaft along with the 26mm wrench. Place the driveshaft splines into the driveshaft holder which should be firmly held in place in your bench vise.
****I left the impeller in the impeller housing (wear ring) to loosen/remove my impeller. You may choose to remove your housing first. If you cannot loosen the old impeller, pry the impeller housing away from the other half of the pump and apply your torch to the body of the old impeller to assist in loosening it. This should do the trick.****
IMPORTANT Yamaha uses left-hand threads. Turn the impeller clockwise to remove the old impeller, and counter-clockwise for re-installation. Righty Loosey, Leftie Tighty in this situation.
Slide the old impeller out and down the shaft. Take this opportunity to examine your wear ring and pump vanes. Clean as needed with a penetrating oil and finish with a nice coating of oil. Regrease the area and lets put the new impeller on.
Impros says to use an antiseize compound, the SuperJet service manual says to use a thread sealant on the driveshaft threads. Pick your poison. If you plan on removing the impeller soon, I might go with the antiseize. Slide the new impeller down the shaft and screw it down counter-clockwise until it's tight then torque it to about forty-five foot-pounds. Choose which impeller cone you like best and install it.
coat the inside of the wear ring with oil and give the impeller a few spins to feel its clearance.
Reassemble pump assembly with the new impeller and grease the driveshaft. Take this opportunity to decide whether or not you wish to replace your current hoses and clamps connected to the pump.
I found it easier to leave the hoses clamped to the ski and slide the pump into them. After you get your driveshaft in place and your pump ready to bolt up, remember your shims and where they go. Bolt the pump into position, tighten your hose clamps, reinstall the ride plate, and your done. Congratulations on your impeller change.
:cheer: :cheer:
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