How to Rebuild and install a Water Pump

Manatee Mobile Marine 941-722-1980 1

How to install a water pump

Hello and welcome to how to install a water pump. Manatee Mobile Marine is owned by Ray Corda and located in Palmetto Florida. In a moment, you will meet his two mechanics, Colin and Armando. They are going to demonstrate how to install a water pump.

Manatee Mobile Marine 941-722-1980

Meet the mechanics

Hi, I’m Armando. And I am Colin.

Let’s get started.

2


Be Safe!Prior to starting any job on a boat, be sure to bring your boat to a safe working environment.

Manatee Mobile Marine 941-722-1980

Assemble your tools

4


Remove the upper cowling (engine cover)


Removing the lower cowling (engine cover)

Start to remove the lower engine cover by removing the bolts.

Tools: small, long ratchet90 HP and below: tilt/knuckle socket to loosen the bolt in the back.



Removing the lower cowling (engine cover)

After removing all bolts, it is recommended to have two people remove the lower cowling.


Power Trim & Tilt

Disconnect the power trim & tilt wiring.


Power Trim & Tilt

The power trim & tilt is disconnected in the photo.


Remove the lower cowling wire connectors

Remove the shift shaft coupler screw.


Trim the motor up

Remember safety!


Alignment

Make a note of the alignment index mark of the anti-cavitation plate.


Remove the anti-cavitation plate


Remove 2 bolts from bottom

Remove 4 more bolts, 2 from each side and remove gear case


Place the gear case on a stand.

After removing all bolts, slide the gear case off and place it on stand.


Remove water pump housing

Remove 4 screws on each corner of water pump housing


Slide the water pump housing off of the driveshaft.

Remove impeller


Remove impeller key


Slide the impeller plate up and off


Impeller Plate Gasket

Sometimes it may be necessary to scrape the water pump base area to remove gasket.


Inspect the housing

Inspect the housing for cracks or melting.


Apply a thin bead of Adhesive 847 in O-ring groove. Be careful not to apply in air bleed groove. Place O-ring in the

groove.


Place cup in housing.The cup locks in place in the housing with a square index tab.


Apply a bead of adhesive to the groove surrounding the

cup.Install O-ring seal.


Coat the water pump base area

Lightly coat the water pump base with a gasket sealing compound.


Install the gasket. Apply compound to the top of the gasket.



Add grease and place impeller key.

Align impeller key with impeller slot.


Slip the new impeller over the drive shaft and key.


Water Pump

Assemble your water pump housing according to your particular pump’s instructions.


Slide the newly assembled housing

on driveshaft.

Rotate driveshaft clockwise.


Coat the screws with grease before

installing.

Position the coated screws in place.


Tighten the screws


Torque screws 60 – 84 inch lbs.


Apply triple guard grease to driveshaft.


Apply triple guard grease to mounting bolts.


We are now ready to reinstall the lower unit.


Align drive and shift shaft


Align water pump with water tube.


Secure gear case and stabilize by putting one bolt in place.


Start all four bolts.

Tighten 7/16 screws 28-30 ft. lbs.

Tighten 3/8 screws 18-20 ft.

lbs.


Attach the two additional

mounting bolts. Reattach trim tab.


Connect the Shift Shaft using pliers to ensure it is straight.


Tighten the screw to the shift rod.


Lower Trim Tilt.

Reinstall wire grommet.


Reconnect Trim & Tilt Switch.

Two people: Reinstall lower cowling.


Place muffs and turn on water


Start the engine.

Make sure water is coming out of the tell tale. If not,

turn off engine immediately!


You are finished!

To complete the job, replace the cowling.

Self Improvement

How to Rebuild and install a Water Pump