The raw water pump is driven by a belt on the engine and includes an impeller that drives the pump. Ive seen old outboards that got so hot the paint burned.
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Move this wire around from the opening by taping it to another part or wedging it between components.
. However just like any motor parts and components will require replacing on a regular basis. Remove the four bolts that hold the water pump assembly in place Note. Carefully align the water pump tubes and slide together.
For the most part they need to stay between 40 and 90 degrees at all times. As a general rule of thumb the water pump impeller should be replaced every other season. If that works all is good.
The model-specific maintenance. The water pump pushes water up through the engine to keep it cool. If the impeller is dry and not a run dry impeller the vanes get hot.
If forward or reverse are engaged the prop shaft turns. Lay out and identify all parts on a clean. Go to the engine block and find the water pressure tap.
The impeller is not an indestructible part. Even when the outside air is cooler than the water it still works efficiently to heat up the water using the surrounding air. You can see the imprint of the impeller on the back.
Its recommended that you inspect your marine water pump impeller once a year or every 100 operating hours whichever comes first. Outboard water pumps are simple designs. And once again you may need a flashlight to see what goes where.
Notice that the gearcase is also being drained of old lubricant while the author completes the water pump job. The pump draws water through the intakes and up into the housing. As the driveshaft rotates it turns an impeller inside the water pump housing.
Remove the water pump housing. However they do only work in some areas. When the impeller fails the pump cannot pump and the.
There may be a fifth bolt located above the propeller depending on your outboard model. The main tips are having the outboard deep enough in the water and mak. Look for some cast-in grating or perhaps a screwed-in plastic screen.
For steps requiring lubrication use BRP Triple-Guard Marine Grease or. How to Replace an Outboard Water Pump. The fan blows cold water into the marine engine to keep it cool while the engine is running.
This Mercury outboard water pump was run dry briefly and the impeller literally melted within the housing. Take off the tap plug using the Allen wrench. The raw water pump is well above the prop shaft at the top of the gear housing and turns whenever the drive shaft turns.
Shine a flashlight inside the motor making sure the old one isnt lodged inside the recess if the crankshaft internal spines. The water pump assembly is attached to the drive shaft and uses the rotation of the driveshaft to power the water pump. In this video I quickly go through how to testing the water pump in an outboard motor.
A water pump repair kit is available for almost all outboard models. Reattach the shift linkage. If clearing the nozzle doesnt improve the flow that indicates either restricted cooling system flow or a weak water pump.
The impeller blades vanes touch the liner at lower speeds as the driveshaft turns but as the engine revs up the impeller blades bend back away from the housing liner. The water intake for your engines cooling system is located forward of the propeller on the lower unit housing. Next remove the rubber water tube seal from the top of the water pump assembly.
Liberally grease the drive shaft splines. A water pump is a pretty simple item. Big Jon Honda 5hp Outboard Shop Outboards.
Run the other end of the water pressure gauge tube to the gauge. Screw it into place and then tighten the nut. Take the spark plug wire boot off the plug tip.
Outboard motors are more reliable than ever before. Water pump is ready to be removed using a fitting socket on the four mounting bolts. Keeping this in consideration how does an outboard motor water pump.
Fishing Boat Seats. When the impeller is broken it shuts off the water supply to the engine and causes it to overheat. Put the water pressure gauge tubing into the tap and use the wrench to tighten the nut.
It pulls heat from the surrounding air and puts it into the water. When the impeller fails the pump cant pump and the engine will overheat. The part of the pump that does the work and pulls the water through the system is called the impeller.
Remove the snaps on the outboard motor upper case and take off the cowl cover. Turn off the main electrical cutoff switch. It is a rubber paddlewheel-looking thing.
In this case the entire water pump was replaced. With your socket wrench remove the plug. They are nearly always engine driven meaning that if the engine is spinning so is the pump.
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