How to Replace an Impeller on a MerCruiser Alpha One
Jun 11, · Mercruiser Impeller replacement on a Alpha one Generation 1. Full impeller and housing replacement. How to replace your alpha one lower end impeller water pu. Apply gasket compound to the small-hole gasket found in the Mercruiser Alpha One Generation One water-pump replacement kit. Slide the small-hole gasket, the pump faceplate and the large-hole gasket, in that order, down the driveshaft and into place atop the drive unit.
Question 1: My Marine Engine is overheating. What can I check to try and isolate the problem? Response: Marine engine overheating can result from a number of different causes. This article will break down the most common problems and associated fixes. MerCruiser Diagrams: See various part diagrams for Alpha Sterndrive models with water pump impeller located in the how to change water impeller alpha one unit as well as the Bravo Sterndive wter where the Sea Water Pump Impeller is mounted within the engine mounted Sea Water pump.
View Diagram s. Step 1: Verify that the temperature gauge is reading changw. Bad gauges are one of the most common impsller of problems. In our opinion no boater should be without an IR-Thermometer on board the boat at all times. You can shoot the temperature of the thermostat housing which should tell you whether the tk that the gauge on the dash is reading is accurate or not. Step 2: Remove the thermostat housing and verify that nothing is stuck in the thermostat and preventing it from opening properly.
Although thermostats can fail this is normally NOT the cause of most overheat related problems. Impellers should be replaced every other year. If you are replacing the impeller due to overheat issues versus routine maintenance, go ahead and replace the pump body as well. Step 4: Verify there are no restrictions to the water flow going to the engine.
Common causes of restriction are grass, weeds, and the remains from previous water pump impellers that come apart resulting from overheating. If your engine is equipped with an oil, power steering, fuel or engine cooler these will most likely be the areas for debris to become trapped. You should remove the hoses from the thermostat housing to the supply pump outlet as well as the pump inlet hose and backflush all the way out of the sterndrive to ensure there are not how to setup database mail in sql server 2008 r2 restrictions.
Step 5: Make sure that there are no leaks on the inlet side of the water what is a canker sore on lip that would allow the pump to draw air and therefore cavitate.
This could be from loose hose clamps, bad sealing, etc. On Mercruiser Alpha models this could be an imporperly sealed pump housing in the sterndrive that draws air once the boat is up and running on plane. On Bravo models this could be a non-sealing pump housing or loose connections on how to change water impeller alpha one inelt water hose. Link to Impellers and Impeller pumps store category.
Link to Impeller Kits Chart. Tags: impelleroverheatwater pump. View Diagram s Step 1: Verify that the temperature gauge is reading accurately. Buy the products and parts you need Buy Parts and Products.
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MerCruiser Diagrams: See various part diagrams for Alpha Sterndrive models with water pump impeller located in the lower unit as well as the Bravo Sterndive models where the Sea Water Pump Impeller is mounted within the engine mounted Sea Water pump. View Diagrams. Step #1: Verify that the temperature gauge is reading accurately. Bad gauges. Jul 27, · Your out drive splits into and you don't have to pull the full outdrive to change the impeller. The marine mechanics are trying to take you and don't let that happen. First on each side of the lower unit on the out drive there is two nuts on each side 5/8th 4 . Oct 23, · I need guidance on replacing the water pump impeller on a Mercruiser Alpha One Gen II. Background: I have a Sea Ray with a Mercruiser with Alpha One Gen II drive. Two years ago the l read more.
The MerCruiser outdrive, or sterndrive, motor has been used on marine watercraft for decades. Like all marine engines, the MerCruiser relies heavily on its water pump impeller to send outside water through the engine manifold, jackets and passage to keep it cool.
The rubber impeller inside the pump housing suffers continuous use while the engine runs, and can fail from age, wear or overheating. Replacing the water pump impeller on the outdrive requires removal of the lower unit case.
Place the engine in a half-tilt position. Remove the ignition key and disconnect the negative battery cable with a socket. Use a socket to remove the lower case oil plug and drain the gear case oil into a pan. Replace the plug and tighten it. Place the shifter in forward gear. Unscrew the anode underneath the lower unit, with an Allen wrench. Mark the trim tab position with chalk. Use an Allen wrench to unscrew the trim tab, but only loosen the screw to pull the trim tab free.
Unscrew the lower unit mounting nuts and bolts, located under the cavitation plate and through the side case, using a socket and wrench.
One of the bottom screws has an Allen head, so use an Allen wrench to remove it. Gently pry the seam between the the upper and lower case with a thin-blade screwdriver, being careful not to damage the mating surface.
Have an assistant help you lift the lower unit and place it in a marine engine stand. If the copper water tube came free of its grommet hole in the upper case, remove it from the lower case housing and stick back up into the upper case grommet seal.
Look for an O-ring on the driveshaft that sits in a groove. Slide the seal up over the shaft and keep it close by. Pull up the rubber slinger seal from the shaft and set it aside. Use a socket to remove the nuts on the plastic water pump housing. Pry the housing loose, and lift it up off the driveshaft. Turn the housing upside down. Note the orientation of the impeller blades; you will install the new impeller with the blades facing the same direction.
Pull the impeller out of the housing bore. Remove the impeller drive key, a gasket, the pump face plate and the last gasket. Clean the inside of the the pump housing with a gasket scraper, engine cleaner and a rag.
Place a new kit gasket down into the pump housing, then the face plate. Place another kit gasket down over the face plate. Set the impeller drive key in the new impeller and position it into the plastic water pump housing. Remember the correct orientation of the impeller blades. Slide the pump housing down over the shaft and onto the studs. Replace the stud nuts and tighten them with a socket. Place a new slinger seal over the shaft and flush it with the top of the water pump housing.
Place a new upper O-ring on the drive shaft groove. Move the lower unit under the upper unit case. Have your assistant raise the engine stand gradually while you align the drive shaft splines with the upper socket and the copper water tube that must fit into the lower pump grommet. Twist the propeller if you need to mesh the drive shaft splines, to mate the two cases.
Start all of the lower until bolts and nuts in by hand, starting with the trim tab anode nut. Use a socket or Allen wrench to tighten them gradually, rotating from one to another as your assistant raises the lower case in tiny increments. Tighten all the bolts with the Allen wrench or regular socket. Remove the lower case gear oil filler cap with a socket. Fill the gear case with oil, according to the amount prescribed in your owner's manual.
Do not attempt to start the engine until you submerge the lower unit in water, or use a garden hose flush device. Reconnect the negative battery cable with a socket.
Chris Stevenson has been writing since His automotive vocation has spanned more than 35 years and he authored the auto repair manual "Auto Repair Shams and Scams" in Stevenson holds a P. Step 1 Place the engine in a half-tilt position. Step 2 Unscrew the lower unit mounting nuts and bolts, located under the cavitation plate and through the side case, using a socket and wrench.
Step 3 Have an assistant help you lift the lower unit and place it in a marine engine stand. Step 4 Use a socket to remove the nuts on the plastic water pump housing. Step 5 Pull the impeller out of the housing bore. Step 6 Place a new kit gasket down into the pump housing, then the face plate.
Step 7 Slide the pump housing down over the shaft and onto the studs. Step 8 Move the lower unit under the upper unit case. Step 9 Twist the propeller if you need to mesh the drive shaft splines, to mate the two cases. References Sterndrives. Check the lower case oil level after your first use with the new impeller.
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