Take off gearbox
SOURCE: CHANGE WATER PUMP IMPELLER FOR EVINRUDE OUTBOARD MOD# E28ESLETD
Crowley Marine Boat Parts & Diagrams have diagrams of all the components, and the catalog is easy to go through to pull them up, OEM and other brands, no cost for the images.
SOURCE: how do I change the water pump impeller on a
get the kit from boat shop all it takes is four bolts and remove the lower housing.. when you put the impeller in... flex the blade the same way take a photo before you take it apart...inside get a new gasket for between the upper and lower housing too...
SOURCE: Mercruiser 5.7 litre inboard engine Impeller fault
i have a 5.7 v8 4brl in my boat with top water exhaust and my valve cover filter tubes are sendig excessive moisture into my carb . why
SOURCE: older mecury wont pump water
Never had a good water pump caviate. You may have a problem with your powerhead causing exhaust to enter the cooling system. This could be any thing from the head gasket beginning to fail, the exhaust cover plate and baffle having gasket or corrosion issues or even the powerhead base gasket or water tube "O" ring being rotted out from around the inlet pipe.
Before you do any of that-- pull the drive off the motor, drop it in a bucket of water and spin it with a big drill. If the key way is in correctly it should spit water vigorously out the outlet.
When you put it back on, put liberal grease in the pump outlet and check the "o" ring burried down that hole. Then find the tube guide and put it on the pump at the outlet. This will make sure the tube actually goes in the pump.
So now you are sure the pump works and the tube is in the pump, with this knowledge-go on the search for the real problem. I would first drop the exhaust plate off the side of the motor. Take the baffle to the wire wheel and clean the scale off it and hold it to the sun look for pin holes. Inspect the gasket areas for burn outs. If the gaskets are in good shape- leave them alone and put some sealer on the clean side. You can do more harm than good by scraping a perfectly good gasket.
Next would be pull the power head. This will give you a look at the water tube where you can check for pieces of old water pump. They get stuck where the water tube from the pump enters the power head base. Also see if the tube has been pushed up into the power head a blocked the water flow. If so just push it back into the pump.
Last is the head gasket. Just put in a new one. Look for burn outs and carbon tracts into the water jacket.
If none of this works- I don't know what to tell ya.
SOURCE: 1991 yamaha outboard motor leaking water from bottom
Under The Water Pump Is A Seal Plate Which Has Two Shaft Seals And An Outer O Ring Seal This Is Probably Where Your Problem Lies.
have you changed the impeller inside the lower unit.
There is copper pipe to redirect water up into the engine.
When you replaced the impeller make the copper pipe is insert onto the engine.
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