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Since i changed the water pump on my 40 evinrude (1990) i see water coming from housing(midway up to head)and dont have much water pressure when running any suggestions appreciated.

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Do you mean the cylinder head gaskets leaking ? try removing the gearbox and fit hose to the intake water pipe and turn the water on and start the engine and see if cooling improves ! check for leaks again and if head gasket is leaking then replace it !

Posted on Jul 08, 2014

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How does pressure tanks work


Pressure tanks do just that in a water system. They create pressure for water to flow when the water pump is on the off cycle. A manifold is plumbed into the tank from the main line coming from the well. The main water line continues to the house plumbing from the manifold. So it's line from pump to manifold - to tank, and from manifold to main into house. The manifold also has tappings for the pressure gauge and the pressure switch. The pressure tank creates water pressure. The water does not flow through the tank. Pressure tanks also have to be 'tuned' or adjusted to the low end pressure set by the pressure switch. Actually the tank pressure needs to be set 2psi below the low end pressure. Most residential water systems are set to operate between 20 -40, or 30-50 psi, which is set by the pressure switch, which in turn , turns the water pump on and off. So if a system operates between 20 and 40 psi, the pre-charged pressure of the tank should be 18 psi. Pre-charged means the tank is drained of water with the water pump OFF. The tank pressure is then checked adjusted by way of the air valve on top of the tank ( A tire gauge works). Pressure tank mainfolds are a common plumbing part.

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Okay this is on total memory. The shift shaft for a lot of those engines goes right up through the pilot shaft and exits just in front of the block under the carburetor(s). You will see the **** linkage arm connected to this shaft sometimes it's double nutted. See if you can slide the lower unit back up to the housing and put a bolt in it to hold then undue the shift shaft linkage, Remove the bolt and drop the lower unit. Be careful of the water tubes and check make sure the rubber grommets are in place in the pump housing not on the tubes. Clean up the pump housing and install the new impeller kit.
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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.

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