Overheating

[jbabcock]

Hi, All i have aevenrude 15 hp 1986 dosnt seem to have a thermostate hopusing so im not sure about that however i just replaced the impellor it began to pump water again but will only pump at idle when rpm and motor is running in high impellor quits pumping andf motor begins to quickly over heat any thoughts on this....?

 

[Daviet]

Re: Overheating

#19 is the thermostat.
I have seen a defective head gasket cause your problem. As the rpm goes up exhaust from a cylinder will pressurize the cooling system and stop water circulation.
http://www.ishopmarine.com/ishop/js...CatFilter=BRP&eCatSupFldr=supplier-100-005-EJ

 

[jbabcock]

Re: Overheating

humm i was hoping that wasnt the case could it be that the water pump housing isnt working properly as i just replaced the impeller and not the housing the housing has alot of melted debris in it that i tryed to sand most of out as well the slip plate had womn groves in it or is this sounding more like ahead gasket to you then anything?

 

[Daviet]

Re: Overheating

If the water pump housing and plate are damaged, they should be replaced or it could damage your new impeller.

 

[jbabcock]

Re: Overheating

Just wondering if anyone has any ideas about ifi have to lift the engine to get the water housing off to get to the thermostat and head so i can replace the head gasket it seems very close to the body of the motor housing and if so how is it i can get the motor out and is it very difficult im a bit of a novice at this.