Right here we go, my lovely engine is at it still/again.
As some might remember i have just spent in the region of 300 quid on it to get it going... and now its going, pulls prettymuch first start etc, enormous whack of power compared to what it was when i got it.... Now here's the snag...
When I fire up the engine and its cold, the tell-tale pisses out water at quite a pressure... it will continue doing so until the engine starts getting warmer.. it will get warmer and the tell-tale lowers pressure, and when its warm, the tell tale just vanishes and all you can see is a small dribble running down the side of the head.
I blew compressed air through the tell-tale hole and its clear, also blew through the flush port bit.
The manual has NOTHING about a (dodgey) thermostat or anything that controls the flow.
As soon as the engine cools down, tell tale comes back up... Perhaps its warm bearings expanding, or rubber seals expanding?
As you might think, i am a bit worried and dont trust this engine the way it is...
Any ideas? Am i going to have to take the lower leg out and take the pump to bits and stuff (again)?
The impeller was replaced during the winter months when it was in "storage"...
EDIT: Its a 1972 20HP Mercury Blue band. "Belgium" edition.