Over flowing Drive fluid
 

Last two times out under hard running the port res bottle was overflowing. After shutdown it went back to normal level.
Under 'normal' running it does not do it. Only long WOT runs.
What are your thoughts?

Re: Over flowing Drive fluid
 

Is this a new condition or setup? If nothing has changed I would suspect you have a bearing in your drive starting to go. How does the fluid and magnet look? I had a similar situation and upon tear down discovered a bad pinion bearing.

Re: Over flowing Drive fluid
 

same setup for the last 5 summers

could it just be the oil heating up too much?
The cooler line was plugged with milfoil :(

Re: Over flowing Drive fluid
 

simple one, but have you checked the gasket in the screw on cap? mine fell out while changing fluid and did the exact thing. bought new caps with gaskets in them, problem solved.

Re: Over flowing Drive fluid
 

this is correct check for gasket as stated above if gasket is there then it sounds like you have a bearing heating up ( first sign of major drive problems)