how hot is too hot ?

[greasemonkeyjmj]

I have a 1989 evinrude 25 horse that was bought not running. the PO said it ran hot and died. i did a compression test and got around 65psi on both cylinders. what i am wondering is ,can you get these engines hot enough to ruin the block ? this one got warm enough that the plastic clips that holds the wiring around the back of the head melted and burnt to a crisp. i pulled the head off and cannot see any meltdown from the top of the pistons. but the cylinder walls have turned to a really dark color and i am concerned about that.I didnt know if the cylinders could get hot enough to more or less crystalize or something to that effect.


thanks

 

[boobie]

Re: how hot is too hot ?

What did the head gasket look like ??

 

[greasemonkeyjmj]

Re: how hot is too hot ?

it is really hard to tell as the paper part of the head gasket got so hot that is just crumbled when i pulled the head. but looking at the metal ring part of the gasket around the center it doesnt look like it was blowed towards the outside. but it does look like it may have been blowed across the thin section between the 2 cylinders. the current owner had actually gotten it started but it would only start and run at a high rpmif u tried to slow it down any, it would die out.