Evinrude 9.9 hiss

[sasko1980]

Hi all, - the story.
Evinrude 9.9 BALCRA 1984

I had to take powerhead apart due to clogged water p***ages.
I bought new gaskets, seals, exaust tube gasket ..etc

I re***embled the motor and it fires up nice. On first pull.

Today i noticed that when i turn flywheel by hand it has a little hiss, like air coming out somewhere. I found the problem.The spark wasnt too tight and the air was going out. Re-tightened all ok.
Now there is no hiss/air from spark but i can hear it from the exhaust.
I pulled the head from the middle section and on the bench, when I turn the flywheel it gets like hiss/air slowly from the exhaust.
Is this normal or what???

P.s. new rings installed on both pistons

Help!

[Joe Reeves]

You didn't trap a snake in there somewhere did you?

Seriously.... I never heard anything like a hiss with the thousands of engine I worked on, however it may have been there. I'd suspect that what you're hearing is the compression or crankcase pressure escaping through the end gap of the piston rings.

[sasko1980]

Is this normal or not??
This motor starts fine and it works. So im puzzled about this snake inside:-)
This hiss or air escape comes when the flywheel is rotated with a hand slowly . I cant tell if its no1 or no 2 piston when it comes to top of cyl

[Joe Reeves]

Originally posted by sasko1980 View Post

Is this normal or not??
This motor starts fine and it works. So im puzzled about this snake inside:-)
This hiss or air escape comes when the flywheel is rotated with a hand slowly . I cant tell if its no1 or no 2 piston when it comes to top of cyl

I don't know what to tell you my friend. I have never encountered that hissing problem and I've worked on these things from 1960 to 1991 (retired). Since there isn't much activity here, I suggest you go to MarineEngine.com or iBoats.com with that question. Perhaps one of the members there has encountered that problem. (Joe)