Re: Evinrude 5520 5.5 hp pistons

[Buccaneer]

Worked on the Fisherman some more today, and changed my
mind on the piston gouge / score being on the intake side….
it’s now on the exhaust side! I found no missing parts, i.e.,
throttle plate screws, reeds, etc., that might have got sucked
into the cylinder. How does a person know if a scored piston
is heat related, lean condition, or debris sucked in?
Half the rings were stuck from carbon, so I don’t think it was
lack of oil!
Photo of the scored piston…….
Scored piston
http://grayhitandmiss.com/Outboards/piston2
Toss or use?

Wondering why there looks like there should be a core plug here,
but there’s no holes drilled that I can see.
Core Plug Missing?
http://grayhitandmiss.com/Outboards/core_plugs.jpg
Should there be a core plug here?

I’m thinking when I removed the intake manifold, that I might have drove
the dowel pins the wrong way. Are they tapered?
They seem stuck now….. may have to heat the block to loosen?
http://grayhitandmiss.com/Outboards/dowels

Trying to determine if I have all the bleeder holes unplugged.
It appears that excess fuel drains from tiny holes A1 and B1,
and go out A2 and B2, then exits into the lower unit.
Is there any other circuits I’m missing?
http://grayhitandmiss.com/Outboards/bleeder_valve

Thanks for the help, Bucanneer

Prepare to be boarded!