I purchase a 9.9 HP Evinrude that was seized.
I knew it was seized, but I hopped to get it running, or strip it down for parts.
Hopefully to get running because I really like these engines.
So, year is 1977 # 10755A
Power head plug is 155040 (Same year? Different year?)
I'm guessing it isn't the original powerhead, as its dark blue, and the body's original color was light blue.
So I didn't want to just throw a breaker bar on the flywheel to un-stick it, I wanted to fix the problem.
I removed the lower unit hoping it was the problem, well it wasn't. Block still seized.
When removing the powerhead, this fell out.
And I thought I was going to have problems.
Powerhead came off just fine though.
I removed this:
To find this:
How does sand even get up there?!
So, the flywheel could rock back and forth a hair, so I was fairly certain it wasn't the pistons that were stuck.
I clean the bearing with penetrating oil, soft brush, and compressed air. It looked a little dirty/rusty, but much nicer.
I pulled the side covers, pistons looked fine. no deep lines or rust or anything.
Then pulled the head.
Top hole:
Bottom hole:
The liquid stuff you see is a combo of raid, penetrating oil, WD-40 and whatever other liquid I dumped over/down/in this thing.
Now, at this point, the thing was moving freely again. No forcing or anything, just unstuck itself.
Probably for all the moving and tapping I did getting the stuff apart.
I cleaned all the sand out I could at this point.
Here is the bottom cylinder:
Overall, seems like a nice engine.
Every bolt came out, nothing broke.
Electronics look brand new. Paint on block looks great & factory.
So, a new bearing is about $22 and $30ish for a gasket kit.
I could probably get her back together for less than $100?
In your opinion, what should I do?
Fix it?
Put it back together and see if it starts?
Put it back together and do a compression test?
It seems there is still sand in the cylinder heads, and probably in/around the crank case, so I don't want to rotate this anymore than I have too. If its even sand? It probably is, doubtful its carbon build up.
And really, how does this happen? Sand IN the block?
Made it up the shaft, into the crank, and into the cylinders?
I knew it was seized, but I hopped to get it running, or strip it down for parts.
Hopefully to get running because I really like these engines.
So, year is 1977 # 10755A
Power head plug is 155040 (Same year? Different year?)
I'm guessing it isn't the original powerhead, as its dark blue, and the body's original color was light blue.
So I didn't want to just throw a breaker bar on the flywheel to un-stick it, I wanted to fix the problem.
I removed the lower unit hoping it was the problem, well it wasn't. Block still seized.
When removing the powerhead, this fell out.
And I thought I was going to have problems.
Powerhead came off just fine though.
I removed this:
To find this:
How does sand even get up there?!
So, the flywheel could rock back and forth a hair, so I was fairly certain it wasn't the pistons that were stuck.
I clean the bearing with penetrating oil, soft brush, and compressed air. It looked a little dirty/rusty, but much nicer.
I pulled the side covers, pistons looked fine. no deep lines or rust or anything.
Then pulled the head.
Top hole:
Bottom hole:
The liquid stuff you see is a combo of raid, penetrating oil, WD-40 and whatever other liquid I dumped over/down/in this thing.
Now, at this point, the thing was moving freely again. No forcing or anything, just unstuck itself.
Probably for all the moving and tapping I did getting the stuff apart.
I cleaned all the sand out I could at this point.
Here is the bottom cylinder:
Overall, seems like a nice engine.
Every bolt came out, nothing broke.
Electronics look brand new. Paint on block looks great & factory.
So, a new bearing is about $22 and $30ish for a gasket kit.
I could probably get her back together for less than $100?
In your opinion, what should I do?
Fix it?
Put it back together and see if it starts?
Put it back together and do a compression test?
It seems there is still sand in the cylinder heads, and probably in/around the crank case, so I don't want to rotate this anymore than I have too. If its even sand? It probably is, doubtful its carbon build up.
And really, how does this happen? Sand IN the block?
Made it up the shaft, into the crank, and into the cylinders?
Last edited:
