I should should probably hone these, right?

[jrs_diesel]

I am rebuilding my 72 Johnson 6HP. Tonight I got the crankcase seperated, and the crank and pistons out. The crank and connecting rod bearings looks and felt fine.

My upper piston (#1) pushed out just fine, but my lower piston (#2) took a little more force to push out. The lower piston was also scored slightly, but I observed no damage to the cylinder. The cylinder walls are smooth (felt with my finger), no scatches or other visible damage, and I still see the original cross hatching.

I've attached several pictures. The first two are of cylinder #1 (upper), and the last 2 are cylinder #2 (lower).

How do they look and should I hone them? I am replacing the piston rings either way.

 

[Mas]

Re: I should should probably hone these, right?

Being that I see rust, a "very light" hone should clean that up. Is it the picture, or am I seeing even cylinder wear? Maybe just where the piston sat?

Mas

 

[jrs_diesel]

Re: I should should probably hone these, right?

Being that I see rust, a "very light" hone should clean that up. Is it the picture, or am I seeing even cylinder wear? Maybe just where the piston sat?

Mas

Didn't feel like any wear, but I see where you are talking about. This motor sat for about 10 years before I got it. The pistons were not stuck, and moved freely when I first tried to pull the rope (well before I tore it down).

 

[Mas]

Re: I should should probably hone these, right?

Why did you tear it down?

Mas

 

[jrs_diesel]

Re: I should should probably hone these, right?

Why did you tear it down?

Mas

http://forums.iboats.com/showthread.php?t=378227

I knew this motor needed some work after having sat for 10 years (water pump and point ignition check and repair). One thing kinda led to another as I started fixing it up.

Noticed some corrosion around the cylinder head. Started to take that off. One bolt head snapped, which led to me removing the powerhead. Then taking off the exhaust cover to get the head off. Found the lower crankshaft/driveshaft seal spring broken. Got the head off and stuck bolt extracted. Found some corrosion in the water passaged that needs to get cleaned. Then I looked closer at the pistons and saw the lower was scored. After that I thought, if I've gone this far, lets do the full rebuild!