Looking for advice on re-ring job.

[Pres228]

Hello, everyone. I am posting in hopes of getting some advice please. This is my first re-ring on an outboard. I have a 1990 Johnson 200 gt. Lowest port side cylinder (I’m calling it #6) had impact marks on top of cylinder perimeter and inside the head perimeter. The marks were in the pinch area and the top ring of this piston was seized but intact. This piston compression was at 50 psi, while all others were at 95 psi. The piston just above this number 6 piston (I’m calling it #4) has a very small chip at the exhaust port. I am trying to upload a picture. Other than this chip, all cylinders are smooth and in what appears to be great shape. My question is should I give up on this motor? There are small lips on the exhaust ports and I would like to just take my Dremel and grind this down. Good idea or bad idea? Any information is greatly appreciated.
Pres228

 

[flyingscott]

I would do a complete rebuild with all new pistons. The crossflow motors are notorious for breaking piston rings. It is only a matter of time until the other 4 go. I would also not trust those pistons on a re-ring because the ring grooves are worn.

 

[Pres228]

That sounds like a good idea. I have them all out anyway. Why not put in 6 new ones? They don’t look to be terribly expensive. Do you think the chip off of the side of the exhaust port inside the cylinder is a big deal? Could I get by with grinding it down? Thank you for your help.

 

[Pres228]

 

[Pres228]

For the life of me, I can’t get my phone to upload the picture.

 

[fdrgator]

Maybe the picture is too big. Resize it.

 

[racerone]

Flyingscott--------Is the motor in question a " crossflow " type motor.

 

[faztbullet]

"Mike" the cylinders first as the open deck blocks wear at a taper....it most likely going to need bored

 

[Pres228]

 

[timguy]

BOAT, break out another thousand. The rebuild kit will probably run about 1,300 for this motor add your machine work, your own labor, and I'll tell you what, it better be a pretty nice motor to start with.

 

[flyingscott]

Flyingscott--------Is the motor in question a " crossflow " type motor. If its not why don't you say something. If it is a looper motor my advice stands do it right.

 

[Pres228]

Help. How do I tell if it’s “crossflow” or not?

 

[flyingscott]

A looper has flat top pistons. A crossflow has a deflector built into the piston.

 

[Pres228]

Thank you. This is a looper motor then.

 

[faztbullet]

See post #8...I have not see a open deck block that did not need boring..
open deck

closed deck

 

[timguy]

Pappy, what are those retarded engineers thinking? A child could see this open deck is going to create problems. There is so much stress there at the top of the cylinder, WTF? Look at even the compromise to the head bolts.

 

[Pres228]

My laptop is at work and I cant upload any photos from my phone. I will get to work Monday and try again. Thank you for helping me.

 

[racerone]

But many fine motors are " open design " so why the slam ??

 

[flyingscott]

I blame the open design on Ethanol. That stuff is sneaky.

 

[timguy]

Okay, I'll back down. Personally, I prefer a closed deck for better integrity of the upper cylinder, head gasket and headbolts.

 

[timguy]

Mr. Scott, do you still have that link to the information you posted on VRO's a few months back? There is a post here on VRO replacement that your info would be very helpful. It's titled:
"2000 Johnson 70 HP pre purchase.......", thanks.