Broke ring

[pita482]

1993 120hp force broke a ring and it caught the exhaust port, can I bore the cylinder or do I need to re sleeve, will the damaged exhaust port cause running issues?
Please see pics!
And thanks in advance for your replie

 

[Scott Danforth]

With that scoring, youre looking at a bore and hone with new pistons as minimum

 

[pita482]

For sure a bore and hone, pic makes it look worse, can barely feel it but it is there, was wondering if the damage to that one exhaust port would have any issue on how it runs?

 

[jerryjerry05]

No the damage will be fixed when the bore job's done.
​I file and clean the edges on all the holes when redoing the cylinder.
You need to take to a machine shop and see what the guy suggests?
​It might look tiny but usually .020 is what's needed.
The guy at the shop can tell you???
​Usually a re-sleve isn't needed.

​FrankA cut the intake and exhaust ports to help it breath better and said the increase in HP was noticeable.

 

[gm280]

Only a competent machine shop can tell you if a bore will clean it up enough to do that with new piston and rings of course. I don' see any real issue with the exhaust port myself. It look like you can salvage that engine and make it run again. JMHO

 

[Jiggz]

The issue with the exhaust port can easily be fixed by chamfering the edges. Remember, there is very little compression area affected by the scoring. Now the scoring on the compression chamber is somewhat subjective. If the cylinder is still an original bore, you can try cleaning it up with a cylinder hone up to next size. Replace piston and rings with next oversize ones as appropriate. Check for compression and if you get anything above 100 PSI that motor should still be good. While at it, chamfer all the inlet and exhaust ports on the rest of the cylinders to prevent future problems.

 

[jerryjerry05]

Compression test: the actual reading is subject to the quality of the gauge.
The readings on each gauge can read as much as 50# difference??
​The results should be that all cyl. are within 5#-10# of each other.


​My 3 cyl. 85's if the comp goes much lower than 5-10# lower than the others it starts being hard to turn over and doesn't like to start
​Some later years were made to have lower comp on the top/bottom than the center cyl.
Can't remember the years that was done?
Someone might add that later.

 

[pita482]

Thanks guys!