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| How to polish 70hp cylinder walls |
| Author |
Message |
    
David Maybury
Member
Username: davenaus
Post Number: 22
Registered: 08-2009
| | Posted on Tuesday, October 27, 2009 - 04:21 am: | 
|
I have some surface damage to a couple of cylinder walls in 1980 70Hp Johnson. What would I use to polish out the damage? What would be best to polish out damage on piston sidewalls as well? Thx, Dave |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 4315
Registered: 04-2006
| | Posted on Tuesday, October 27, 2009 - 04:35 am: |
|
Damaged pistons: REPLACE!
If cylinders are damaged in a way you may 'feel' it, re-bore to oversize.
In your case I think re-bore to oversize with new pistons seems to be solution. |
Glenn Simpson
Member
Username: trackhappy
Post Number: 22
Registered: 07-2009
| | Posted on Tuesday, October 27, 2009 - 09:28 pm: |
|
If this were an old car you could get away with some polishing on the pistons, but the bores need to seal on the rings perfectly. This ain't a car though, and your life might depend on this baby pulling hard at a critical time (like going over a bar or the onset of a storm for example). Listen to Morten on this one. Not worth the risk. |
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