Cylinder scuffing

[pmax]

What causes this ?




Does the rest look OK ?

[cgarr]

Is it a stain or can you feel a difference?


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[faapgar]

Marks like that come from a motor that has sat for awhile.Dirty oil & rings getting a little rusty from moisture.Then they lit it up bringing it back to life.That motor was tight and cracked loose when they turned it over.Fred

[pmax]

Craig,
Feels a bit rougher.


Fred,
Yeah, that's probable. This is from a basket case 78 engine I'm tearing down.


Here's the corresponding piston.








BTW what's the trick to splitting the case ? Heat ? Hours of hammering with a mallet made no difference. Or is it possible I missed one nut ?

[safe]

Originally Posted by pmax

BTW what's the trick to splitting the case ? Heat ? Hours of hammering with a mallet made no difference. Or is it possible I missed one nut ?

99% you missed "the secret one". Have you got Waynes book?

[pmax]

Case split as per Mr Dempsey's excellent book and some perseverance and choice words ! Next goal is to see if this engine's worth rebuilding or better off as parts fodder.