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Discussion Starter · #1 ·
Hi
Just received new barrels, pistons and rings.
The workshop manual advises: "When fitting new piston rings, the bores must be lightly honed with a fine-grade emery cloth so that the new piston rings can become bedded down properly. .... The recommended grade of emery for this purpose is 300."
Does this still apply for new barrels?
It looks as if the cylinders have been honed by a machine...bit dubious about doing this.
Cheers!
 

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Caulky, The manual is talking about rebuilding where you just replace the rings in a used engine, not new, or just bored...Your find to go...
Cheers, MM
 

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Discussion Starter · #3 ·
Thankyou Mastiff-man, I had a feeling that the rings would bed themselves in with a new barrel.
Better to be safe than sorry.
The old barrels were knackered and I didn`t fancy honing the new ones.
The gap was .019 in the old cylinders and they were tapered. The old barrel was + .040 and re-boring was going to cost as much as buying new barrel. Lots of smoke and oil loss.
Piston ring gap appears to be between 15 thou and 12. I.e 15 dont fit 12 fits.
The oil rings are about .010.
Update later.
 
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