Definitely a good core for a rebuild. I am pretty sure your gonna need pistons. A good fit with the rings pistons and cylinders, is the key to a great running motor, for a long duration. Your going to love that rebuild. How are you going to stop yourself from putting it in right away!?
Last edited by bmorgil; 02-24-2020 at 07:36 AM.
pistons?? All depends on what the micrometer says?? Put it in just dont know??Originally Posted by bmorgil
brings up a question. when do you decide to scrap pistons?? i am hoping to use 10thousan over rings
Last edited by pelago; 02-24-2020 at 01:33 PM.
You reuse the piston (if it is in good shape) if it is within the specification of fit for the bore to cylinder, and the ring lands are not worn. In general in our f & L 134's if the bore is .009" larger than the piston, the cylinder should be increased to the next standered oversize. This would be the over bore size it takes to remove all imperfections and taper. The cylinder only wears at the very top. The first half inch is where the wear occurs (from the pressure of combustion). It is not uncommon to see no wear at the bottom of the cylinder. If you bore more than .040" you should have the block checked for thickness. From the looks of the bores it appears it has some miles on it as well as a good deal of rust in the bores. After the block is cleaned the machinist will check it over with some precision bore measuring gauges. He will let you know what you need to do. If you don't see any visible damage in the cylinders and there is just rust, I would bet .010" oversize pistons and rings, and a bore and hone will have that baby "hummin".
All said it is very good practice to re bore, hone and fit the pistons and rings perfectly. This is the place to spend your time and money if you want a really sweet running motor for a long time.
Last edited by bmorgil; 02-26-2020 at 09:09 AM. Reason: spelling
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