Re: Assessing an unknown engine

Posted by Philmar Farms on August 07, 2005 at 14:06:23 from (65.26.209.254):

In Reply to: Assessing an unknown engine posted by L.C.Grey on August 07, 2005 at 09:53:37:

My experience has been that a spot of rust the size of a quarter across three rings will freeze an engine. Or the cylinder might be so full of rust you can"t tell the piston from the sleeve.Your oil will have hard time getting past a thick layer of rust. First things first. Pull the valve cover and make sure the valves are loose.Check the magneto drive. Penetrating oil:PB blaster,kroil primrose,ATF,or real turpentine. They all need time to work! Next you want to get the pistons moving. You can jack up one rear wheel and rock it with the tractor in gear some one working the crank. What I usally end up doing is pulling the head.While its off it can be inspected for leaks and valve condtion. Clean out the clyinder so the oil can get down along side of the piston. Vibration will help break the rust.A plate of thick steel on top of the piston and air punch will rattle good. I always seem to end up with a block of wood and a sledge hammer. The block should be of good hardwood. Turned round and cupped on the bottom so the force to the edge of the piston not the face. Remember that another piston maybe stuck. A loose piston should wiggle enough to see the oil move around the edge. Any of these procedures can cause unnormal stress on engine parts! Lots of luck[you can"t get it at the parts store]

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