Posted by Michael Price on May 16, 2009 at 20:04:33 from (205.188.116.74):
This is on a trencher, its a VG4D V4 wisconsin. It ran fine and I put the trencher back on the machine and went to try it. I got it at auction in pieces so I put it back together.
When the trencher was digging the engine started to squeal. I got it apart and found #4, the one with the discolored valve had a tore up connecting rod bearing and the cylinder is scored and the piston if tore up. It always had oil pressure. #2, the one next to #4 had a little wear on the clyinder and bearing. 1 and 3 on the other side of the engine are in real good shape. Any ideas what caused this?
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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