Posted by Phil25 on July 16, 2013 at 04:29:27 from (24.222.69.53):
Morning: I got the quick pleasure of looking at why a MTD lawn tractor with the Tecumseh engine, backfired and died... I found the exhaust valve push rod was off the rocker, and no compression, had the valves reseated/new head gasket, and valves operating proper. Still no compression, and it pushes air out around the pushrods[through the guide tubes] on the compression stroke,slight sucking of air through the oil fill stand pipe, same when the exhaust is covered with your palm. When the valve cover is held in place enough air comes out the two securing holes to make a hissing noise. I suspect broken ring[s]? Anyone able to confirm for sure or some other reason,better to have the owner go for a replacement engine? Tks for reading.
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