Posted by Owen Aaland on May 26, 2013 at 00:55:26 from (216.47.34.124):
In Reply to: WD9 has a knock. posted by Grabatire on May 24, 2013 at 19:52:41:
Your description of the noise is consistent with having something stuck in the top of a piston and hitting the head. When the engine is cold there is enough clearance so it does not hit. As the aluminum piston expands with heat the foreign material starts to impact on the head.
This type of noise, unlike a loose bearing, is not likely to change much depending upon whether or not the cylinder is firing.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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