Posted by WonderingAl on November 24, 2007 at 21:44:16 from (66.32.254.68):
A 1953 super M has a high oil pressure, top number on the gauge. The oil is checked..both "petcocks" (spelling?) have oil coming out when loosened. radiator is good, engine sounds good but why high oil pressure? Temperature gauge is in the cold range also. To the kicker,...driving it slow in 1st gear, cold morning, engine had warmed up...and heard a LOUD "bang" from the engine area, then from an otherwise nice sounding engine...comes a "knock-knock" sound as the engine ran. Quickly put tractor in shed..close by thank goodness. Several hours later turned it over again to confirm...knock still present with some thick black exhaust...turned off fast and plan to let it sit until figure things out. Any ideas on the high oil presure? Any ideas on the "bang" and then the knock-knock noise...the black exhaust?
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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