Ok here is the full story. I have had the tractor for eight years. I have ran it those eight years many of times at parades and tractor shows. It had an old oil pressure gauge on it that didn't work. I assume it was getting oil and had oil pressure those eight years because its never had any problems. I bought new gauges for it back in July. When I got those installed I noticed the oil pressure gauge said nothing. I quit working on it till now. Yesterday I decided to change the oil and filter cause it had never been done. It had lots of sludge in the bottom of crankcase. I cleaned it out and refilled with oil and new filter. I started it up and after running for a minute it started knocking. Shut it down immediately. I know that changing the oil and filter should not make it stop getting oil but it must of been getting oil previously since in never knocked before. That's where I'm at now.
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