Posted by andy r on November 23, 2015 at 18:24:05 from (166.181.82.185):
I posted a couple weeks ago about the John Deere 2840 tractor with some tapping/light knocking noises which seem to be in the upper end of the engine. The tapping is not continuous, but every few seconds (maybe 4) and then it lasts only a second. Anyway, I did disconnect the front mounted hydraulic pump - no noise change. Then I disconnected the water pump and alternator - no noise change. Pulled the valve cover and adjusted the valves (they weren't bad) - no change. Cracked the injector lines at the pump one at a time to deaden each cylinder and really couldn't take the noise away when I did that. This is a church camp's tractor. The manager of the camp did say it was low on oil and they were operating it on some pretty steep hills when the problem started. So, what damage could they have done and where is the noise originating? It sure doesn't sound like a main, rod, or piston as it isn't continuous with every stroke or revolution nor is it loud. Any ideas will help. Thanks.
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