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.
- Thread starter andy r
- Start date
Janicholson
Well-known Member
Wrist pin noise is similar to that. If you are careful with the throttle, you can get it to do it almost continuously at a critical speed. If it is, it can last for years that way. Pretty difficult to be certain unless the engine is disassembled!!! Jim
MARK ROBKE
Well-known Member
Maybe something that got starved for oil on the hills,such as a rocker arm.Were they all free moving when you adjusted the valves,none of them stiff?You may have to loosen them and feel by hand.Mark
If it where my tractor I would drop the oil pan and look for metal in the pan. Plus inspect the connecting rods top and bottom. You can usually tell when one has be low on oil in that the heat will discolor the connecting rod. It will look different than the others.
I am really thinking you have a bad wrist pin bushing. It is then letting the piston slap at some speeds.
I am really thinking you have a bad wrist pin bushing. It is then letting the piston slap at some speeds.
I once had a 580 Backhoe come into my shop for an noise that would come and go on a regular basis, It had a worn brass bushing in the connecting rod at the wrist pin, the bushing was loose in the rod and would turn and the internal clearances were close enough to allow the piston to tap the head when the bushing was at a certain spot,
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