Posted by andy r on November 10, 2015 at 19:25:49 from (75.91.149.15):
I am trying to determine what the noise is in the engine of a John Deere 2840. The engine starts readily and idles fine. Rev the engine up and it doesn't miss a beat. Engine sounds strong. Tractor looks to have been well kept and although the tach doesn't work it only shows 1600 hours. The tractor is owned and used by a Christian camp so I am just helping them out free of charge.
With the hood off, your ear towards the valve cover, and the engine running at a high rpm a slight tapping noise occurs roughly every 3, 4, or 5 seconds. The noise lasts only 1/2 second maybe and really seems to have no relationship to rotating or linear part movement. The noise sounds like tapping a pencil on the edge of a table as hard and quickly as you can. During that 1/2 second there might be roughly 3 taps, then it is gone for 3 - 5 seconds before you hear it again. It continues to repeat. At low rpm's the noise isn't there so much. It certainly isn't a rod, main, or piston.
I thought it might be the hydraulic system calling for hydraulic pressure due to an internal leak and momentarily loading the engine every 3 to 5 seconds. I did remove the piston pump coupler between the pump and engine and the sound still occurs.
I don't know where to look now. I need your ideas. Could it be valve train clearance? Pulsating diesel fuel flow? Air in the fuel system? Thanks for your ideas.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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