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.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
