Those 6.2s are known for the fuel advances being the first thing to wear out or get weak on the DB2 pump. With military rigs, they wear even faster because of the JP8 military fuel. So, if anything, I'd suspect the advance of being worn and not moving enough. I doubt it's sticking, more apt to have low fuel pressure or leakage.
Funny thing is - when those pumps are used on most farm tractors (IH, Deere, Ford, AC, Oliver, etc.) they have a steel cylinder with a piston riding inside with a sealing ring. But . . . on the 6.2s, they use a piston riding directly in the soft aluminum bore of the injection pump housing. The setup tends to wear.
A very general rule-of-thumb is this. When you first start it cold, and rev the engine up in neutral (i.e. no load), does it rev smootly, or does it break up? If it breaks up no-load, but tends to smoooth out when you actually drive it, the advance is probably too retarded.
Easiest work-around is just unbolt the pump and physically move it 1/16th or 1/8th of an inch to advance. Yes, this will also change the static timing, but it usually does not hurt a thing. In fact, it will often improve cold starting.
There were many service bulletins for your engine posted by the US Army and the wear problems associated with the thin JP8 fuel.
If you really want to know for sure, and don't like guess work - you're going to have to get your hands on a timing light. Either powered by a Piezo microphone that hooks to an injector line, or the more pricey luminosity probe that screws into a glow-plug hole.
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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
... [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.
