When you say "timed" I'm not exactly sure what you mean. There is time of injection pulse at the pump , time of pulse at the injector, time of injection in the combustion chamber, and time of actual combustion. There can be a 4-6 degree difference in lag. Depending on what someone is trying to check, "air timing" can be used to verify static timing, or factory pump timing marks can be used if they are known to be correct. A timing light can be used to check injection pulses on an injector line and a luminosity probe can be used (on some engines) to check actual time of combustion.
For Deere, Stanadyne gives time of injection pulse at the pump only, along with whatever range the automatic advance provides. Standadyne also gives specs per pump # of exactly what degree point the timing mark is etched on (and it differs). It also dumbs things down a little since when installing a pump -we assume the timing marks have been put in the correct place on a degree wheel.
One nice thing about JDB pumps on most Deere machines is an easily adjustable timing advance that can be correct on a running machine with no special tools other then a $10 plastic timing window.
My main point in regard to commenting was to the claim of setting the timing to "10 degrees BTDC." Regardless if that is a recommendation for pump degrees static timing (which equals 20 engine degrees at the crank), or for 10 engine degrees (5 pump degrees) . . it represents a problem on an engine if the advance is working properly. To the converse - it can be a short-tern "easy" fix for an engine that has a totally non-working advance.
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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
... [Read Article]
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.