Posted by dgasper on February 16, 2013 at 15:04:42 from (24.4.226.154):
This is from my brother Steve in WI:
This is a photo of the rotor in the distributor on our 722 Bobcat. The 722 has a 98 CID Ford gasoline engine, it's an industrial version of the engine that I think was used in Pintos.
The distributor is made by Bosch. Parts are hard to find. Our local NAPA guy was able to cross reference the Bosch numbers and get NAPA stuff.
After installing all of the new stuff I expected the Ford to crank right up. Much to my dismay it was completely dead, no fire at the spark plugs at all.
It had me baffled. Thinking maybe it was a bad ignition switch I checked the power to the coil, it had 12 volts in both the 'run' and 'start' positions. I checked the new condenser, even replaced the coil and spark plug wires. Still no spark.
Yesterday I cranked the engine while my helper held the primary wire from the distributor close to a grounded part on the engine. A spark was there but we still had nothing at the spark plugs.
I pulled the distributor cap and rotor off and checked them with an Ohm meter. The cap was good but the brand new rotor was open between the center contact and the tip of the rotor.
If you can see it in the photo, the center contact is a silver color, the tip of the rotor is copper colored. It's all sealed in but apparently it's made with two parts of metal and the two were not in contact with each other.
To make sure of things, I took my VOM along when I exchanged the bad rotor at the NAPA store. The replacement rotor did show continuity between those two points.
The Bobcat likes the new rotor a lot better. It sure was good to hear the Ford come to life, I was beginning to wonder if it ever would.
I have run into bad spark plugs and bad condensers right out of the box but never a bad rotor. Before I checked it yesterday it hadn't occurred to me that a rotor could be defective.
BJ at NAPA has been in the parts business for a long time. He had never seen it before either.
It is even marked Made In USA, could understand it if it had been made in China or Mexico.
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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[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.