Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

John Deere Tractors Discussion Forum
:

Fairbanks RV2B

Welcome Guest, Log in or Register
Author 
Jerry Pevehouse

05-05-2008 13:39:13




Report to Moderator

Well I have had hell with 3 RV2B mags. Sent one off 2 diffrent times to get it back finally hot. But when on the tractor, Almost always will not impulse on the #1 cyl. It will always impulse on the #2, and will get the tractor started if you have enough persistance. I imagine, that if it hit on the #1, the #2 would help keep it going to start easily. Once running, the tractor ran perfectly. My question is, what is wrong with the impulse, can a non-magneto minded guy fix this, or do I have to send it to the pros for a third time. (And no, I won't use this guy again)
Thanks for any help, and be reminded, that I have restored many tractors, but have always left the mags to the guys with proper equipment, (and knowhow). If I could be coached on a easy fix, I might be persuaded to fix it myself. Thanks, Jerry

[Log in to Reply]   [No Email]
MCD

05-09-2008 16:00:25




Report to Moderator
 Re: Fairbanks RV2B in reply to Jerry Pevehouse, 05-05-2008 13:39:13  
One other cause of your problem is a weak magnet. After it cranks the rotor is spinning faster and changing polarity quicker causing an increased spark output. The RV series are some of the worst about magnetism, maybe partially because of the material used but for sure because of the way the magnetism is conducted in the rotor.

[Log in to Reply]  [No Email]
Duane Larson

05-05-2008 14:53:04




Report to Moderator
 Re: Fairbanks RV2B in reply to Jerry Pevehouse, 05-05-2008 13:39:13  
Jerry,
The DRV2B series used three different impulse units - each improved over the previous (in principle anyway). It's not unusual for the trip dogs to wear, and/or the pins the dogs pivot on to wear or become loose. In addition, the threaded pin on which the dogs catch can also wear. It sounds like you have one worn dog end, and when this dog catches the stop pin it rides over the pin. This wear can be subtle, especially if it only misses catching occasionally. You should have the impulse unit evaluated for replacement - perhaps the rebuilder you used may be able to provide one at a reasonable cost. If you have a small puller you can remove the impulse unit and have a look-see for yourself. If it is a loose/worn pin you might be able to get it repaired if you can't find a good one. Remove the impulse nut, and place a small 2-jaw puller (usually an OTC 1020 can be made to fit) under the impulse strike plate (not under the impulse shell). Tighten it up and strike the puller screw with a hammer and it should pop loose. Don't hit it too hard or you can damage the threaded end of the magnetic rotor. The whole unit will pull off the tapered shaft - don't loose the key - then carefully unwind the cup and spring and look at the parts.

[Log in to Reply]  [No Email]
greenmisterg

05-05-2008 13:42:18




Report to Moderator
 Re: Fairbanks RV2B in reply to Jerry Pevehouse, 05-05-2008 13:39:13  
Jerry..Have you asked the folks who repaired the mag what they think is wrong? I don't know anything about magnetos but that's where I'd start..



[Log in to Reply]  [No Email]
Jerry Pevehouse

05-05-2008 16:50:11




Report to Moderator
 Re: Fairbanks RV2B in reply to greenmisterg, 05-05-2008 13:42:18  
Fellow who has worked on the mag is in Tennessee. He is going through a divorce and not taking it well. I'm not the kind of guy to add insult to injury. If it cost me twice as much to pay someone else to re-do it. I'd rather do that than kick someone while they are down. Think this mag has the early 'solid looking" coupler. I do think you are right Duane, but hate to take it off and risk not being able to fix it and put it back on correctly. It's a shame, because the mag is really hot for a change.

[Log in to Reply]  [No Email]
Duane Larson

05-05-2008 17:07:50




Report to Moderator
 Re: Fairbanks RV2B in reply to Jerry Pevehouse, 05-05-2008 16:50:11  
Since some folks know I also live in Tennessee and rebuild magnetos, I just want to make it clear I was not the one who worked on your magneto.... I'm still happily married and this September will have been for 40 years.

The initial coupling was the YB, a welded unit which was replaced in 1936 by the XD unit, which had a machined hub rather than the pressed steel hub, and a different hub/pawl assembly. That was replaced sometime prior to 1948 by the UB3 coupling, a forged steel unit still used today. It may still be available, but the unit would be about $150 or so.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
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 ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

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.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy