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

Shop Now

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

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Case Tractors Discussion Forum
:

DC sparkplug - Which one?

Welcome Guest, Log in or Register
Author 
Joe C

10-21-2006 08:20:03




Report to Moderator

I have a '42 DC dual-fuel. Do I want autolite no.3116 with 18mm threads, or no.3076 with 7/8"-18 threads. What's the difference? How do I tell what I have. Can I cross-reference the old Champion number somewher? Any help is appreciated.




[Log in to Reply]   [No Email]
Joe C

10-22-2006 05:07:54




Report to Moderator
 Re: DC sparkplug - Which one? in reply to Joe C, 10-21-2006 08:20:03  
Thank you all!



[Log in to Reply]  [No Email]
Walt Davies

10-21-2006 23:13:39




Report to Moderator
 Re: DC sparkplug - Which one? in reply to Joe C, 10-21-2006 08:20:03  
If you have the Multifuel head and like my LA head it has the 7/8 plugs then you will have to use the 7/8 plugs as the 18 mm will fall right though the hole. I have heads for both sizes and there is quite a differance in them.
I use Champion D-21 in my LA with the LP head and they work great. I have tried lower heat ranges with poor results.
I'm not sure of the heat range for the Multifuel engine but any auto parts store can cross referance the ones that you have to any brand.
Walt PS get a hot plug these old engines run cool and need them. Just watch the plug colr when removed Black carboned up need a hotter plug light grey or clean just right brown burnt spots to hot. Covered with white stuff to much resistance.

[Log in to Reply]  [No Email]
johndeereman

10-21-2006 16:37:20




Report to Moderator
 Re: DC sparkplug - Which one? in reply to Joe C, 10-21-2006 08:20:03  
why not use the auto lites with a mag i use them in my deere and my dc havent had any trouble?



[Log in to Reply]  [No Email]
Glen in TX

10-21-2006 08:52:16




Report to Moderator
 Re: DC sparkplug - Which one? in reply to Joe C, 10-21-2006 08:20:03  
Champion W14, 7/8-18 thread = Autolite 3076

Champion D16, UD16, D18Y, D21, 18mm thread = Autolite 3116 or even a better plug the Denso L14U U groove electrode. Autolite 386 & 388, 18mm are resistor types and don't use those with a magneto.



[Log in to Reply]  [No Email]
Joe C

10-21-2006 21:07:36




Report to Moderator
 Re: DC sparkplug - Which one? in reply to Glen in TX, 10-21-2006 08:52:16  
Does a resistor plug with a mag dampen the spark? Would this make the tractor harder to start? I prefer Autolite plugs over Champion.



[Log in to Reply]  [No Email]
Glen in TX

10-21-2006 21:41:41




Report to Moderator
 Re: DC sparkplug - Which one? in reply to Joe C, 10-21-2006 21:07:36  
Magnetos were never designed for use with resistor type plugs and carbon type wires and should always use non resistor plugs and metallic core wires with them for longer life out of points, condenser, & coil. You may not notice much difference on a seldom used old tractor mag but on commercial engines with mags it will show in a shorter life out of the mag and manufacturer will not warranty coils if they know resistor plugs and wires were being used. Yes, you'll get a better cleaner hot blue spark with non resistor plugs and metallic wires with a magneto. Resistor type is fine for battery ignition too but that came along to dampen radio interference. Yeah Champions aren't what they use to be and I really like the Denso plugs now and push them over any brand including Autolite.

[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