|
This is the modern view of the Yesterday's Tractors Forums. Just login with your YT Userid and password to post. If you have trouble logging in, contact us by email to support at ytmag.com, or through the Reader Form, and we will get you going right away.
| View previous topic :: View next topic |
| Author |
Message |
boler76
Regular
Joined: 07 Apr 2005
Posts: 275
Report to Moderator
|
 Posted: Mon Oct 08, 2012 12:37 pm Post subject: 8N piston and ring questions |
  |
|
The engine is a '49 8N, The bore measures 3.22" the pistons measure 3.2", I need a piston as a ring gland is missing and I need a full set of rings, What oversize piston do I need and what Oversize rings do I need to fit these pistons . 3/32" comp and 3/16" oil grooves. 4 ring pistons. Thanks for help.
|
|
| Back to top |
|
 |
R Geiger
Tractor Expert
Joined: 19 Apr 2009
Posts: 1772
Location: Banks, Oregon
Report to Moderator
|
| Posted: Mon Oct 08, 2012 2:03 pm Post subject: Re: 8N piston and ring questions |
|
|
| boler76 wrote: | | (quoted from post at 05:37:48 10/09/12) The engine is a '49 8N, The bore measures 3.22" the pistons measure 3.2", I need a piston as a ring gland is missing and I need a full set of rings, What oversize piston do I need and what Oversize rings do I need to fit these pistons . 3/32" comp and 3/16" oil grooves. 4 ring pistons. Thanks for help. |
I would put in a new sleeve, piston set and be done with it. Original bore was 3.100"
|
|
| Back to top |
|
|
1951 8N
Regular
Joined: 12 Jan 2008
Posts: 198
Report to Moderator
|
| Posted: Mon Oct 08, 2012 2:22 pm Post subject: Re: 8N piston and ring questions |
|
|
| R Geiger wrote: | | Original bore was 3.100" |
You mean 3.188".
|
|
| Back to top |
|
|
kossuth
Regular
Joined: 24 Dec 2007
Posts: 268
Report to Moderator
|
| Posted: Mon Oct 08, 2012 3:31 pm Post subject: Re: 8N piston and ring questions |
|
|
Last edited by kossuth on Mon Oct 08, 2012 3:33 pm; edited 2 times in total |
|
| Back to top |
|
|
boler76
Regular
Joined: 07 Apr 2005
Posts: 275
Report to Moderator
|
| Posted: Mon Oct 08, 2012 3:44 pm Post subject: Re: 8N piston and ring questions |
|
|
another question, due to fact that there are oversized pistons in the engine already, how does one tell if the block has been bored out and oversized sleeves already put in??
|
|
| Back to top |
|
|
R Geiger
Tractor Expert
Joined: 19 Apr 2009
Posts: 1772
Location: Banks, Oregon
Report to Moderator
|
| Posted: Mon Oct 08, 2012 6:03 pm Post subject: Re: 8N piston and ring questions |
|
|
| 1951 8N wrote: | (quoted from post at 07:22:48 10/09/12) | R Geiger wrote: | | Original bore was 3.100" |
You mean 3.188". |
That I did, have to proof read what I type.
|
|
| Back to top |
|
|
R Geiger
Tractor Expert
Joined: 19 Apr 2009
Posts: 1772
Location: Banks, Oregon
Report to Moderator
|
| Posted: Mon Oct 08, 2012 6:12 pm Post subject: Re: 8N piston and ring questions |
|
|
About the only way that I think would be reliable would be to pull the sleeve and measure the bore. assume you have cast thick sleeves and not the thin steel ones.
|
|
| Back to top |
|
|
teddy52food
Tractor Guru
Joined: 05 Mar 2006
Posts: 5137
Report to Moderator
|
| Posted: Mon Oct 08, 2012 6:22 pm Post subject: Re: 8N piston and ring questions |
|
|
Piston is .030 oversize. I don't think you will find those anymore. Pull the sleeves & do it right.
|
|
| Back to top |
|
|
1951 8N
Regular
Joined: 12 Jan 2008
Posts: 198
Report to Moderator
|
| Posted: Mon Oct 08, 2012 6:56 pm Post subject: Re: 8N piston and ring questions |
|
|
| R Geiger wrote: | | assume you have cast thick sleeves and not the thin steel ones. |
Why would you assume that? A 1949 8N would have had the .040 steel sleeves originally.
|
|
| Back to top |
|
|
boler76
Regular
Joined: 07 Apr 2005
Posts: 275
Report to Moderator
|
| Posted: Tue Oct 09, 2012 4:17 am Post subject: Re: 8N piston and ring questions |
|
|
more questions, from my search I find that the original OD of sleeve is 3.368 if they are original sleeves, they are cast, the measured ID is 3.22" does that leave me with .075" wall thickness, if so why would I change sleeves when I have .030" oversized pistons and this site sells them, Could I not just replace the one bad piston and use oversized rings again? I am not a mechanic, I am an old retired electrician, so need all the help I can get Thanks.
|
|
| Back to top |
|
|
Ken(Ark)
Long Time User
Joined: 17 Feb 2007
Posts: 1448
Report to Moderator
|
| Posted: Tue Oct 09, 2012 6:39 am Post subject: Re: 8N piston and ring questions |
|
|
| boler76 wrote: |
Could I not just replace the one bad piston and use oversized rings again? .
|
Yes , that would be an option .
I would want to weigh the new piston and balance them all to the lightest of the four . Digital scales are cheap these days .
If money is not too tight , I would go with the .0825 over pistons and have the old sleeves bored in place for a fresh tight fit .
Chances are the .030 pistons will be loose , at least 3 of them . if you could swing it for a set of 4 new .030 pistons you would know that they all weigh the same and will have about the same clearances .
Basic rule of thumb is to keep everything equal as in all loose or all tight etc , just depends on cash flow .
|
|
| Back to top |
|
|
R Geiger
Tractor Expert
Joined: 19 Apr 2009
Posts: 1772
Location: Banks, Oregon
Report to Moderator
|
| Posted: Tue Oct 09, 2012 9:50 am Post subject: Re: 8N piston and ring questions |
|
|
I assumed that because they appear to be bored oversize and don't think that would work with 040 steel sleeves, but then I have been wrong a few times.
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
|
|
Discount Prices for Parts! You can help support this extensive website by purchasing your tractor parts, manuals and merchandise from our [ Antique Tractor Store ] or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
|
YT Home
| Tractor Manuals
| Tractor Parts
| Forum Home
Copyright © 1997-2013 Yesterday's Tractor Co. - A Washington State Corporation
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
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
