Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts

Community
Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
TractorLinks.com
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Kountry Life
  
Farmall & IHC Tractors Discussion Forum
Order Farmall Cub Parts Online

Cub engine compression

Welcome Guest, Log in or Register
Author  [Modern View]
Ben.So.Tex

11-07-2018 07:32:02




Report to Moderator

What should or is a good compression for a Farmall Cub?




[Log in to Reply]   [No Email]
jim48328

11-08-2018 08:09:19




Report to Moderator
 Re: Cub engine compression in reply to Ben.So.Tex, 11-07-2018 07:32:02  
Forgot to mention this before. Don't be too quick to blame a valve if it appears stuck.I have had several that appeared that way with all the normal checks. It turned out to be a STUCK lifter. They are splash lubricated and once in awhile when a motor sits awhile and a lifter is holding a valve open it may get some rust on the upper part of it and not go down like it should. Before I remove a head any more I pull the side cover behind the manifold and make sure that isn't the problem. I spray the lifters with PB blaster and make sure that both lifters on the bad cylinder are moving all the way up and down and not sticking. These motors don't have much spring pressure so it doesn't take much to make em stick. It's easier than pulling the head and finding out later. You'd have to pull that cover anyhow if you have to remove the valves. Good luck!

[Log in to Reply]  [No Email]
Jim48328

11-08-2018 05:25:08




Report to Moderator
 Re: Cub engine compression in reply to Ben.So.Tex, 11-07-2018 07:32:02  
factory manual says with flat top pistons 120 lbs. and that's all I ever ended up with on the dozen or two I've rebuilt.



[Log in to Reply]  [No Email]
gene bender

11-07-2018 15:13:10




Report to Moderator
 Re: Cub engine compression in reply to Ben.So.Tex, 11-07-2018 07:32:02  
because of errors that can be made its not how high the readings can be but the important reading is are all cycls close to each other you don't want a very weak one. Just watch the meter when turning engine over see how much is gained between first and second rpm and so forth. That is a small engine so don't expect great high readings it is a low compression engine even when new.



[Log in to Reply]  [No Email]
BarnyardEngineering

11-07-2018 08:09:24




Report to Moderator
 Re: Cub engine compression in reply to Ben.So.Tex, 11-07-2018 07:32:02  
That's more of an ideal, just-overhauled-and-seated-the-rings compression number.

Anything over 90 PSI is serviceable.



[Log in to Reply]  [No Email]
Janicholson

11-07-2018 07:41:05




Report to Moderator
 Re: Cub engine compression in reply to Ben.So.Tex, 11-07-2018 07:32:02  
With the throttle and choke wide open, charged battery for good rotation, and spark plugs out, 125 or more for a gasoline only, 20% less for distillate. If 2CC (teaspoon) of oil in each cylinder raises the compression 15 pounds/sq in, it probably needs rings. All readings require at least 5 solid compression strokes to get to max. Check the accuracy of the compression gauge as well. Jim



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

Hop to:


TRACTOR PARTS TRACTOR MANUALS
Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums


Copyright © 1997-2018 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