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.

Discussion Forum
:

Compression Test

Welcome Guest, Log in or Register
Author 
Tom in Mich

09-04-2001 08:38:40




Report to Moderator

I have a 50 model B gas. When doing a cylinder compresion test, what should I expect the number to be? I did one this past weekend and the cylinder on the mag side read 65, the flywheel side read 50. This was performed as the manual said , clutch disengaged and the throttle opened slowly.




[Log in to Reply]   [No Email]
rollo

09-05-2001 05:18:28




Report to Moderator
 Re: Compression Test in reply to Tom in Mich, 09-04-2001 08:38:40  
John and Ralph are right. You have bad rings or valves. You can confirm the ring problem by squirting some motor oil in the cylinders and starting it up. If the compression is higher, the rings are bad.



[Log in to Reply]  [No Email]
John

09-04-2001 21:16:58




Report to Moderator
 Re: Compression Test in reply to Tom in Mich, 09-04-2001 08:38:40  
I'm only a 14 year old who is constently in the barn, but I would have to say you need a valve job done because it shuldn't have that much of a gap in th compression. We have a few tractors we build for pulling, and if you don't have the valves seating good, you loose a good power percentage.



[Log in to Reply]  [No Email]
Ralph

09-04-2001 19:57:07




Report to Moderator
 Re: Compression Test in reply to Tom in Mich, 09-04-2001 08:38:40  
Those values sound low! to me. I bought my first compression tester this spring, got 120 - 125 psig on the starting engine (820). Something less than 100 on my A. The latter needs an overhaul. The mechanic that helps me took the starting engine apart and ground the valves, new rings and honed the cylinders. Also replaced the crank which had a crack, probably due to oil cutoff due to incorrect installation of the rear main. The cranking engine was drooling a bit at the exhaust, but I swear, he can smell trouble on a Two Cylinder.

[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