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

Ford 9N, 2N & 8N Discussion Forum
:

Compression Testing Results

Welcome Guest, Log in or Register
Author 
Anvilheadtexas

01-07-2008 13:28:02




Report to Moderator

I have posted about my project 8N before. I have the tractor stripped down fairly well. I am taking it down because of a bad blow by and low compression problem on cylinder #1. I have monitored a lot of posts on this site regarding poor compression and I got to thinking that maybe I had a stuck valve. So I did another compression test yesterday. This time I had the valve covers off and I was able to watch the valves. I assume if the valves are "stuck" they would not move? Anyway, the valves looked like they moved up and down. The compression came back 95 plus on 2,3 and 4. Number 1 is still 60 psi? I am still a new comer - go easy....seeing that the valves went up and down can I conclude the compression problem is not a valve problem. Also, there is NO odd sounds (like rings scraping up against the cylinder wall). I ran out of time to do a wet compression test. Also, the manifold is off - does that affect the compression test?

[Log in to Reply]   [No Email]
teddy52food

01-07-2008 14:30:47




Report to Moderator
 Re: Compression Testing Results in reply to Anvilheadtexas, 01-07-2008 13:28:02  
Male an adapter so you can put air pressure in the spark plug hole. Listen and find out where it is leaking. If it goes to the crankcase it is the rings . If it is in the exaust or intake port it would be a valve. (Most likely) You may have to turn that piston to TDC put the tractor in high gear and lock the brakes.



[Log in to Reply]  [No Email]
Dell (WA)

01-07-2008 14:11:59




Report to Moderator
 Re: Compression Testing Results in reply to Anvilheadtexas, 01-07-2008 13:28:02  
Tex..... ..would it surprize you to learn that a BURNED EXHAUST valve will also cause LOW compression??? besides stuck valves. Burned valves are more common than stuck valves. Do a "wet" test on ALL cylinders so you have a valid comparison. Besides having stuck rings, you could also have a burned piston or broken rings. Manifold off'n or on should have NO effect on compression readings. Ford SPECS: 90psi min (dry)..... ....Dell

[Log in to Reply]  [No Email]
russbWA

01-07-2008 13:40:52




Report to Moderator
 Re: Compression Testing Results in reply to Anvilheadtexas, 01-07-2008 13:28:02  
I would give #1 cyl a soak in Marvel Mystery Oil, 3-6 ounces, through the plug hole for a few days, hoping the problem is just a stuck ring. Depending on your values (do unto all cylinders as one). But, I would just do the one.

Doing a compression test with out the manifold is fine. HTH



[Log in to Reply]  [No Email]
BillM (OH)

01-07-2008 14:01:37




Report to Moderator
 Re: Compression Testing Results in reply to russbWA, 01-07-2008 13:40:52  
Wet test on #1 should tell you whether it's valves or rings.



[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