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
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts
Salvage
Auction 

Community
Discussion Forums
Project Journals
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

  
Ford 9N, 2N & 8N Discussion Board

Re: Need advice re ring/crank bearing replacement


[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]

Posted by TheOldHokie on April 09, 2013 at 09:56:53 from (74.110.74.117):

In Reply to: Need advice re ring/crank bearing replacement posted by Bulldozer on April 09, 2013 at 08:23:26:

Always understood that most of the journal wear occurs at start up rather than at normal operating conditions.



That is normally the case since that is the transition from boundary to hydrostatic regime. Luging an engine alsl contributes to accelerated wear since increased load at lower RPM equates to a reduced oil film thickness and mixed mode lubrication.

Ok, so why does the flatheat N have the 0-50 psig oil pressure gauge and the OHV NAA have the 0-80 psig oil pressure gauge?

WAG - the engineers wanted a higher pumping pressure and increased flow rate to accomodate the greater demands of the OHV design. A flathead doesn't need top end lubrication but an OHV does and it needs it nearly immediately on startup. The oil pressure gauge on my 1963 Triumph equipped with a similar size and vintage Standard engine is 100 PSI and the Leyland specification is a minimum idle hot oil pressure of 30 PSI hot. With an OHV you have to move more oil, move it further, and get it there faster. An OHC is even more demanding in that regard.

So what is the concern about oil back pressure, since the oil pressure is not in the equation for oil film thickness?

It is a easily collected performance metric. The issues I just mentioned are part of that performance but pump oil pressure is also a very good indirect measure of bearing clearances. Bearing clearances ARE a factor in oil film thickness and a low pumping pressure indicates increased clearances and a reduction/loss of the protective oil film.

In my opinion the N series engine needs to have minimum of 15 psig oil pressure @ 1500 rpm.

A fresh engine with good oil clearances will easily make 40 PSI at 1500 RPM. I would say that an engine with 15 PSI @ 1500 RPM is telling you it has wide clearances and/or a worn oil pump and is nearing the end of it's service life. It's those widened clearances that will cause accelerated engine wear - not the low oil pressure.

TOH


Replies:




Add a Reply

:
:
: :

:

:

:

:

:

: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.


 
Advanced Posting Tools
  Upload Photo  Select Gallery Photo  Attach Serial # List 
Return to Post 

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


Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t ... [Read Article]

Latest Ad: Looking 4 set 9 bolt hubs 3 1/8 inch to fit 60 to 4010 jd [More Ads]

Copyright © 1997-2024 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