Welcome! Please use the navigational links on your left to explore our website.

Company Logo 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
  
John Deere Tractors Discussion Forum
:

Re: jd 4450 ac leak can not find

[Show Entire Topic]  

Welcome Guest, Log in or Register
Author  [Modern View]
JDEM

09-20-2019 18:36:48




Report to Moderator

I don't know what a "dry nitrogen test" is? Do you mean you are pressurizing the system?

I have all sorts of equipment for detecting AC leaks and sometimes none of them work.

I often find the one thing that often finds the problem when other more common tests do not? Hook an air-chuck to a charge-port. Pressurize to 150 lbs. and then just go over everything with a spray bottom of soap-water and look for bubbles.

What happens when you put a vacuum on it? Does it hold full vacuum for day with no loss?

I find that with some problem AC systems, no vacuum leak shows and not pressure leak shows when the system is working. But once you turn off the engine and let the low-side pressurize - sometimes that leak will show with dye but that is only at around 60 PSI. Thus why my test with 150 PSI from my air-compressor often finds the problem when other tests do not.

One other comment. When 134A first came into use, it was believed that the rubber AC hoses made for R12 would leak with the smaller molecules in the 134A. So since then, all new rubber hoses are "barrier" hoses with a special lining inside. Not sure if you have new hoses made for 134A or not. Now adays all new AC hose is "barrier" hose so the descriptive word is often not even used anymore.

[Log in to Reply]   [No Email]
cannonball

09-21-2019 04:44:23




Report to Moderator
 Re: jd 4450 ac leak can not find in reply to JDEM, 09-20-2019 18:36:48  
sometimes I pressure with propane



[Log in to Reply]  [No Email]
[Show Entire Topic]     [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). We have the parts you need to repair your tractor - the right parts. Our fast shipping, low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2019 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