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
Classified Ads
Photo Ads
Tractor Parts

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

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

Research & Info
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

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

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Kountry Life
John Deere Tractors Discussion Forum

Replacing head gasket on 520

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

08-14-2019 04:48:49

Report to Moderator

In process of replacing head gasket. Is there a certain way the studs go into the block? One end of the stud is flat and the other is rounded. What is the purpose of the lead washers?

[Log in to Reply]   [No Email]

08-14-2019 14:13:29

Report to Moderator
 Re: Replacing head gasket on 520 in reply to drastic dave, 08-14-2019 04:48:49  
Flat end goes in the block. Those threads are rolled to larger pitch diameter to fit tighter than the nut end. You may need sealer if any are through hole into the water jacket.

[Log in to Reply]  [No Email]

08-14-2019 05:30:17

Report to Moderator
 Re: Replacing head gasket on 520 in reply to drastic dave, 08-14-2019 04:48:49  
No service manual ? Call 1-800-522-7448.

[Log in to Reply]  [No Email]

08-14-2019 05:14:37

Report to Moderator
 Re: Replacing head gasket on 520 in reply to drastic dave, 08-14-2019 04:48:49  
I would suspect that the "flat" end of the stud threads into the block. Is the thread length on that end of the stud a bit shorter? Also, the threads on the block end are designed for a closer fit than the standard thread on the nut end. Likely, that "fit" wears some over time with every removal and installation, but in theory when being installed correctly it will take more effort to screw them into the block vs. the other end (incorrect) end.

As to the lead washers, their purpose has been argued about on here for years.

The consensus seems to be that they provide a sort of "lube" to prevent the steel nuts from gouging into the cast iron head, making for a more smooth/accurate tightening/torquing of the nuts.

[Log in to Reply]  [No Email]
Mike M

08-14-2019 05:09:59

Report to Moderator
 Re: Replacing head gasket on 520 in reply to drastic dave, 08-14-2019 04:48:49  
The flat short end goes into the block. The threads are not cut as deep or tapered ? so as to help them tighten up in the hole before bottoming out. Lead washers will aid in sealing and lubricating the nuts despite all the people on here that will say otherwise. Be sure to use them just as the factory did. FWIW: Now on models like the 520,530,620,630 from what I have seen in the past If I had the head off of one that I had no history on I'd pull the pistons out too. I have seen several with broken top piston rings. One was so bad it worn a hole up to the top of the piston and a piece of ring was hammering against the cyl. head. At the very least I'd surly mic the cyl. bore to see how much wear it has.

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

Hop to:

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