Farm Equipment - Valve lapping

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Valve lapping

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=209005
Printed Date: 20 Nov 2025 at 10:15pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Valve lapping

Posted By: 3rd generation
Subject: Valve lapping
Date Posted: 20 Nov 2025 at 8:25pm

I’m sure this has been long discussed if lapping is needed. I just had hardened seats installed and valves ground. Personally I trust modern machining for a good seal. How many of you still lapped valves with hardened seats?

Replies:

Posted By: steve(ill)
Date Posted: 20 Nov 2025 at 9:24pm

always a good idea to get a finish lap.. if nothing else, to CONFIRM it is correct..

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Like them all, but love the "B"s.