426 injection pump
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=210455
Printed Date: 19 Mar 2026 at 6:53pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 426 injection pump
Posted By: TrentH
Subject: 426 injection pump
Date Posted: 19 Mar 2026 at 3:48pm
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I have a combine motor in my 8050 that I used the stanadyne pump when I put it in. It started leaking fuel on the backside of the pump out of a large plug by the bottom towards the rear . Does anyone know what size wrench for the plug? I’m trying to avoid pulling it off to tighten it.
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Replies:
Posted By: DrAllis
Date Posted: 19 Mar 2026 at 3:53pm
Posted By: tbran
Date Posted: 19 Mar 2026 at 4:44pm
We made a special wrench - bent with correct angle and the surface has to be ground FLAT - the nut is so thin the taper on a std wrench will not turn the nut but just jump off. For some reason the bottom plug and back nut that retains the advance spring will 'let go' on rare occasions. Many times the threads pull - maybe you will be lucky.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: Lynn Marshall
Date Posted: 19 Mar 2026 at 6:34pm
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Not related to your problem, but I noticed this on an 8070.[IMG][/IMG] uploads/721/20260302_151404_2026-03-19_18-41-32.jpg" rel="nofollow - 20260302_151404_2026-03-19_18-41-32.jpg uploads/721/20260302_151409.jpg" rel="nofollow - 20260302_151409.jpg uploads/721/20260302_151404_2026-03-19_18-41-32.jpg" rel="nofollow - 20260302_151404_2026-03-19_18-41-32.jpg
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