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426 injection pump
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TrentH View Drop Down
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Joined: 05 Mar 2025
Location: Minnesota
Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TrentH Quote  Post ReplyReply Direct Link To This Post Topic: 426 injection pump
    Posted: 19 Mar 2026 at 3:48pm
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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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22760 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 2026 at 3:53pm
1 1/8" I think.
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tbran View Drop Down
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Joined: 14 Sep 2009
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Points: 3631 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tbran Quote  Post ReplyReply Direct Link To This Post 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.  
When told "it's not the money,it's the principle", remember, it's always the money..
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Lynn Marshall View Drop Down
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Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2481 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lynn Marshall Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 2026 at 6:34pm
Not related to your problem, but I noticed this on an 8070.[IMG][/IMG]20260302_151404_2026-03-19_18-41-32.jpg20260302_151409.jpg20260302_151404_2026-03-19_18-41-32.jpg

Edited by Lynn Marshall - 19 Mar 2026 at 6:43pm
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8970 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 29 minutes ago at 11:30pm
I got one of those. Chinese knock off Bosch A pump. It's better than the m100 but not as good as the Bosch A on my other 8070. It was built locally by a guy who knew how to make one perform. Governor and torque matters. It has retard notches in the plunger for starting. I don't think the fake pump has that feature because of how it starts cold. 30-50 degrees. The M100 started better before I switched them.
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