Pulling Forum - The infamous 426

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The infamous 426

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=80518
Printed Date: 24 Nov 2024 at 5:54am
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Topic: The infamous 426

Posted By: MattLF9
Subject: The infamous 426
Date Posted: 19 Nov 2013 at 1:05pm

I'm sure you guys should know this. Is the 670l or any other 426 an interference or non-interference design? I have one that threw a rod and broke the camshaft and need to know this.

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A little CQB never hurt anybody.

Replies:

Posted By: wi50
Date Posted: 19 Nov 2013 at 3:36pm

interference, chances are you've got lots more valvetrain issues

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"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"

Posted By: DrAllis
Date Posted: 19 Nov 2013 at 3:40pm

I don't know of ANY diesel engine that could survive a broken camshaft and not have valves striking pistons somewhere.

Posted By: MattLF9
Date Posted: 19 Nov 2013 at 5:28pm

Oh boy...this is going to get expensive.

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A little CQB never hurt anybody.

Posted By: Unit3
Date Posted: 23 Nov 2013 at 9:57pm

7080's did. Dealer told of a customer that had a 7080that was starting to get a noise in it. With a half a day to plow, he finished and then they tore into it. He said the crank broke in such a way that everything still moved as if it was one piece. For how much longer is anyone guess.

Posted By: DrAllis
Date Posted: 24 Nov 2013 at 7:12am

Broken camshaft, not crankshaft.

Posted By: injpumpEd
Date Posted: 24 Nov 2013 at 10:02am

A friend of mine who pulls his 220(fellow member here)had the front of his cam snap off toward the end of a pull, stopped it cold! lol! He slid the old cam out, and slid another in, and never pulled the head off. It ran the same afterward. It did bend a bunch of pushrods, but since the valves are square to the pistons, it didn't seem to hurt any valves. The pushrods are supposed to be the weak link anyway. His original cam did not have the bolt for the gear, the one I sold him to put in it did. The good part is at least when it gets pulled apart, we'll know right where to put the valve reliefs for the bigger cam that'll go back in it. lol!

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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!