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426 engine
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allis3 View Drop Down
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Joined: 29 Jul 2012
Location: usa
Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote allis3 Quote  Post ReplyReply Direct Link To This Post Topic: 426 engine
    Posted: 06 Oct 2018 at 9:53pm
What 426 allis engines had the German crank in them . Found a coupe of 670T engines but not finding what cranks they had
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 19492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2018 at 10:54pm
What is your concern?? Any 670- T engine should have a non-counterbalanced crankshaft in them. That is assuming it's never been replaced with a different crankshaft. Any 1800 RPM gen-set engine has a cheap crankshaft in them because of the application. The best cranks had the small diameter long length bolt holding on the crank pulley. What size socket does the crank pulley bolt take ??
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allis3 View Drop Down
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Joined: 29 Jul 2012
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Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote allis3 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Oct 2018 at 7:12am
I don’t have them in my possession yet , was just checking to see if the cranks were the same as the N5. Both of these engines were stationary rigs. Gonna stroke one of them for a big cube class and convert it to gas
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Joined: 12 Sep 2009
Points: 19492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 07 Oct 2018 at 8:15am
They are not an N-5/6 crankshaft as I see it. If they have a fluid vibration damper they are the counterbalanced design. Never have seen a rubber damper on the N-5/6 crankshaft.
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Joined: 28 Feb 2013
Location: MN.
Points: 6475 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 07 Oct 2018 at 9:38am
Originally posted by DrAllis DrAllis wrote:


They are not an N-5/6 crankshaft as I see it. If they have a fluid vibration damper they are the counterbalanced design. Never have seen a rubber damper on the N-5/6 crankshaft.



Say Dr., will the fluid damper work on a non counterbalanced stroked crank??
It has been computer balanced.
2-8050 1-7080 6080 D-19 modelE & A 7040   R50       
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Joined: 12 Sep 2009
Points: 19492 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 07 Oct 2018 at 10:58am
It will work fine. I've had one on a 180 twin-spin puller for many years.
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allis3 View Drop Down
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Joined: 29 Jul 2012
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Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote allis3 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Oct 2018 at 11:08am
Anyone have any leads on a 426 head the plugs have been installed in already
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Joined: 25 Sep 2023
Location: Doral, Fl
Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ronin x Part Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2023 at 7:03pm
Can someone help me? I am looking for a standard size crankshaft for an Allis-Chalmers 670T motor. Can anyone recommend someone who might have it?
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