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Allis B piston direction

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Andrew Z

01-18-2005 03:18:48

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I have rebuilt my B and the have a question with the pistons, and one of them was facing a diffrent direction. I have the I-T manual and it says that the "pin" side should face the cam. Does this mean the bolt that holds the wrist pin in place sould face the cam? The other pistions had a notch on the bottom of the piston, and this was facing foward, sould I go by this? Thanks for the help! Andrew

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Keith-OR

01-18-2005 15:59:37

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Re: Allis B piston direction in reply to Andrew Z , 01-18-2005 03:18:48

The I-T manual is correct, if you inspect the large end of the connecting rod( the end that attachs to the crankshaft) you will notice that there is a small pin hole on one side of the rod next to one of the bolts. This small hole ALWAYS faces the camshaft, as it squirts oil on the lobes of the cam while engine is running. Even V8s and 6 cylinders oil hole always faces cam!!!
HTH.... Keith

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Dick L Here Ya Go Keith

01-18-2005 19:16:30

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Re: Allis B piston direction in reply to Keith-OR, 01-18-2005 15:59:37

Below will be three pictures of the same rod. Looking from the piston out to the crankshaft end of the rod you will see that the wide side of the rod is on the left. Take note of the oil hole that oils the bearing when the pictured side is toward the cam.
third party image

This picture is of the same rod turned 180 degrees. Again looking at the large end of the rod you will notice that the wide part of the rod is to the right. Also take note of the oil hole that oils the rod bearings when this side faces the cam.

third party image

The third picture is looking down on the rod and shows both oil holes in the same rod.

third party image

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Andrew Z

01-19-2005 07:59:02

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Re: Allis B piston direction in reply to Dick L Here Ya Go Keith, 01-18-2005 19:16:30

Great pictures! Thanks for all the help!
Andrew

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Keith-OR

01-18-2005 21:17:37

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Re: Allis B piston direction in reply to Dick L Here Ya Go Keith, 01-18-2005 19:16:30

Thanks Dick. I guess I stand corrected. In all my years I have never seen this or just missed it when I rebuilt my 1948 C. Conrods where # and made sure pee hole was facing the cam. Just a habit with me to place pistons, push rods, valves, and lifters in the order that they were in the engine, so they go back where they come from. Just never paid much attention if there were pee hiles on both sides of the con rods. Will make sure I look the next time I have a B or C motor apart. Again thanks for the pictures and education. Great day learned something new.
Keith in Gods country

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Chris (OR)

01-18-2005 07:29:23

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Re: Allis B piston direction in reply to Andrew Z , 01-18-2005 03:18:48

It's been a year since I rebuilt one of those motors and Dick L may wade in here in an hour or two...

The piston kit that I got had marks on them for what direction they were supposed to face but I don't remember a difference in them that would really matter. If you look at the rods, you will see that the shaft intersects the bearing seat area a bit off to one side. Thus rods are not symetrical... Two face one way and two the other. If you don't do the rods that way, you will not get them centered on the crank journals... Don't quote me on this but I think that 1 & 4 are one way and 2 & 3 are the other....
Hope this helps...

Chris Horn
Scappoose Oregon

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Dick L

01-18-2005 07:56:36

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Re: Allis B piston direction in reply to Chris (OR), 01-18-2005 07:29:23

First off you just need to observe how the rod is made. The large end that fastens to the crankshaft is manufactured off center. The reason for this starts with Allis Chalmers packing every thing in as short of a block as possible. To have ample bearing surface on the mains, the rod journals on the crankshaft are not able to be in the center of the cylinder bore. Therefore it was necessary to offset the rod on the crankshaft.
On this engine it is not important which way the piston sits in the cylinder. It does matter which way the rod attaches to the crankshaft. Two of the rods go one way and the other two go the other way. It is easy to tell, slide a piston/rod assembly, without the rings installed, down the cylinder into place. It will (almost) only go one way. I have seen where the rod has been bolted on backwards, however the crankshaft will not turn a complete turn without binding. If you torque the rods you will surely damage the bearing.

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Andrew Z

01-18-2005 11:32:09

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Re: Allis B piston direction in reply to Dick L, 01-18-2005 07:56:36

Thanks guys for the help that made alot more sence than the I-T manual!
Andrew

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