Piston orientation 1 Attachment(s)
Can anyone tell me which way the split in the piston faces, I marked the cap but not the rod (fool).
They must have had an issue finding piston rings at the last rebuild, Have a close look. |
Re: Piston orientation Some, but not all, pistons are marked on the top which way is forward.
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Re: Piston orientation 1. Flat part up
2. Split toward cam |
Re: Piston orientation Thanks
No stamps on the top split to cam will hep Brendan |
Re: Piston orientation The split goes opposite to the thrust side.
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Re: Piston orientation I've seen that before where they run three rings on four groove pistons.
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Re: Piston orientation I count 11 piston rings
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Re: Piston orientation 1 Attachment(s)
If the pistons are supposed to have the split to the cam then they must have been in the wrong way round!
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Re: Piston orientation Quote:
I was driving to work one day and...KER-BLAM-tinkity-tink-tinkle! One piston disintegrated and it rained small crumbly bits as gravity sucked them into the bowels of the engine. Too fun. |
Re: Piston orientation They probably cut the ring grooves and added spacers to save the pistons.
In any case those pistons have been more than once around the block. |
Re: Piston orientation Quote:
Brendan |
Re: Piston orientation According to the service bulletins the split goes to the left side(left/right determined from drivers seat)
This makes the camshaft side the thrust side that has the solid skirt, |
Re: Piston orientation The direction of rotation sets the thrust side. When a connecting rod is going down on the power stroke in a clockwise rotating engine (as viewed from the front), the piston thrusts the opposite direction. In the case of the model A, the thrust side is toward the valve chamber. Split skirts are for piston expansion as they heat up but that spit is a weak point on the skirt so you don't want the split on the thrust side.
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Re: Piston orientation I recently took apart a motor at the museum and it had two pistons facing each way... guess they were doubling down that at least they would be half right!
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Re: Piston orientation For my smiths compresser I switched #2,3 because the thrust is on the upstroke for the 2 air compressing pistons
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