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08-10-2020, 01:47 AM | #1 |
Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 95
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Piston orientation
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. |
08-10-2020, 02:00 AM | #2 |
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Join Date: May 2010
Location: Victoria, Australia
Posts: 1,176
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Re: Piston orientation
Some, but not all, pistons are marked on the top which way is forward.
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08-10-2020, 02:24 AM | #3 |
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Join Date: May 2010
Location: Anaheim California
Posts: 551
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Re: Piston orientation
1. Flat part up
2. Split toward cam |
08-10-2020, 04:15 AM | #4 |
Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 95
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Re: Piston orientation
Thanks
No stamps on the top split to cam will hep Brendan |
08-10-2020, 10:15 AM | #5 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
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Re: Piston orientation
The split goes opposite to the thrust side.
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If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! |
08-10-2020, 11:06 AM | #6 |
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Location: So Cal
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Re: Piston orientation
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08-10-2020, 06:29 PM | #7 |
Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 95
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Re: Piston orientation
I count 11 piston rings
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08-10-2020, 08:40 PM | #8 |
Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 95
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Re: Piston orientation
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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08-10-2020, 11:54 PM | #9 | |
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Join Date: Mar 2017
Location: southern California
Posts: 725
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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. |
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08-11-2020, 01:33 AM | #10 |
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Join Date: Nov 2011
Location: Sonoma, CA.
Posts: 1,495
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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. |
08-11-2020, 01:57 AM | #11 |
Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 95
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Re: Piston orientation
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08-12-2020, 08:18 AM | #12 |
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Join Date: May 2010
Location: on the Littlefield
Posts: 6,159
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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, |
08-12-2020, 09:01 AM | #13 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,431
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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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08-12-2020, 10:45 AM | #14 |
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Join Date: Jun 2013
Location: Western Springs, IL
Posts: 324
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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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08-12-2020, 02:37 PM | #15 |
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Join Date: May 2010
Location: on the Littlefield
Posts: 6,159
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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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