 Piston Orientation Question, Piston Orientation |
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| Highland |
 Dec 4 2013, 09:36 PM
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#1
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Senior Member  Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California  |
I'm installing (reusing) stock Mahle dished 94mm pistons on a stock 2.0 engine and don't see any arrows on the piston crowns to point to the flywheel. I tried measuring the wrist pin offset with calipers to determine an offset and they measure the same on both sides.
I believe my machinest told me to have the block (circled in the picture) on the bottom of the piston toward the flywheel. Is that correct? If not, how do I determine the correct direction of installation.  |
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| Cap'n Krusty |
Dec 4 2013, 10:28 PM
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#2
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
If it's a Mahle piston, there's a mark. Might not be an arrow, but it was marked when it left the factory.
The Cap'n |
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| Highland |
Dec 4 2013, 11:23 PM
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#3
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Senior Member Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
Are any of these symbols indication of piston orientation?
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| McMark |
Dec 4 2013, 11:54 PM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
The box with a squiggley line is supposed to represent a crank and flywheel. The box goes toward the flywheel.
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| jcd914 |
Dec 5 2013, 12:05 AM
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#5
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
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| Highland |
Dec 5 2013, 10:13 AM
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#6
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Senior Member Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
Does anyone know what the markings on the other side are?
I know the 93... is piston diameter, but what are the rest? |
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