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Old 10-11-2010, 06:17 PM   #1
nitro1956
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Member#: 230682
Join Date: Nov 2009
Default Piston Slap 02-94-05R

My 2003 Outback is great, except for piston slap.

.......anyone have experience with using 12006AC910/12006AC920 pistons to elminate piston slap ?
........anyone have Bulletin 02-94-05R which describe the use of these pistons for piston slap correction ?

.....Thanks
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Old 10-11-2010, 11:40 PM   #2
williaty
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Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Delaware County, Ohio
Vehicle:
2005 2.5RS Wagon
Regal Blue Pearl

Default

It's not that simple for you. I'm assuming you have a 03 Outback with the 2.5L NA motor, not the Outback Sport (part numbers for pistons are different between them).

Depending on which destination code your car is, the piston part numbers vary. However, for each destination code, there are Standard A, Standard B, Oversized 0.25mm, and Oversized 0.50mm pistons available. However, neither of the part numbers you list apply to your model year.

To do the repair properly, you'll need to split the block and examine the cylinder walls. Depending on how severely the slap has damaged the walls, you'll have to do a greater or lesser overbore to remove the damage. Once you have a rough guess of how much overbore you'll require, then you order either the OS.25 or OS.50 pistons correct for your car and destination code. Once the pistons arrive, you give the pistons and the block halves to a machine shop who will then bore and hone your block to match your pistons.
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Old 10-12-2010, 09:18 AM   #3
nitro1956
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Default

......I have the "regular" Outback SW, not the Outback Sport.

The 12006AC910/12006AC920 pistons I've been told are 0.06mm oversize.
....If these piston part numbers are not for my
2003 "regular" Outback SW, then what are the analogous piston part numbers for A and B 0.06mm oversize pistons for my wagon ??
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Old 10-12-2010, 05:39 PM   #4
williaty
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Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Delaware County, Ohio
Vehicle:
2005 2.5RS Wagon
Regal Blue Pearl

Default

12006AC080 for Standard B
12006AC090 for Oversized 0.25mm
12006AC100 for Oversized 0.50mm

Keep in mind you'll need to bore and hone the block with any of the oversized pistons.
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