How should piston ring end gaps, piston pin cir clips, and pistons be correctly installed on Subaru Forester?

Align the end gaps of the piston rings at a proper distance apart and replace the piston pin cir clips on the inner piston pin bore groove of each piston securely with the piston positioned in a way that the cir clip is placed in the groove with reference to the crankcase service hole. Wipe some of the fresh engine oil on the skirt and the rings and after that slide a piston ring compressor over the number one piston keeping the skirt about 1-inch sticking out to help you as you compress the rings as tight as possible. Slowly turn the crankshaft clockwise until the number one and two connecting rods are vertically aligned at B.D.C with the center of the cylinder. Move the number one piston into the cylinder very carefully with the markup on the crown of the piston facing forward in the engine, then apply a light impact with your hand on the side of the ring compressor where it is in contact with the crankcase. People should fit the wooden/plastic hammer handle on the piston and push the piston into the cylinder while keeping the ring compressor on to ensure the piston rings do not flop out. Should resistance be encountered while resuscitating a patient, stop and look for the cause apart from pushing the piston. Advance the piston in until the piston pin bore and the small end of the connecting rod is perfectly aligned with the service hole, by using fabricated alignment tool. Unscrew the piston pin and apply a thin film of clean engine oil on the piston pin followed by sliding it through the service hole to the piston and connecting rod, should there be resistance align the new pin. Next, because of the outer cir clip, a new one should be fitted in the piston pin bore groove carefully so that it should not be misplaced as it will lead to serious damage to the engine. Perform the same steps for the number two piston, and put the service hole plug gaskets with RTV sealant and tighten them. While cranking the engine with the crankshaft snout down, turn the crankshaft until the number three & four connecting rods are at BDC, and repeat the piston & pin installation for these pistons. Last of all, RTV sealant should be applied to the service hole plug and cover gaskets, and after that, the plug and cover screws must be tightened.

Genuine Subaru Forester Piston

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24 Pistons found

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Subaru Forester Piston Set Right Std A
Part Number: 12013AB650
$67.48 MSRP: $97.80
You Save: $30.32 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Piston Set-Right; Piston
- Manufacturer Note: STD GRADE"A"
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2018 Subaru Forester | 2.0XT Premium, 2.0XT Touring | 2.0L H4
View related parts
Subaru Forester Piston Set Right Std B
Part Number: 12013AB660
$67.48 MSRP: $97.80
You Save: $30.32 (31%)
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston
- Manufacturer Note: STD GRADE"B"
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2018 Subaru Forester | 2.0XT Premium, 2.0XT Touring | 2.0L H4
View related parts
Subaru Forester Piston Set RH
Part Number: 12013AB250
$79.27 MSRP: $114.88
You Save: $35.61 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston, Piston & Pin Assembly
- Manufacturer Note: STD GRADE"A"
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2010 Subaru Forester | Forester Sports, L.L.Bean, X, X Limited, XS | 2.5L H4, 2.5L H4 SOHC
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Subaru Forester Piston Set RH OS0.25
Part Number: 12013AB550
$65.35 MSRP: $94.72
You Save: $29.37 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston, Piston & Pin Assembly
- Manufacturer Note: OS0.25
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2016 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring | 2.5L H4
- 2011-2013 Subaru Forester | X, X Limited, X Premium | 2.5L H4 DOHC
View related parts
Subaru Forester Piston Set RH
Part Number: 12013AB260
$79.27 MSRP: $114.88
You Save: $35.61 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston, Piston & Pin Assembly
- Manufacturer Note: STD GRADE"B"
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2010 Subaru Forester | Forester Sports, L.L.Bean, X, X Limited, XS | 2.5L H4, 2.5L H4 SOHC
View related parts
Subaru Forester Piston Set RH
Part Number: 12013AB270
$79.27 MSRP: $114.88
You Save: $35.61 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston
- Manufacturer Note: OS 0.25
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2010 Subaru Forester | Forester Sports, L.L.Bean, X, X Limited, XS | 2.5L H4, 2.5L H4 SOHC
View related parts
Subaru Forester Piston Set RH
Part Number: 12013AB280
$79.27 MSRP: $114.88
You Save: $35.61 (31%)
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston
- Manufacturer Note: OS 0.50
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2010 Subaru Forester | Forester Sports, L.L.Bean, X, X Limited, XS | 2.5L H4, 2.5L H4 SOHC
View related parts
Subaru Forester Piston Set Right OS0.50
Part Number: 12013AB680
$67.48 MSRP: $97.80
You Save: $30.32 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston
- Manufacturer Note: OS0.50
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2018 Subaru Forester | 2.0XT Premium, 2.0XT Touring | 2.0L H4
View related parts
Subaru Forester Piston Set Os 0.25
Part Number: 12006AE530
$82.95 MSRP: $120.22
You Save: $37.27 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Manufacturer Note: OS,0.25
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2021 Subaru Forester | Base, Limited, Premium, Sport, Touring
View related parts
Subaru Forester Piston Set Std B
Part Number: 12006AE520
$82.95 MSRP: $120.22
You Save: $37.27 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Manufacturer Note: STD GRADE"B"
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2021 Subaru Forester | Base, Limited, Premium, Sport, Touring
View related parts
Subaru Forester Piston Set Std A
Part Number: 12006AE510
$82.95 MSRP: $120.22
You Save: $37.27 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Manufacturer Note: STD GRADE"A"
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2021 Subaru Forester | Base, Limited, Premium, Sport, Touring
View related parts
Subaru Forester Piston Set Right OS0.25
Part Number: 12013AB670
$67.48 MSRP: $97.80
You Save: $30.32 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston
- Manufacturer Note: OS0.25
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2014-2018 Subaru Forester | 2.0XT Premium, 2.0XT Touring | 2.0L H4
View related parts
Subaru Forester Piston Set Os 0.50
Part Number: 12006AE540
$82.95 MSRP: $120.22
You Save: $37.27 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Manufacturer Note: OS,0.50
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2019-2021 Subaru Forester | Base, Limited, Premium, Sport, Touring
View related parts
Subaru Forester PISTON SET OS 0.50
Part Number: 12006AE660
$87.07 MSRP: $126.18
You Save: $39.11 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2025 Subaru Forester | 4 Cyl 2.5L, 4 Cyl 2.5L Hybrid
View related parts
Subaru Forester PISTON SET OS 0.25
Part Number: 12006AE650
$87.07 MSRP: $126.18
You Save: $39.11 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2025 Subaru Forester | 4 Cyl 2.5L, 4 Cyl 2.5L Hybrid
View related parts
Subaru Forester PISTON SET STD A
Part Number: 12006AE630
$87.07 MSRP: $126.18
You Save: $39.11 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2025 Subaru Forester | 4 Cyl 2.5L, 4 Cyl 2.5L Hybrid
View related parts
Subaru Forester PISTON SET STD B
Part Number: 12006AE640
$87.07 MSRP: $126.18
You Save: $39.11 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2025 Subaru Forester | 4 Cyl 2.5L, 4 Cyl 2.5L Hybrid
View related parts
Subaru Forester Piston Set RH Std B
Part Number: 12013AB540
$65.35 MSRP: $94.72
You Save: $29.37 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston, Piston & Pin Assembly
- Manufacturer Note: STD GRADE"B"
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2016 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring | 2.5L H4
- 2011-2013 Subaru Forester | X, X Limited, X Premium | 2.5L H4 DOHC
View related parts
Subaru Forester Piston Set RH OS0.50
Part Number: 12013AB560
$65.35 MSRP: $94.72
You Save: $29.37 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Set-Right; Piston, Piston & Pin Assembly
- Manufacturer Note: OS0.50
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2016 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring | 2.5L H4
- 2011-2013 Subaru Forester | X, X Limited, X Premium | 2.5L H4 DOHC
View related parts
Subaru Forester Piston Set RH Std A
Part Number: 12013AB530
$65.35 MSRP: $94.72
You Save: $29.37 (32%)
Product Specifications
- Other Name: Piston Set-Right; Piston, Piston & Pin Assembly
- Manufacturer Note: STD GRADE"A"
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2016 Subaru Forester | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring | 2.5L H4
- 2011-2013 Subaru Forester | X, X Limited, X Premium | 2.5L H4 DOHC

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1-20 of 24 Results

Subaru Forester Piston

The Subaru Forester's Piston converts the fiery blast of fuel ignition into the motion that drives the SUV down the road. Inside the cylinder, the Piston slides up and down, pushing on the crankshaft to convert the gases' expansion into rotational energy. Its rings seal tight to keep the pressure high and the oil out. The Piston crown, which prevents hotspots, is also bathed in jets of cooling oil. The component is made of a lightweight aluminum alloy which helps it bear heat and stress. Some of Subaru's performance editions use forged versions for extra strength without adding weight. Over the years, the great majority of Forester engines have applied a trunk-style Piston; that is, one which supports side forces and has its oil rings positioned below the wrist pin for reliable lubrication, and yet fits the relatively short stroke of the boxer. The trims designed for high-rev operation make use of slipper-type Piston versions that remove excess weight for faster responsiveness along with better balance. While crosshead and deflector designs are generally advantageous for large diesels and two-stroke units, they are notably absent from the Subaru, allowing the familiar Forester boxer engine to keep weight low and reliability high. In all, it is still the rugged heart of each firing chamber.

Our website stands as the go-to online destination for OEM Subaru Forester Piston. With complete lines of genuine Subaru Forester Piston available at unbeatable market prices, we ensure top quality, reliability, and durability. Each part comes backed by the manufacturer's warranty, reinforcing your trust in our offerings.

Subaru Forester Piston Parts Questions & Experts Answers

Piston Set RH
12013AB250
Q:
How should piston ring end gaps, piston pin cir clips, and pistons be correctly installed on Subaru Forester?
Posted by Andy C.
A:
Align the end gaps of the piston rings at a proper distance apart and replace the piston pin cir clips on the inner piston pin bore groove of each piston securely with the piston positioned in a way that the cir clip is placed in the groove with reference to the crankcase service hole. Wipe some of the fresh engine oil on the skirt and the rings and after that slide a piston ring compressor over the number one piston keeping the skirt about 1-inch sticking out to help you as you compress the rings as tight as possible. Slowly turn the Crankshaft clockwise until the number one and two connecting rods are vertically aligned at B.D.C with the center of the cylinder. Move the number one piston into the cylinder very carefully with the markup on the crown of the piston facing forward in the engine, then apply a light impact with your hand on the side of the ring compressor where it is in contact with the crankcase. People should fit the wooden/plastic hammer handle on the piston and push the piston into the cylinder while keeping the ring compressor on to ensure the piston rings do not flop out. Should resistance be encountered while resuscitating a patient, stop and look for the cause apart from pushing the piston. Advance the piston in until the piston pin bore and the small end of the connecting rod is perfectly aligned with the service hole, by using fabricated alignment tool. Unscrew the piston pin and apply a thin film of clean engine oil on the piston pin followed by sliding it through the service hole to the piston and connecting rod, should there be resistance align the new pin. Next, because of the outer cir clip, a new one should be fitted in the piston pin bore groove carefully so that it should not be misplaced as it will lead to serious damage to the engine. Perform the same steps for the number two piston, and put the service hole plug gaskets with RTV sealant and tighten them. While cranking the engine with the crankshaft snout down, turn the crankshaft until the number three & four connecting rods are at BDC, and repeat the piston & pin installation for these pistons. Last of all, RTV sealant should be applied to the service hole plug and cover gaskets, and after that, the plug and cover screws must be tightened.
Answered by Subaru Parts Specialist William / Dec 27, 2023