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Rear Main Seal Retainer - Subaru (11831AA231)
WRX. Legacy/Outback.
Rear Main Seal Retainer - Subaru Parts Pro (11831AA231)
The Rear Main Seal Retainer - Subaru Parts Pro (11831AA231) is a genuine OEM engine sealing component designed to restore and maintain proper factory positioning, support, and retention of the rear main seal within its designated Subaru vehicle application. Manufactured to Subaru Parts Pro’s exact factory specifications, this retainer provides precise fitment, correct sealing alignment, and dependable integration with compatible engine blocks, crankshafts, rear main seals, fasteners, and surrounding powertrain components.
Constructed from durable automotive-grade cast or machined metal engineered for heat, oil, pressure, vibration, and dimensional stability, this Rear Main Seal Retainer is designed to withstand repeated engine heat cycles, crankshaft rotation, lubricant exposure, vehicle vibration, and demanding operating conditions. Its durable construction helps resist warping, cracking, corrosion, deformation, oil leakage, and premature deterioration while maintaining dependable long-term sealing support.
Functionally, the Rear Main Seal Retainer provides a factory-engineered mounting and support surface that helps hold the rear main seal in the correct position around the crankshaft. By maintaining proper seal alignment and support, it helps reduce the risk of engine oil leakage while preserving the sealing relationship established by the original Subaru engine design.
As a genuine Subaru Parts Pro OEM component, this retainer is manufactured to precise factory dimensions, crankshaft clearance, seal bore geometry, mounting-hole locations, mating-surface profile, fastener placement, alignment requirements, and sealing tolerances. Its application-specific engineering helps ensure correct interaction with surrounding OEM engine block and crankshaft components.
Installation requires positioning the retainer correctly at the rear of the engine and securing all applicable seals, gaskets, fasteners, and related hardware according to factory procedures. Related rear main seals, crankshaft sealing surfaces, engine block mating surfaces, gaskets, and fasteners should be inspected during replacement. Compatibility should be verified using OEM part number 11831AA231 before installation.
• Genuine Subaru Parts Pro OEM Rear Main Seal Retainer
• Designed specifically for its designated factory engine rear sealing application
• Helps maintain proper rear main seal positioning, support, alignment, and oil sealing performance
• Durable automotive-grade cast or machined metal construction provides dependable long-term structural and sealing support
• Engineered to withstand repeated engine heat cycles, crankshaft rotation, oil exposure, vehicle vibration, and demanding operating conditions
• Manufactured to precise factory dimensions, seal bore geometry, crankshaft clearance, mounting-hole locations, mating surfaces, and sealing tolerances
• Precision-engineered for factory fit and compatibility with surrounding OEM engine blocks, crankshafts, rear main seals, gaskets, fasteners, and powertrain components
Choosing the Rear Main Seal Retainer - Subaru Parts Pro (11831AA231) helps restore your Subaru’s rear engine sealing system to its intended factory configuration while delivering authentic OEM quality, precise fitment, dependable seal retention, durable construction, proper crankshaft sealing support, and the factory-engineered reliability expected from genuine Subaru Parts Pro components.
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Product Details
Description
WRX. Legacy/Outback.
Rear Main Seal Retainer - Subaru Parts Pro (11831AA231)
The Rear Main Seal Retainer - Subaru Parts Pro (11831AA231) is a genuine OEM engine sealing component designed to restore and maintain proper factory positioning, support, and retention of the rear main seal within its designated Subaru vehicle application. Manufactured to Subaru Parts Pro’s exact factory specifications, this retainer provides precise fitment, correct sealing alignment, and dependable integration with compatible engine blocks, crankshafts, rear main seals, fasteners, and surrounding powertrain components.
Constructed from durable automotive-grade cast or machined metal engineered for heat, oil, pressure, vibration, and dimensional stability, this Rear Main Seal Retainer is designed to withstand repeated engine heat cycles, crankshaft rotation, lubricant exposure, vehicle vibration, and demanding operating conditions. Its durable construction helps resist warping, cracking, corrosion, deformation, oil leakage, and premature deterioration while maintaining dependable long-term sealing support.
Functionally, the Rear Main Seal Retainer provides a factory-engineered mounting and support surface that helps hold the rear main seal in the correct position around the crankshaft. By maintaining proper seal alignment and support, it helps reduce the risk of engine oil leakage while preserving the sealing relationship established by the original Subaru engine design.
As a genuine Subaru Parts Pro OEM component, this retainer is manufactured to precise factory dimensions, crankshaft clearance, seal bore geometry, mounting-hole locations, mating-surface profile, fastener placement, alignment requirements, and sealing tolerances. Its application-specific engineering helps ensure correct interaction with surrounding OEM engine block and crankshaft components.
Installation requires positioning the retainer correctly at the rear of the engine and securing all applicable seals, gaskets, fasteners, and related hardware according to factory procedures. Related rear main seals, crankshaft sealing surfaces, engine block mating surfaces, gaskets, and fasteners should be inspected during replacement. Compatibility should be verified using OEM part number 11831AA231 before installation.
• Genuine Subaru Parts Pro OEM Rear Main Seal Retainer
• Designed specifically for its designated factory engine rear sealing application
• Helps maintain proper rear main seal positioning, support, alignment, and oil sealing performance
• Durable automotive-grade cast or machined metal construction provides dependable long-term structural and sealing support
• Engineered to withstand repeated engine heat cycles, crankshaft rotation, oil exposure, vehicle vibration, and demanding operating conditions
• Manufactured to precise factory dimensions, seal bore geometry, crankshaft clearance, mounting-hole locations, mating surfaces, and sealing tolerances
• Precision-engineered for factory fit and compatibility with surrounding OEM engine blocks, crankshafts, rear main seals, gaskets, fasteners, and powertrain components
Choosing the Rear Main Seal Retainer - Subaru Parts Pro (11831AA231) helps restore your Subaru’s rear engine sealing system to its intended factory configuration while delivering authentic OEM quality, precise fitment, dependable seal retention, durable construction, proper crankshaft sealing support, and the factory-engineered reliability expected from genuine Subaru Parts Pro components.
| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|---|---|---|---|
Shipping Policy
- In stock orders ship within 24 hours.
- Weekend orders will be processed the next business day.
- If a part is not in stock and must be ordered from the manufacturer, it usually takes 2-3 days to arrive to us and will be promptly shipped to you. Most of the orders are shipped complete within 2-3 business days. A few of the parts ordered from the manufacturer may take up to 5-6 business days to arrive and will shipped to you immediately.
- Depending upon location, ground shipments usually take 2-7 days.
- Your order may be shipped Overnight for an additional cost.
- Oversized shipments will be additional; you will be contacted prior to shipping for approval.
- We cannot guarantee transit times for ground and oversize orders.
- Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost to the customer.
- We do not ship internationally.
- In the unlikely event that a part has been placed on backorder or discontinued, we will do our best to try and find one for you as quickly as possible.
- We do not ship COD orders.
Return Policy
- Contact us to arrange for any returns.
- A copy of the invoice will need to be included with the return.
- Parts must be resaleable and in the original packaging.
- We cannot take back used parts.
- We cannot take back installed or tried parts.
- Electrical parts are not returnable.
- We do reserve the right to refuse and return any parts we find have been installed, are used or do not meet the above criteria.
- Return request need to be within 30 days of receipt.
Cancellation Policy
- An order or a portion of an order may be cancelled up until the time it is shipped and no longer in our possession.
Subaru
Genuine Subaru parts are built to the specifications Subaru engineers used on the production line, which matters more on these platforms than most. Symmetrical all-wheel drive requires matched components across both axles, and the boxer engine's horizontally opposed layout uses parts with no aftermarket equivalent in fit or material spec. Ordering OEM protects drivetrain longevity, factory warranty coverage, and resale value.
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We have a long-standing tradition of treating every customer with fairness, honesty, and respect. Our goal is to build lifelong relationships and become your trusted source for genuine Subaru parts—both in-store and online.