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Product Details
The Genuine Honda OEM Rear Main Crankshaft Oil Seal (91214-RNB-A01) is a factory replacement seal designed to prevent engine oil from leaking around the rear of the crankshaft where the engine connects to the transmission. Manufactured to Honda's original equipment specifications, this precision-engineered seal provides dependable oil containment, proper fitment, and long-lasting performance for compatible Honda and Acura engines.
The rear main seal plays an essential role in maintaining engine reliability by keeping engine oil inside the crankcase while allowing the crankshaft to rotate freely. Over time, exposure to engine heat, oil, and continuous crankshaft movement can cause the original seal to harden, wear, or develop leaks. A failing rear main seal can allow oil to enter the transmission bellhousing, potentially contaminating the clutch and flywheel.
Whether you're rebuilding a K-Series engine, performing a clutch replacement, installing an upgraded flywheel, or addressing an existing oil leak, replacing the rear main seal with a genuine Honda component is an excellent preventative maintenance measure. This OEM seal offers factory-quality construction and precise dimensions to help maintain a reliable, leak-free engine.
Features
- Genuine Honda OEM Quality: Manufactured to Honda's original equipment standards for consistent fitment and reliable sealing performance.
- Precision 80x98x10mm Dimensions: Designed to provide an accurate fit within compatible rear crankshaft seal housings.
- Reliable Oil Sealing: Helps prevent engine oil from escaping around the rear crankshaft opening.
- Durable Construction: Engineered to withstand normal engine operating temperatures, oil exposure, and continuous crankshaft rotation.
- Direct OEM Replacement: Replaces the factory-installed rear main crankshaft oil seal on compatible applications.
- Protects Drivetrain Components: Helps prevent engine oil from contaminating the flywheel, clutch assembly, and transmission bellhousing.
- Ideal for Engine Rebuilds: Recommended when rebuilding K-Series engines or performing major engine maintenance.
- Perfect for Clutch and Flywheel Upgrades: Convenient replacement while the transmission and flywheel are removed.
- Performance Build Compatible: Suitable for naturally aspirated, turbocharged, and supercharged engine builds when the specified seal dimensions and application match.
- Factory Reliability: Maintains the original sealing design without requiring aftermarket modifications.
Additional Information
- Manufacturer: Honda
- Brand: Genuine Honda OEM
- Part Number: 91214-RNB-A01
- Product Type: Rear Main Crankshaft Oil Seal
- Alternative Names: Rear Main Seal, Rear Crankshaft Seal, Crankshaft Rear Oil Seal
- Installation Location: Rear of Engine / Crankshaft
- Inner Diameter: 80mm
- Outer Diameter: 98mm
- Thickness: 10mm
- Replacement Type: Direct OEM Replacement
- Quantity: 1
- Condition New
- OEM Part Number: 91214-RNB-A01
Common Reasons for Replacement
The rear main crankshaft oil seal is subjected to continuous engine operation, temperature changes, and oil exposure. Over time, the sealing material can deteriorate, allowing oil to leak from the rear of the engine.
- Oil Leaks Between Engine and Transmission: Visible oil accumulation near the transmission bellhousing may indicate a leaking rear main seal.
- Worn or Hardened Seal Material: Age and repeated heat cycles can cause the original sealing lip to lose flexibility.
- Oil Contamination on Clutch Components: A leaking rear main seal may allow oil to reach the flywheel or clutch assembly.
- High-Mileage Engine Maintenance: Replacing an aging seal during major drivetrain service can help prevent future leaks.
- Engine Rebuilding: A new rear main seal is recommended during complete engine disassembly and reassembly.
- Clutch Replacement: With the transmission and flywheel removed, replacing the seal can help avoid additional labor later.
- Flywheel Upgrades: An excellent opportunity to inspect and replace the rear main seal while installing a lightweight or performance flywheel.
- Crankshaft or Engine Service: Replacement may be necessary when servicing the crankshaft or related engine components.
- Important: Oil leaks near the transmission can also originate from other engine components. Confirm the source of the leak before replacing the rear main seal.
Installation Notes
- Remove the Transmission: Accessing the rear main crankshaft seal generally requires removing the transmission and associated drivetrain components.
- Remove the Flywheel or Flexplate: Carefully remove the flywheel or flexplate to expose the rear main seal and surrounding crankshaft area.
- Inspect the Existing Seal: Examine the original seal and surrounding engine surfaces for oil leakage, wear, or damage.
- Remove the Old Seal Carefully: Use an appropriate seal removal tool to extract the existing seal without scratching the crankshaft or damaging the seal housing.
- Inspect the Crankshaft Sealing Surface: Check for grooves, scratches, corrosion, or excessive wear that could prevent the new seal from sealing properly.
- Clean the Installation Area: Remove old oil residue, dirt, and debris from the seal housing before installing the replacement seal.
- Prepare the New Seal: Follow the applicable Honda factory service manual regarding lubrication, seal orientation, and installation requirements. Some seal designs require specific preparation procedures.
- Install the New Rear Main Seal: Use an appropriate seal installation tool to press the seal evenly into the housing at the factory-specified installation depth. Avoid twisting, folding, or damaging the sealing lip.
- Verify Proper Installation: Confirm the seal is seated squarely and that the crankshaft sealing surface and seal lip are correctly positioned.
- Reassemble the Drivetrain: Reinstall the flywheel or flexplate and transmission, following Honda's specified torque procedures and hardware replacement requirements.
- Check for Leaks: After reassembly, operate the engine and inspect for signs of oil leakage.
- Installation Recommendation: Because rear main seal replacement typically requires significant drivetrain disassembly, professional installation is recommended for those unfamiliar with engine and transmission service.
What's Included
- (1) Genuine Honda OEM Rear Main Crankshaft Oil Seal – 91214-RNB-A01
Please Note:
- Flywheel bolts, clutch components, transmission hardware, installation tools, and additional seals or gaskets are sold separately.
Keep your Honda or Acura engine properly sealed with the Genuine Honda OEM Rear Main Crankshaft Oil Seal (91214-RNB-A01). Designed to deliver precise factory fitment, dependable oil containment, and long-lasting performance, this OEM replacement seal is an excellent choice for engine rebuilds, clutch replacements, flywheel upgrades, and routine drivetrain maintenance. Whether you're restoring a daily driver or assembling a high-performance K-Series engine, choosing genuine Honda components helps ensure the reliability and quality your build deserves.
| Part Number: | 91214-RNB-A01 |
| Brand: | Honda |
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
Vehicle Fitment
| Year | Make | Model | Trim |
|---|---|---|---|
| 1986 | Acura | Legend | Base |
| 1987 | Acura | Legend | Base |
| 1987 | Acura | Legend | L |
| 1987 | Acura | Legend | LS |
| 1988 | Acura | Legend | Base |
| 1988 | Acura | Legend | L |
| 1988 | Acura | Legend | LS |
| 1989 | Acura | Legend | Base |
| 1989 | Acura | Legend | L |
| 1989 | Acura | Legend | LS |
| 1990 | Acura | Legend | Base |
| 1990 | Acura | Legend | L |
| 1990 | Acura | Legend | LS |
| 1991 | Acura | Legend | Base |
| 1991 | Acura | Legend | L |
| 1991 | Acura | Legend | LS |
| 1991 | Acura | NSX | Base |
| 1992 | Acura | Legend | Base |
| 1992 | Acura | Legend | L |
| 1992 | Acura | Legend | LS |
| 1992 | Acura | NSX | Base |
| 1993 | Acura | Legend | Base |
| 1993 | Acura | Legend | L |
| 1993 | Acura | Legend | LS |
| 1993 | Acura | NSX | Base |
| 1994 | Acura | Legend | GS |
| 1994 | Acura | Legend | L |
| 1994 | Acura | Legend | LS |
| 1994 | Acura | NSX | Base |
| 1995 | Acura | Legend | GS |
| 1995 | Acura | Legend | L |
| 1995 | Acura | Legend | LS |
| 1995 | Acura | Legend | SE |
| 1995 | Acura | NSX | Base |
| 1995 | Acura | NSX | T |
| 1995 | Honda | Accord | EX |
| 1995 | Honda | Accord | LX |
| 1996 | Acura | NSX | Base |
| 1996 | Acura | NSX | T |
| 1996 | Acura | RL | Base |
| 1996 | Acura | RL | Premium |
| 1996 | Honda | Accord | EX |
| 1996 | Honda | Accord | LX |
| 1997 | Acura | NSX | Base |
| 1997 | Acura | NSX | T |
| 1997 | Acura | RL | Base |
| 1997 | Acura | RL | Premium |
| 1997 | Honda | Accord | EX |
| 1997 | Honda | Accord | LX |
| 1998 | Acura | NSX | Base |
| 1998 | Acura | NSX | T |
| 1998 | Acura | RL | Base |
| 1998 | Acura | RL | Premium |
| 1998 | Acura | RL | SE |
| 1999 | Acura | NSX | Alex Zanardi Edition |
| 1999 | Acura | NSX | Base |
| 1999 | Acura | NSX | T |
| 1999 | Acura | RL | Premium |
| 2000 | Acura | NSX | Base |
| 2000 | Acura | NSX | T |
| 2000 | Acura | RL | Premium |
| 2001 | Acura | NSX | Base |
| 2001 | Acura | NSX | T |
| 2001 | Acura | RL | Premium |
| 2002 | Acura | NSX | T |
| 2002 | Acura | RL | Premium |
| 2002 | Acura | RSX | Base |
| 2002 | Acura | RSX | Type-S |
| 2002 | Honda | Civic | Si |
| 2003 | Acura | NSX | T |
| 2003 | Acura | RL | Premium |
| 2003 | Acura | RSX | Base |
| 2003 | Acura | RSX | Type-S |
| 2003 | Honda | Accord | DX |
| 2003 | Honda | Accord | EX |
| 2003 | Honda | Accord | LX |
| 2003 | Honda | Civic | Si |
| 2003 | Honda | Element | DX |
| 2003 | Honda | Element | EX |
| 2004 | Acura | NSX | Base |
| 2004 | Acura | RL | Premium |
| 2004 | Acura | RSX | Base |
| 2004 | Acura | RSX | Type-S |
| 2004 | Acura | TSX | Base |
| 2004 | Honda | Accord | DX |
| 2004 | Honda | Accord | EX |
| 2004 | Honda | Accord | LX |
| 2004 | Honda | Civic | Si |
| 2004 | Honda | Element | DX |
| 2004 | Honda | Element | EX |
| 2004 | Honda | Element | LX |
| 2005 | Acura | NSX | Base |
| 2005 | Acura | RSX | Base |
| 2005 | Acura | RSX | Type-S |
| 2005 | Acura | TSX | Base |
| 2005 | Honda | Accord | DX |
| 2005 | Honda | Accord | EX |
| 2005 | Honda | Accord | LX |
| 2005 | Honda | Accord | SE |
| 2005 | Honda | Civic | Si |
| 2005 | Honda | Element | EX |
| 2005 | Honda | Element | LX |
| 2006 | Acura | RSX | Base |
| 2006 | Acura | RSX | Type-S |
| 2006 | Acura | TSX | Base |
| 2006 | Honda | Accord | EX |
| 2006 | Honda | Accord | LX |
| 2006 | Honda | Accord | LX Special Edition |
| 2006 | Honda | Accord | Value Package |
| 2006 | Honda | Civic | DX |
| 2006 | Honda | Civic | EX |
| 2006 | Honda | Civic | GX |
| 2006 | Honda | Civic | LX |
| 2006 | Honda | Civic | Si |
| 2006 | Honda | Element | EX |
| 2006 | Honda | Element | LX |
| 2007 | Acura | TSX | Base |
| 2007 | Honda | Accord | EX-L |
| 2007 | Honda | Accord | Special Edition |
| 2007 | Honda | Accord | Value Package |
| 2007 | Honda | Civic | DX |
| 2007 | Honda | Civic | EX |
| 2007 | Honda | Civic | GX |
| 2007 | Honda | Civic | LX |
| 2007 | Honda | Civic | Si |
| 2007 | Honda | Element | EX |
| 2007 | Honda | Element | LX |
| 2007 | Honda | Element | SC |
| 2007 | Honda | Fit | Base |
| 2007 | Honda | Fit | Sport |
| 2008 | Acura | TSX | Base |
| 2008 | Honda | Civic | DX |
| 2008 | Honda | Civic | EX |
| 2008 | Honda | Civic | GX |
| 2008 | Honda | Civic | LX |
| 2008 | Honda | Element | EX |
| 2008 | Honda | Element | LX |
| 2008 | Honda | Element | SC |
| 2008 | Honda | Fit | Base |
| 2008 | Honda | Fit | Sport |
| 2009 | Honda | Civic | DX |
| 2009 | Honda | Civic | EX |
| 2009 | Honda | Civic | EX-L |
| 2009 | Honda | Civic | GX |
| 2009 | Honda | Civic | LX |
| 2009 | Honda | Civic | LX-S |
| 2009 | Honda | Element | EX |
| 2009 | Honda | Element | LX |
| 2009 | Honda | Element | SC |
| 2009 | Honda | Fit | Base |
| 2009 | Honda | Fit | Sport |
| 2010 | Honda | Civic | DX |
| 2010 | Honda | Civic | EX |
| 2010 | Honda | Civic | EX-L |
| 2010 | Honda | Civic | GX |
| 2010 | Honda | Civic | LX |
| 2010 | Honda | Civic | LX-S |
| 2010 | Honda | Element | EX |
| 2010 | Honda | Element | LX |
| 2010 | Honda | Element | SC |
| 2010 | Honda | Fit | Base |
| 2010 | Honda | Fit | Sport |
| 2010 | Honda | Insight | EX |
| 2010 | Honda | Insight | LX |
| 2011 | Honda | CR-Z | Base |
| 2011 | Honda | CR-Z | EX |
| 2011 | Honda | Civic | DX |
| 2011 | Honda | Civic | EX |
| 2011 | Honda | Civic | EX-L |
| 2011 | Honda | Civic | GX |
| 2011 | Honda | Civic | LX |
| 2011 | Honda | Civic | LX-S |
| 2011 | Honda | Element | EX |
| 2011 | Honda | Element | LX |
| 2011 | Honda | Fit | Base |
| 2011 | Honda | Fit | Sport |
| 2011 | Honda | Insight | Base |
| 2011 | Honda | Insight | EX |
| 2011 | Honda | Insight | LX |
| 2012 | Honda | Civic | DX |
| 2012 | Honda | Civic | EX |
| 2012 | Honda | Civic | EX-L |
| 2012 | Honda | Civic | GX |
| 2012 | Honda | Civic | HF |
| 2012 | Honda | Civic | LX |
| 2012 | Honda | Fit | Base |
| 2012 | Honda | Fit | Sport |
| 2013 | Acura | ILX | Base |
| 2013 | Honda | Civic | EX |
| 2013 | Honda | Civic | EX-L |
| 2013 | Honda | Civic | HF |
| 2013 | Honda | Civic | LX |
| 2013 | Honda | Civic | Natural Gas |
| 2013 | Honda | Fit | Base |
| 2013 | Honda | Fit | Sport |
| 2014 | Acura | ILX | Base |
| 2014 | Honda | Civic | EX |
| 2014 | Honda | Civic | EX-L |
| 2014 | Honda | Civic | HF |
| 2014 | Honda | Civic | LX |
| 2014 | Honda | Civic | Natural Gas |
| 2015 | Acura | ILX | Base |
| 2015 | Honda | Civic | EX |
| 2015 | Honda | Civic | EX-L |
| 2015 | Honda | Civic | HF |
| 2015 | Honda | Civic | LX |
| 2015 | Honda | Civic | Natural Gas |
| 2015 | Honda | Civic | SE |
| 2016 | Honda | HR-V | EX |
| 2016 | Honda | HR-V | EX-L |
| 2016 | Honda | HR-V | LX |
| 2017 | Honda | HR-V | EX |
| 2017 | Honda | HR-V | EX-L |
| 2017 | Honda | HR-V | LX |
| 2018 | Honda | HR-V | EX |
| 2018 | Honda | HR-V | EX-L |
| 2018 | Honda | HR-V | LX |
| 2019 | Honda | HR-V | EX |
| 2019 | Honda | HR-V | EX-L |
| 2019 | Honda | HR-V | LX |
| 2019 | Honda | HR-V | Sport |
| 2019 | Honda | HR-V | Touring |
| 2020 | Honda | HR-V | EX |
| 2020 | Honda | HR-V | EX-L |
| 2020 | Honda | HR-V | LX |
| 2020 | Honda | HR-V | Sport |
| 2020 | Honda | HR-V | Touring |
| 2021 | Honda | HR-V | EX |
| 2021 | Honda | HR-V | EX-L |
| 2021 | Honda | HR-V | LX |
| 2021 | Honda | HR-V | Sport |
| 2022 | Honda | HR-V | EX |
| 2022 | Honda | HR-V | EX-L |
| 2022 | Honda | HR-V | LX |
| 2022 | Honda | HR-V | Sport |
6 Reviews ★★★★★
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Bob | September 30th, 2022
Genuine Honda rear main seal.
Bryan S. | March 8th, 2022
While you already have the trans off while replacing the clutch, replace this too.
Kong | December 2nd, 2020
Fit perfectly no problem
William Lee | November 24th, 2020
What can I say, OEM Honda part = peace of mind. Though this is one of them things that, "if it ain't broke don't fix it."
But since you're changing out the clutch and everything is going to be apart anyways.... its always a good precaution.
Christopher Allen | October 9th, 2020
Perfect oem part from Honda quick delivery
