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Product Details
The Honda OEM B-Series Manual Transmission Mainshaft Ball Bearing is a genuine factory replacement designed to provide smooth rotation, precise shaft support, and dependable operation in compatible Honda and Acura manual transmissions. Manufactured to Honda's original equipment specifications, this precision-engineered bearing measures 28mm x 60mm x 15mm and is designed for the mainshaft (input shaft) assembly.
Commonly used in B-Series manual transmissions found in vehicles such as the 1999–2000 Honda Civic Si, 1994–1997 Honda del Sol VTEC, and select Acura Integra models, this genuine Honda bearing is an excellent replacement for worn or damaged original transmission components.
Manual transmission bearings play a critical role in supporting the transmission's rotating shafts while minimizing friction and maintaining proper gear alignment. Over time, bearings can develop wear from mileage, contaminated transmission fluid, excessive loading, or high-performance driving.
A worn mainshaft bearing may contribute to transmission whining, excessive vibration, abnormal shaft movement, or accelerated wear of surrounding transmission components.
Whether you're rebuilding a B16 or B18 transmission, refreshing a high-mileage gearbox, or preparing a Honda B-Series drivetrain for a performance build, this genuine Honda OEM Mainshaft Ball Bearing provides the factory-correct dimensions and construction needed for reliable transmission operation.
Features
- Genuine Honda OEM Part: Authentic factory replacement manufactured to Honda's original equipment specifications.
- Manual Transmission Mainshaft Bearing: Designed to support the mainshaft/input shaft in compatible B-Series manual transmissions.
- Precision Ball Bearing Construction: Provides smooth rotational movement while supporting transmission shaft loads.
- 28mm Inner Diameter: Factory-specified internal bearing dimension.
- 60mm Outer Diameter: Designed to fit the corresponding factory transmission housing bore.
- 15mm Width: Maintains the original bearing dimensions.
- Direct OEM Replacement: Replaces the original bearing where Honda specifies part number 91002-PS1-003.
- Factory-Correct Fit: Maintains the intended bearing geometry and shaft support.
- Reduced Friction: Helps provide smooth transmission shaft rotation.
- Ideal for Transmission Rebuilds: Excellent for B16 and compatible B18 manual transmission service.
- Performance Build Friendly: Suitable for compatible naturally aspirated, turbocharged, and supercharged B-Series drivetrain projects.
- Sold Individually: Includes one genuine Honda mainshaft ball bearing.
- OEM Part Number: 91002-PS1-003.
Additional Information
- Manufacturer: Honda / Acura
- Part Number: 91002-PS1-003
- OEM Description: Bearing, Ball (28x60x15)
- Other Names: Mainshaft Bearing / Input Shaft Bearing / Manual Transmission Ball Bearing / B-Series Transmission Bearing
- Product Type: Manual Transmission Bearing
- Installation Location: Mainshaft / Input Shaft – Front Bearing Position
- Inner Diameter: 28mm
- Outer Diameter: 60mm
- Width: 15mm
- Bearing Type: Ball Bearing
- Quantity: Sold Individually (1 Bearing)
Common Reasons for Replacement
Manual transmission bearings should be inspected whenever the gearbox is disassembled for maintenance or rebuilding.
- Transmission whining or abnormal bearing noise
- Rough or noisy shaft rotation
- Excessive mainshaft movement
- Worn or damaged bearing races
- Pitting or deterioration of bearing surfaces
- Contaminated or insufficient transmission fluid
- High-mileage transmission rebuilding
- Gear or synchronizer replacement
- B16/B18 transmission restoration
- Performance transmission assembly
- Replacing a worn mainshaft bearing helps restore proper shaft support and can prevent additional damage to surrounding transmission components.
Installation Notes
- Proper installation is essential for maintaining correct transmission shaft alignment and bearing performance.
- Before installation, inspect the transmission mainshaft, bearing seating surfaces, and transmission housing for wear or damage.
- Confirm that the replacement bearing matches the original component's dimensions and specifications.
- Use appropriate bearing removal and installation equipment to prevent damage to the bearing races, shaft, or transmission housing.
- Important: Apply installation force only to the appropriate bearing race according to the factory service procedure. Improper pressing techniques can damage a new bearing before the transmission is reassembled.
- Inspect related transmission bearings, synchronizers, gears, and shaft components while the gearbox is disassembled.
- Follow the Honda factory service manual for the correct installation procedures, transmission clearances, and reassembly specifications.
- After reassembly, refill the transmission with the manufacturer-specified manual transmission fluid and verify proper operation.
Note:
- Includes one genuine Honda OEM Mainshaft Ball Bearing (28x60x15mm). Transmission shafts, gears, synchronizers, seals, and additional bearings are sold separately unless otherwise specified.
For Honda and Acura enthusiasts rebuilding a B-Series manual transmission, restoring an original Civic Si or Integra drivetrain, or preparing a performance gearbox, this genuine Honda OEM Mainshaft Ball Bearing delivers factory-correct dimensions and dependable transmission shaft support.
| Part Number: | 91002-PS1-003 |
| 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
This part does not have vehicle specific fitment. Please contact us if you need assistance.
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