1991 Acura Integra Manual Transmission

The 1991 Acura Integra features a reliable 5-speed manual transmission system known for its smooth shifting and durable performance. This manual covers the B18A1 engine pairing, transmission specifications, maintenance procedures, troubleshooting, and repair guidelines for the manual transmission system. Below are key sections covering features, operation, maintenance, and common issues.

1. Transmission Specifications 2. Operation and Shifting 3. Maintenance Schedule 4. Fluid Requirements 5. Clutch System 6. Common Issues 7. Troubleshooting 8. Repair Procedures 9. Parts and Components 10. Warranty Information

Transmission Specifications

The 1991 Acura Integra manual transmission is a 5-speed synchronized gearbox designed for optimal performance and fuel efficiency.

Specification	Details
Transmission Type	5-speed manual
Gear Ratios	1st: 3.250, 2nd: 1.900, 3rd: 1.250, 4th: 0.909, 5th: 0.702
Final Drive Ratio	4.266:1
Synchro System	Double-cone synchronizers
Case Material	Aluminum alloy
Weight	Approximately 75 lbs (34 kg)
Compatible Engine	B18A1 1.8L DOHC
Shift Linkage	Cable-operated
Fluid Capacity	2.1 quarts (2.0 liters)
Fluid Type	Honda MTF or 10W-30 motor oil

Operation and Shifting

Proper shifting technique ensures longevity and optimal performance of the transmission system.

Clutch operation: Fully depress clutch pedal before shifting gears.
Shifting pattern: Follow H-pattern with reverse gear to the right and down.
Synchronization: Allow synchronizers to match speeds before engaging gears.
Rev-matching: Match engine RPM to transmission speed when downshifting.

WARNING! Avoid forcing gears and grinding during shifts to prevent transmission damage.

Maintenance Schedule

Regular maintenance ensures optimal transmission performance and longevity.

Fluid changes: Replace transmission fluid every 30,000 miles or 2 years.
Clutch inspection: Check clutch wear every 15,000 miles.
Shift linkage: Lubricate and inspect every 10,000 miles.
Transmission mounts: Inspect for wear every 25,000 miles.

CAUTION! Use only recommended fluids and follow torque specifications during maintenance.

Fluid Requirements

Recommended Fluid: Honda Manual Transmission Fluid (MTF)
Alternative: 10W-30 high-quality motor oil
Capacity: 2.1 quarts (2.0 liters)
Change Interval: Every 30,000 miles or 2 years
Drain Plug Torque: 29 lb-ft (39 Nm)
Fill Plug Torque: 33 lb-ft (44 Nm)
Fluid Type: GL-4 or GL-5 gear oil not recommended

Clutch System

The clutch system works in conjunction with the manual transmission for smooth gear engagement.

Components: Clutch disc, pressure plate, throwout bearing, clutch master cylinder, slave cylinder.

Clutch pedal free play: 0.4-0.8 inches (10-20mm). Hydraulic system: Uses DOT 3 or DOT 4 brake fluid. Clutch disc diameter: 8.0 inches. Engagement: Smooth and progressive with minimal pedal effort. Wear indicators: Slipping during acceleration, difficulty shifting, clutch pedal vibration.

Common Issues

Typical problems encountered with the 1991 Acura Integra manual transmission.

Grinding gears: Worn synchronizers or low fluid level.
Difficulty shifting: Clutch hydraulic issues or worn shift linkage.
Transmission noise: Worn bearings or insufficient lubrication.
Fluid leaks: Damaged seals or loose drain/fill plugs.

Tip: Address issues promptly to prevent further transmission damage.

Troubleshooting

Systematic approach to diagnosing manual transmission problems.

Symptom	Possible Cause	Corrective Action
Grinding in specific gears	Worn synchronizers	Replace synchronizer assembly; check fluid level and condition.
Difficulty engaging all gears	Clutch not disengaging	Check clutch hydraulic system; adjust pedal free play.
Transmission whining noise	Worn bearings	Inspect and replace input/output shaft bearings.
Leaking fluid	Damaged seals	Replace axle seals, input shaft seal, or case half seals.
Vibration during clutch engagement	Worn pressure plate or disc	Replace clutch components; resurface flywheel.

Diagnosis: Always check simplest solutions first (fluid level, linkage adjustment) before major disassembly.

Repair Procedures

Step-by-step instructions for common transmission repairs.

Fluid change: Remove fill plug, then drain plug; refill until fluid runs from fill hole.
Clutch replacement: Remove transmission, replace clutch components, resurface flywheel.
Shift linkage adjustment: Loosen lock nuts, adjust cables for precise shifting.
Seal replacement: Remove affected components, clean surfaces, install new seals.
Bearing replacement: Disassemble transmission, press out old bearings, install new ones.

WARNING! Use proper tools and follow torque specifications; transmission is heavy - use lift support.

Parts and Components

Key components of the 1991 Acura Integra manual transmission system.

Component	Part Number	Description
Transmission Assembly	Y2K5-100	Complete 5-speed manual transmission
Clutch Kit	22100-PR3-306	Includes disc, pressure plate, throwout bearing
Shift Cable	54110-SH3-306	Right side shift control cable
Transmission Mount	50810-SH3-306	Right side transmission mount
Input Shaft Seal	91213-PR3-003	Transmission input shaft oil seal

Warranty Information

Original warranty coverage and service information for the transmission system.

Original warranty: 3 years/36,000 miles basic warranty. Transmission specifically covered against defects in materials and workmanship. For service, contact authorized Acura dealerships. Current support available through Honda/Acura service centers. For technical assistance, contact 1-800-TO-ACURA or visit www.acura.com.