91 Acura Legend Manual Transmission

The 1991 Acura Legend features a sophisticated 5-speed manual transmission system designed for smooth shifting and optimal performance. This manual covers the technical specifications, operation procedures, maintenance guidelines, and troubleshooting for the manual transmission system in the 1991 Acura Legend. Below are key sections covering features, operation, maintenance, specifications, and common issues.

1. Transmission Features 2. Operation Guidelines 3. Technical Specifications 4. Maintenance Schedule 5. Fluid Requirements 6. Shifting Patterns 7. Clutch System 8. Common Issues 9. Troubleshooting 10. Service Information

Transmission Features

The 1991 Acura Legend manual transmission includes advanced features for enhanced driving experience and durability.

Feature	Description
Gear Configuration	5-speed forward, 1 reverse synchronized transmission
Shift Mechanism	Direct cable-operated shifter with short throw
Final Drive Ratio	4.066:1 for optimal acceleration and fuel economy
Synchromesh System	Carbon-lined synchronizers for smooth gear engagement
Case Material	Aluminum alloy housing for reduced weight
Lubrication System	Forced splash lubrication for gear protection
Mounting System	Hydraulic engine and transmission mounts

Operation Guidelines

Proper operation techniques for optimal transmission performance and longevity.

Clutch Engagement: Fully depress clutch pedal before shifting gears
Shifting Technique: Smooth, deliberate shifts without forcing the lever
Rev Matching: Match engine RPM when downshifting for smoother transitions
Gear Selection: Use appropriate gear for driving conditions and speed
Reverse Gear: Come to complete stop before engaging reverse

WARNING! Do not rest hand on shift lever while driving as this can cause premature wear of shift components.

Technical Specifications

Transmission Type: 5-speed manual, fully synchronized
Gear Ratios: 1st: 3.307, 2nd: 1.950, 3rd: 1.360, 4th: 1.034, 5th: 0.795, Reverse: 3.000
Final Drive Ratio: 4.066:1
Fluid Capacity: 2.2 quarts (2.1 liters)
Fluid Type: Honda MTF or equivalent 10W-30 motor oil
Shift Linkage: Cable-operated with adjustable mechanism
Clutch Type: Single dry disc with diaphragm spring
Clutch Fluid: DOT 3 or DOT 4 brake fluid

Maintenance Schedule

Regular maintenance ensures optimal transmission performance and longevity.

Transmission Fluid: Replace every 30,000 miles or 2 years
Clutch Fluid: Inspect monthly, replace every 2 years
Shift Linkage: Lubricate every 15,000 miles
Clutch System: Inspect for wear every 60,000 miles
Transmission Mounts: Inspect every 30,000 miles

NOTE: Severe driving conditions may require more frequent maintenance intervals.

Fluid Requirements

Proper fluid selection and maintenance critical for transmission health.

Fluid Type	Specification	Capacity
Transmission Fluid	Honda MTF or 10W-30 motor oil API SG or higher	2.2 quarts
Clutch Fluid	DOT 3 or DOT 4 brake fluid	As needed in reservoir
Shift Linkage Grease	Multi-purpose lithium grease	Light coating

CAUTION! Do not mix different types of transmission fluid. Use only recommended fluids.

Shifting Patterns

Standard H-pattern shifting configuration with reverse lockout.

Shift Pattern:

    R   1   3   5
    ┌───┬───┬───┐
    │   │   │   │
    ├───┼───┼───┤
    │   │   │   │
    └───┴───┴───┘
        2   4

Reverse Engagement: Depress clutch, move shifter left and up (may require lifting reverse lockout collar)

Recommended Shift Points: 1-2: 15 mph, 2-3: 25 mph, 3-4: 35 mph, 4-5: 45 mph

Clutch System

Hydraulic clutch system with self-adjusting mechanism.

Clutch Pedal: Hydraulic actuation with adjustable free play
Master Cylinder: Mounted on firewall, connects to clutch pedal
Slave Cylinder: Mounted on transmission bellhousing
Clutch Disc: Organic facing material, sprung hub design
Pressure Plate: Diaphragm spring type, balanced assembly
Release Bearing: Hydraulically actuated, self-centering

Clutch Pedal Free Play: 0.4-0.8 inches (10-20mm) at pedal pad

Common Issues

Typical problems encountered with 1991 Acura Legend manual transmission.

Hard Shifting: Worn synchronizers or incorrect fluid
Gear Grinding: Worn clutch or damaged synchronizers
Clutch Slippage: Worn clutch disc or contaminated surfaces
Fluid Leaks: Damaged seals or loose drain/fill plugs
Noise in Neutral: Worn input shaft bearing
Vibration: Worn transmission mounts or unbalanced components

Troubleshooting

Symptom	Possible Cause	Corrective Action
Difficulty shifting into gear	Low clutch fluid, air in system	Bleed clutch hydraulic system, check fluid level
Gear grinding during shifts	Worn synchronizers, clutch not disengaging	Check clutch adjustment, inspect synchronizers
Transmission noise in neutral	Worn input shaft bearing	Replace input shaft bearing assembly
Fluid leaks from transmission	Damaged seals, loose drain plug	Replace seals, tighten drain plug to specification
Vibration during acceleration	Worn transmission mounts	Inspect and replace transmission mounts as needed
Clutch pedal feels spongy	Air in hydraulic system	Bleed clutch hydraulic system

Service Information

For professional service and technical support:

Acura Customer Service: 1-800-382-2238
Technical Support: Contact local Acura dealership
Parts Availability: Genuine Acura parts through authorized dealers
Service Manuals: Available through Helm Incorporated
Warranty Information: Consult original vehicle warranty documentation

Note: Always use genuine Acura parts for optimal performance and reliability.