🏷️ Basic Information

Make:

Plymouth

Model:

Savoy, Belvedere, Plaza

Year:

1957, 1958

Chassis Codes:

P30, P31

Engine Codes:

LP1 (230 CID), LP2 (250 CID)

👋 Introduction

Positioning:

The 1957-1958 Plymouth models represented Chrysler Corporation's entry into the 'Forward Look' styling era, aiming for a stylish and modern appearance while maintaining practical appeal in the mid-size automobile segment.

Competitors:

Competed with models like the Chevrolet Bel Air/210, Ford Fairlane, and AMC Ambassador. Plymouth often positioned itself as a more value-oriented offering within the Chrysler family.

Styling:

Characterized by Virgil Exner's 'Forward Look' design language, featuring prominent tailfins, sweeping body lines, and often chrome embellishments. The 'Plaza' was the base model, 'Savoy' the mid-tier, and 'Belvedere' the top trim with more upscale features.

Powertrain:

Offered a range of V8 engines, known for their smooth operation and increasing power output compared to previous generations. Manual and automatic transmission options catered to different driver preferences.

📋 Manual Details

Coverage:

Diagnosis Procedures, Adjustments, Reconditioning, Lubrication, Maintenance

Pages:

517

Type:

Service and Repair Manual

Language:

English

Format:

Print (likely)

📖 Manual Coverage

Engine:

Overhaul, tuning, lubrication, cooling, fuel delivery (carburetor, fuel pump), ignition system, exhaust system.

Transmission:

Service and repair of manual transmissions (likely '3-speed' and '4-speed' options) and potentially the 'TorqueFlite' automatic transmission (if applicable to these models/years).

Chassis Suspension:

Front and rear suspension (independent front suspension, leaf springs rear), steering system (recirculating ball steering), shock absorbers, alignment procedures.

Brakes:

Hydraulic drum brake system service, master cylinder, wheel cylinders, brake lines, parking brake operation and adjustment.

Electrical:

12-volt electrical system, battery, generator/alternator (depending on specific build date), starter motor, ignition switch, lighting system (headlamps, taillamps, interior lights), wiring diagrams, fuse specifications.

Body And Trim:

Door mechanisms, window regulators, seat adjustments, exterior trim, interior panel removal and installation, body panel alignment, weatherstripping.

Heating And Ventilation:

Heater core service, blower motor, ducting, and control mechanisms.

Accessories:

Optional accessories such as radio, heater, wipers, and horns.

Maintenance:

Regular lubrication points and schedule, fluid level checks and changes (engine oil, transmission fluid, coolant, brake fluid, differential fluid), filter replacement (oil, air, fuel), spark plug maintenance, ignition timing adjustment, carburetor adjustment.

Troubleshooting:

Diagnostic flowcharts and symptom-based troubleshooting for common issues related to engine performance, starting, braking, electrical systems, and cooling.

Reconditioning:

Detailed procedures for engine rebuilds, transmission overhauls, brake system component replacement, suspension component renewal, and body component restoration.

Adjustments:

Precision adjustments for engine timing, carburetor mixture and idle speed, clutch pedal free play, brake shoe clearance, and door striker plates.

Depth:

Comprehensive. Covers routine maintenance to complete engine and drivetrain overhauls, including detailed torque specifications, clearances, and diagnostic procedures.

📊 Manual Specifications

Format:

Likely printed paper. If digital, typically PDF with searchable text and scanned pages.

Quality:

Expect original factory print quality or high-quality reproduction. Black and white illustrations and diagrams are standard for this era.

Binding:

Typically saddle-stitched or perfect bound for service manuals of this vintage.

Paper:

Durable paper stock suitable for workshop environments, often slightly off-white.

⚙️ Engine Specifications

Engine 230 Cid Flathead:

Displacement: 230.2 cubic inches (3.77 Liters). Configuration: Inline-6 (Flathead). Bore x Stroke: 3.25 in x 4.50 in. Compression Ratio: Approximately 7.0:1 to 7.4:1. Horsepower: ~130-135 HP. Torque: ~190-195 lb-ft. Fuel System: Single downdraft carburetor (e.g., Carter BBD).

Engine 250 Cid V8:

Displacement: 250 cubic inches (4.1 Liters). Configuration: V8 (Pushrod OHV). Bore x Stroke: 3.56 in x 3.28 in. Compression Ratio: Approximately 8.0:1 to 8.4:1. Horsepower: ~180-190 HP. Torque: ~240-250 lb-ft. Fuel System: Single downdraft carburetor (e.g., Carter 2-barrel).

Performance Notes:

The V8 engines provided a significant boost in performance over the previous year's offerings, contributing to the 'Forward Look' era's emphasis on style and modern capability. Acceleration and cruising comfort were key selling points.

Fuel Type:

Gasoline (Regular Octane).

Carburetor Types:

Single-barrel (likely for I6) and two-barrel (for V8) downdraft carburetors. Carburetor models would typically be from Carter or Rochester.

🔧 Transmission

Standard Transmission:

A 3-speed manual transmission was likely standard on lower trims or as a base option.

Optional Transmission:

A 3-speed 'TorqueFlite' automatic transmission was a popular and significant option, offering greater driving ease.

Transmission Features:

The TorqueFlite automatic featured a torque converter for smooth power transfer. Manual transmissions typically had a column-mounted shifter.

📐 Dimensions

Wheelbase:

Approximately 118 inches for most models.

Overall Length:

Around 200-205 inches, depending on body style (sedan, coupe, wagon).

Exterior Width:

Approximately 75-77 inches.

Exterior Height:

Around 55-59 inches, with a lower profile due to the 'Forward Look' design.

Curb Weight:

Varies by body style and engine, typically ranging from 3,200 to 3,600 lbs.

Gross Vehicle Weight Rating:

Approximate GVWR of 4,200-4,500 lbs.

🛡️ Safety Features

Crash Test Results:

Official crash test ratings as we know them today did not exist in 1957-1958. Safety considerations were primarily passive (seat belts were often optional, improved braking).

Active Safety:

Improved braking system (dual-circuit master cylinder was becoming more common across the industry, though single-circuit may still be present in early production), power steering (optional).

Passive Safety:

Stronger body construction for the era, optional seat belts (front lap belts), padded dashboard (optional), dual-speed wipers, dual headlights. 'Safety-Grip' steering wheel was also available.

💡 Technology Features

Infotainment System:

Basic AM radio, often with a single speaker. Optional push-button AM radio available. No complex displays or digital interfaces.

Driver Assistance Features:

Limited to power steering (optional), which aided maneuverability. No electronic driver aids or advanced safety systems were present.

Connectivity Features:

No connectivity features in the modern sense. Connectivity was limited to the radio signal for entertainment and information.

🔧 Maintenance

Oil Change:

Typically every 3,000-4,000 miles or 6 months, whichever comes first. Consult the specific manual for precise intervals and oil type.

Tune Up:

Spark plugs, points, and condenser every 10,000-15,000 miles. Ignition timing adjustment as needed.

Transmission Fluid:

Automatic transmission fluid change and filter replacement typically every 20,000-30,000 miles. Manual transmission fluid check and change less frequent, perhaps every 40,000-50,000 miles.

Engine Oil:

SAE 10W-30 or 20W-50, depending on climate and oil formulation of the era. Check manual for specific API service classification. Engine oil capacity: approximately 5 quarts (with filter).

Coolant:

Ethylene glycol-based antifreeze mixed with distilled water (50/50 ratio). Capacity varies by model, typically 15-18 quarts.

Brake Fluid:

DOT 3 or DOT 4 (if available and specified). Check manual for exact specification. Brake fluid is hygroscopic and should be flushed periodically, usually every 2 years.

Transmission Fluid Auto:

Dexron-III or equivalent (historically, Type A or Dexron-II). Capacity for TorqueFlite: approx. 12-14 pints (with converter).

Transmission Fluid Manual:

Gear oil, SAE 90W. Capacity approx. 2-3 pints.

Rear Axle Fluid:

Hypoid Gear Oil SAE 90W. Capacity approx. 3-4 pints.

Engine:

Flathead 6 can be prone to oil leaks, and overheating if cooling system is not maintained. V8 engines from this era may experience valve guide wear, lifter noise, and carburetor tuning issues. Oil slinger design may lead to pan leaks.

Transmission:

TorqueFlite automatics are generally robust but can develop issues with seals, clutches, and valve body problems if not serviced. Manual transmissions are typically durable but clutch wear and synchro issues can occur.

Brakes:

Drum brakes require regular adjustment and can be affected by moisture. Wheel cylinders and master cylinder seals are common wear items. Parking brake cable can seize.

Electrical:

Wiring harnesses can degrade over time, leading to shorts or intermittent failures. Generators require voltage regulator adjustment. Starter solenoids can fail. Lucas components (if used) were notoriously unreliable.

Body And Chassis:

Rust is a significant concern, especially in floor pans, rocker panels, and rear quarter panels. Body mounts and suspension bushings can wear out, leading to rattles and poor handling.

📚 Vehicle History

Brand History:

Plymouth was Chrysler Corporation's entry-level brand, known for producing reliable and affordable vehicles since its introduction in 1928. It often served as a proving ground for new styling and engineering concepts before they were applied to Dodge, DeSoto, and Chrysler models.

1957 Evolution:

Marked a radical departure with the 'Forward Look' design, moving away from previous styling cues. Offered a range of body styles including 2-door sedan, 4-door sedan, 2-door hardtop coupe, and 4-door hardtop sedan. Wagons were also available (e.g., Suburban, Sport Suburban).

1958 Evolution:

Minor styling updates over the 1957 model, including grille revisions and trim changes. Introduction of the 'TorqueFlite' automatic transmission as a widely available option. The 'Golden Commando' V8 became available with dual four-barrel carburetors for higher performance.

Production Period:

1957 and 1958 model years.

Manufacturing Locations:

Primary manufacturing occurred in the United States at various Chrysler Corporation assembly plants.

🏆 Awards & Recognition

Industry Awards:

Plymouth models of this era were generally well-regarded for their styling and value. Specific awards for 1957-1958 models are not widely documented in the manner of modern vehicles, but they were successful in capturing market share.

Consumer Ratings:

Consumer satisfaction in this period focused on reliability, performance, and styling. Plymouth's 'Forward Look' models were popular and contributed to Chrysler's sales success during these years.

Manufacturing Certifications:

N/A for this era of automotive production.