This comprehensive 3867-page service manual covers the Mercedes-Benz W114 series Stroke Eight sedans and wagons from 1967 to 1976. Complete inline-six engine overhaul for M129, M130, and M110 variants, Bosch D-Jetronic fuel injection servicing, transmission rebuild, suspension geometry, brake servicing, and complete wiring diagrams. Includes specifications, adjustment procedures, and troubleshooting guidance for all mechanical and electrical systems. The definitive reference for Mercedes-Benz classic car restorers and specialist technicians.
1967-1976 Mercedes-Benz W114 Service Repair Workshop Manual PDF
VEHICLE/EQUIPMENT INTRODUCTION:
The Mercedes-Benz W114 (and closely related W115) series, known internally as the Strich Acht (Stroke Eight) models, marked a significant milestone in Mercedes-Benz engineering history as the first post-war generation of compact executive sedans designed from scratch. Introduced in 1967 and produced through 1976, these elegant vehicles featured modern unibody construction, fully independent four-wheel suspension, and a range of refined inline-six engines in the W114 variants. The W114 specifically denotes the six-cylinder models including the 230, 250, 280, and the renowned 280E with Bosch D-Jetronic electronic fuel injection. These cars were engineered to the exacting standards Mercedes became famous for, with extensive use of durable materials, generous maintenance access points, and design lifespans measured in decades rather than years. Many surviving examples remain in daily service, testament to their overbuilt engineering.
SERVICE & REPAIR SCOPE:
- Complete inline-six engine overhaul including M129, M130, and M110 engine variants
- Cylinder head removal, valve seat regrinding, and camshaft bearing inspection
- Bosch D-Jetronic fuel injection system servicing and calibration
- Carburetor (Stromberg) setup and adjustment for carbureted variants
- Four-speed manual transmission rebuild with overdrive servicing
- Automatic transmission valve body inspection and band adjustment
- Complete ignition system servicing with distributor timing specifications
- Suspension control arm bushing replacement and ball joint service
- Rear semi-trailing arm alignment and subframe bushing inspection
- Power steering box adjustment, recirculating ball service, and idler arm inspection
- Brake system brake booster testing, caliper rebuild, and proportioning valve service
- Electrical alternator overhaul and voltage regulator testing
- Complete body wiring harness diagram reference
- Heating and ventilation system blend door adjustment and heater core replacement
- Body rust repair reference and structural panel identification
- Interior wood trim, leather, and seat upholstery service procedures
TECHNICAL SPECIFICATIONS:
- Vehicle: Mercedes-Benz W114 series (/8 Stroke Eight)
- Model years: 1967 through 1976
- Engine options: M129 2.3L inline-six, M130 2.5L inline-six, M110 2.8L inline-six (carbureted and fuel-injected 280E)
- Valve train: SOHC inline-six with single or dual carburetors, or D-Jetronic EFI
- Transmissions: 4-speed manual, 4-speed automatic, 5-speed manual with overdrive
- Drive layout: Front engine, rear-wheel drive
- Front suspension: Independent double wishbone with coil springs
- Rear suspension: Semi-trailing arm independent rear suspension
- Brakes: Front disc, rear disc, hydraulic with power booster
- Steering: Recirculating ball with power assistance
- Body: 4-door sedan, 5-door station wagon (S-114)
DIAGNOSTIC INFORMATION:
- Fuel injection running rough (280E): Test each fuel injector pulse width, check coolant temperature sensor resistance (critical for D-Jetronic enrichment), inspect vacuum hoses to MAP sensor, verify D-Jetronic ECU connectors clean and tight
- Oil leak at timing cover: Remove front cover, replace timing cover gasket and crankshaft front oil seal, inspect timing chain guides (plastic guides commonly fail on M110 engines)
- Overheating in traffic: Inspect viscous fan clutch engagement, verify thermostat opening temperature (80C or 87C variants), clean radiator with compressed air from engine side, check water pump impeller condition
- Automatic transmission shifting late: Adjust throttle pressure (TP) adjustment screw on valve body, check vacuum modulator line for leaks, verify idle speed is within specification
- Rear end clunk on deceleration: Inspect rear differential mounting bushings, check semi-trailing arm bushing wear, examine driveshaft flex disc (guibo) for cracking
- Fuel vapor smell in garage: Inspect charcoal canister connections, check fuel tank vent lines, verify fuel filler cap seals properly
- Electrical system charging issues: Test alternator output at rear output terminal, inspect voltage regulator brush wear, check all battery ground strap connections to body and engine block
- Steering wander and play: Check steering box lash adjustment, inspect pitman arm nut tightness, verify idler arm bushing condition, check tie rod end ball socket play
ILLUSTRATIONS & DIAGRAMS INCLUDED:
- Complete inline-six engine cross-sections for M129, M130, and M110
- Bosch D-Jetronic fuel injection schematic with sensor locations
- Stromberg carburetor cross-section with jet adjustment reference
- Complete engine bay layout with accessory drive belt routing
- Front and rear suspension geometry with alignment specification tables
- Brake system hydraulic schematic with power booster detail
- Alternator exploded view with voltage regulator wiring
- Complete electrical wiring harness diagram with all circuit references
- Heating and ventilation ducting layout with blend door positions
- Body shell structure showing critical rust concern areas
- Interior trim and dashboard assembly exploded views
COMPATIBILITY:
- Mercedes-Benz W114 series (inline-six models): 230, 250, 280, 280E
- Model years 1967 through 1976
- Sedan and station wagon (S-114) body styles
- All engine variants: M129, M130, M110 (carbureted and fuel-injected)
- Manual and automatic transmission configurations
- 3867 pages of comprehensive service information
- English language edition
- PDF format, fully searchable and printable
FILE PROPERTIES:
- Format: Searchable PDF (3867 pages)
- Language: English
- Delivery: Instant digital download
- Access: Download anytime after purchase
1967-1976 Mercedes-Benz W114 Service Repair Workshop Manual PDF
VEHICLE/EQUIPMENT INTRODUCTION:
The Mercedes-Benz W114 (and closely related W115) series, known internally as the Strich Acht (Stroke Eight) models, marked a significant milestone in Mercedes-Benz engineering history as the first post-war generation of compact executive sedans designed from scratch. Introduced in 1967 and produced through 1976, these elegant vehicles featured modern unibody construction, fully independent four-wheel suspension, and a range of refined inline-six engines in the W114 variants. The W114 specifically denotes the six-cylinder models including the 230, 250, 280, and the renowned 280E with Bosch D-Jetronic electronic fuel injection. These cars were engineered to the exacting standards Mercedes became famous for, with extensive use of durable materials, generous maintenance access points, and design lifespans measured in decades rather than years. Many surviving examples remain in daily service, testament to their overbuilt engineering.
SERVICE & REPAIR SCOPE:
- Complete inline-six engine overhaul including M129, M130, and M110 engine variants
- Cylinder head removal, valve seat regrinding, and camshaft bearing inspection
- Bosch D-Jetronic fuel injection system servicing and calibration
- Carburetor (Stromberg) setup and adjustment for carbureted variants
- Four-speed manual transmission rebuild with overdrive servicing
- Automatic transmission valve body inspection and band adjustment
- Complete ignition system servicing with distributor timing specifications
- Suspension control arm bushing replacement and ball joint service
- Rear semi-trailing arm alignment and subframe bushing inspection
- Power steering box adjustment, recirculating ball service, and idler arm inspection
- Brake system brake booster testing, caliper rebuild, and proportioning valve service
- Electrical alternator overhaul and voltage regulator testing
- Complete body wiring harness diagram reference
- Heating and ventilation system blend door adjustment and heater core replacement
- Body rust repair reference and structural panel identification
- Interior wood trim, leather, and seat upholstery service procedures
TECHNICAL SPECIFICATIONS:
- Vehicle: Mercedes-Benz W114 series (/8 Stroke Eight)
- Model years: 1967 through 1976
- Engine options: M129 2.3L inline-six, M130 2.5L inline-six, M110 2.8L inline-six (carbureted and fuel-injected 280E)
- Valve train: SOHC inline-six with single or dual carburetors, or D-Jetronic EFI
- Transmissions: 4-speed manual, 4-speed automatic, 5-speed manual with overdrive
- Drive layout: Front engine, rear-wheel drive
- Front suspension: Independent double wishbone with coil springs
- Rear suspension: Semi-trailing arm independent rear suspension
- Brakes: Front disc, rear disc, hydraulic with power booster
- Steering: Recirculating ball with power assistance
- Body: 4-door sedan, 5-door station wagon (S-114)
DIAGNOSTIC INFORMATION:
- Fuel injection running rough (280E): Test each fuel injector pulse width, check coolant temperature sensor resistance (critical for D-Jetronic enrichment), inspect vacuum hoses to MAP sensor, verify D-Jetronic ECU connectors clean and tight
- Oil leak at timing cover: Remove front cover, replace timing cover gasket and crankshaft front oil seal, inspect timing chain guides (plastic guides commonly fail on M110 engines)
- Overheating in traffic: Inspect viscous fan clutch engagement, verify thermostat opening temperature (80C or 87C variants), clean radiator with compressed air from engine side, check water pump impeller condition
- Automatic transmission shifting late: Adjust throttle pressure (TP) adjustment screw on valve body, check vacuum modulator line for leaks, verify idle speed is within specification
- Rear end clunk on deceleration: Inspect rear differential mounting bushings, check semi-trailing arm bushing wear, examine driveshaft flex disc (guibo) for cracking
- Fuel vapor smell in garage: Inspect charcoal canister connections, check fuel tank vent lines, verify fuel filler cap seals properly
- Electrical system charging issues: Test alternator output at rear output terminal, inspect voltage regulator brush wear, check all battery ground strap connections to body and engine block
- Steering wander and play: Check steering box lash adjustment, inspect pitman arm nut tightness, verify idler arm bushing condition, check tie rod end ball socket play
ILLUSTRATIONS & DIAGRAMS INCLUDED:
- Complete inline-six engine cross-sections for M129, M130, and M110
- Bosch D-Jetronic fuel injection schematic with sensor locations
- Stromberg carburetor cross-section with jet adjustment reference
- Complete engine bay layout with accessory drive belt routing
- Front and rear suspension geometry with alignment specification tables
- Brake system hydraulic schematic with power booster detail
- Alternator exploded view with voltage regulator wiring
- Complete electrical wiring harness diagram with all circuit references
- Heating and ventilation ducting layout with blend door positions
- Body shell structure showing critical rust concern areas
- Interior trim and dashboard assembly exploded views
COMPATIBILITY:
- Mercedes-Benz W114 series (inline-six models): 230, 250, 280, 280E
- Model years 1967 through 1976
- Sedan and station wagon (S-114) body styles
- All engine variants: M129, M130, M110 (carbureted and fuel-injected)
- Manual and automatic transmission configurations
- 3867 pages of comprehensive service information
- English language edition
- PDF format, fully searchable and printable
FILE PROPERTIES:
- Format: Searchable PDF (3867 pages)
- Language: English
- Delivery: Instant digital download
- Access: Download anytime after purchase
