Mercedes-Benz L 911

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Mercedes Benz
L 911
L 911
L 911
Manufacturer: Daimler-Benz AG
Sales designation: L 328 (until 1963)
L 911 (from 1963)
Production period: 1961-1984
Previous model: L 312
Successor: none
Technical specifications
Designs: Short-nosed ,
cab-over-engine
Engines: OM 312,
OM 321
,
OM 352
(all diesel, 4.6-5.7 l)
Power: 74-96 kW
Length: 5445-8825 mm
Width: 2340-2500 mm
Height: 2370-2510 mm
Wheelbase: 3200-4830 mm
Turning circle: 12.8-17.9 m
Payload: 4.64-5.925 t
Perm. Total weight: 9 t

The Mercedes-Benz L 911 is a medium-duty two-axle truck of the Mercedes-Benz brand that was built at the Mercedes-Benz plant in Mannheim . It was produced from 1961 and replaced the L 312 . The vehicle was sold as the L 328 until 1963 . The short-nosed L 911 is available as a flatbed and tipper truck, as a chassis for special bodies and as a tractor unit, with or without all-wheel drive. It was also built as a forward control .

overview

The L 911 belongs to the short-nosed model range from Mercedes-Benz , which was reissued with the L 1113 in 1959. Compared to the L 312 , the short-nosed cars have been completely redeveloped, but the pre-chamber engines of the OM 312 series of the L 312 with a displacement of 4580 cm³ and 100 hp (74 kW) were still used in the L 911 until at least May 1962. From November 1962 at the latest, engines of the OM 321 series were installed, with a displacement of 5103 cm³ and 110 hp (81 kW). From 1964, the pre-chamber engines were finally replaced by the direct injection engines of the OM 352 series with a displacement of 5675 cm³, which were throttled to 110 hp (81 kW). Compared to pre-chamber engines, they are characterized by higher torque and should consume less fuel. A prototype was also built for the Federal Office for Civil Protection and Disaster Assistance with an OM 352 that was not throttled and developed 130 hp (96 kW). From 1967 the vehicles underwent a major facelift in which the windshield of the short-nosed vehicles was raised. The front handlebars got a completely new look.

Models

The L 911 is available in different versions:

  • L 911: basic model, flatbed or chassis, rear-wheel drive
  • LK 911: Rear-wheel drive tipper
  • LA 911: platform or chassis with all-wheel drive
  • LAK 911: tipper with all-wheel drive
  • LS 911: tractor with rear-wheel drive
  • LAS 911: tractor with all-wheel drive
  • LP 911: forward control with a flatbed or as a chassis
  • LPS 911: front-link tractor
  • LAF 911: vehicle for special bodies with all-wheel drive

technology

Chassis and power transmission

Leaf spring on the front axle of a LAF 911, also easily visible telescopic shock absorber

All L 911 models are two-axle trucks with ladder frames and rigid axles at the front and rear. The axles are suspended on semi-elliptical leaf springs, the rear axle also has additional springs. The front axle is dampened with telescopic shock absorbers . The four wheels are steel disc wheels, the rear axle has double tires, the front axle single. As standard, the size 8.25–20 tires are mounted on split tapered shoulder rims of size 6.5–20. Apart from Daimler-Benz, Bosch and Teves were the suppliers for the brake system. The brake system is a hydraulically operated dual-circuit brake system with a single-chamber compressed air brake aid; the braking force acts on brake drums with a diameter of 400 mm on the front wheels and 408 mm on the rear wheels, with the exception of front control vehicles from 1967, whose brake drum diameter is 418 mm. The handbrake is a spring-loaded brake and acts on the rear wheels. The manufacturer of the steering is Daimler-Benz; it is a recirculating ball steering system with an undivided tie rod. All vehicles were available as both left-hand and right-hand drive.

The force from the engine via a single dry type Fichtel & Sachs H 32 transmitted to the transmission. The gearbox is a fully synchronized five-speed gearbox from Daimler-Benz that is interlocked with the engine. It is shifted with a shift lever next to the driver's seat, which acts directly on the transmission. The drive is from the transmission power via an articulated shaft to a hypoid - bevel gear axle drive transmitted to the rear axle.

Transfer case of a LAF 911

All-wheel drive models have three cardan shafts as a power transmission element. They also have a transfer case with on-road and off-road transmission. The ratio from the gearbox to the front axle is 6.833: ​​1 higher than that to the rear axle with 6.857: 1. The drive of the front wheels must be switched on manually. The differential gears can be locked.

engine

The engine is in the first vehicles of the Mercedes-Benz OM 312 , a standing rows - six cylinder - four cycle - Diesel engine having two valves , indirect injection and water cooling . The cylinder block made of molybdenum alloy cast iron and the split crankcase are made from a single cast. With a cylinder bore of 90 mm and a piston stroke of 120 mm, the engine has a total displacement of 4580 cm³. The pistons are forged pistons made of light metal from Mahle , each with four compression rings and two oil control rings . The force is transmitted via diagonally split connecting rods made of heat-treated steel to a forged crankshaft with seven bearings, flame-hardened at the bearings. The connecting rod and crankshaft have lead bronze plain bearings with steel support shells. The crankshaft has six counterweights and a vibration damper.

A camshaft with four bearings in plain bearings runs in the crankcase and is driven by helical spur gears. It operates the hanging valves via bumpers and rocker arms . Each cylinder has an inlet and an outlet valve. The cylinder head that covers all cylinders has an asbestos-containing seal.

The pressure circulation lubrication works with a gear oil pump in the oil sump and a slot filter in the main flow. The fuel pump conveys the fuel from the tank through a felt tube filter to the Bosch PES 6 A70 B 410 RS 64/7 injection pump, which injects it into the prechambers via Bosch DNO SD 211 injection nozzles . The injection pump has a centrifugal governor. The air is sucked in in front of the cooler and cleaned with an oil bath air filter. The engine is cooled with a tube cooler, the warm exhaust air of which is blown away by a fan.

The OM 321 engines used from 1962 are based on the OM 312 and have a larger displacement. The engines of the OM 352 series, on the other hand, are direct injection.

Technical specifications

1961–1962

Parameters L 328 LK 328 LP 328 LA 328 LAK 328 LAS 328 LS 328 LPS 328
Dimensions and weights
Wheelbase (mm) 3600 4200 4830 3600 3200 3600 4200 4830 3600 4200 3600 3200 3600 3200 3600 3200 3600
Length (mm) 6175 6875 7875 6045 6330 7330 7725 8825 5845 6515 6045 5445 5845 5445 5845 5655 6035
width (mm) 2340 2500 2340 2500
Height (mm) 2370 2470 2510 2370 2470
Front track (mm) 1905 1820 1890 1905
Rear track (mm) 1725
Ground clearance (mm) 255
Turning circle diameter (m) 13.6 15.2 16.9 13.6 12.8 13.9 15.5 17.2 15.9 17.9 15.9 14.6 15.9 12.6 13.6 12.8 13.9
Empty weight kg) 3500 3570 3800 4000 3585 3700 - - - - 4360 3415 3450 3075 3095 3155 3160
Payload (kg) 5500 5430 5200 5000 5415 5300 - - - - 4640 5585 5550 5925 5905 5865 5840
Maximum permissible total weight (kg) 9000
Powertrain
coupling Single-disc dry clutch
Fichtel & Sachs H 32
transmission Manually shiftable five-speed gearbox from Daimler-Benz, fully synchronized
Drive on Rear wheels All wheels Rear wheels
Gear ratios 1st gear: 8.98
2nd gear: 4.785
3rd gear: 2.736
4th gear: 1.663
5th gear: 1.00
R. gear: 8.29
Translation from the gearbox to the rear axle 6.857
Translation from the gearbox to the front axle - 6.833 -
Top speed (km / h) 75.5 73 75.5
Effective total braking area (cm 2 ) 2200
engine
Engine type Mercedes-Benz OM 312
Engine structure Six-cylinder in-line four-stroke diesel engine
Mixture formation Pre-chamber injection
Valve control hanging valves, two valves
cooling Water cooling
Bore × stroke 90 × 120 mm
Displacement 4580 cc
Nominal power according to DIN 70020 100 DIN-PS (74 kW) at 3000 min -1
Maximum torque according to DIN 70020 27 kpm (265 Nm) at 1600 min −1
Medium piston speed 12 m / s
Compression ratio 19.8: 1
Injection pressure 132 bar
Firing order 1-5-3-6-2-4
Inlet valve opens 22 ° before top dead center
Inlet valve closes 58 ° after bottom dead center
Outlet valve opens 56 ° before bottom dead center
Outlet valve closes 26 ° after top dead center
Engine ground 385 kg
Oil consumption (ml / 100 km) 200
Fuel consumption according to DIN 70030 (l / 100 km) 14.9 16.5 depending on the trailer
Filling quantities
Capacity of the fuel tank (l) 100
Oil pan capacity (l) 7-9
Capacity of the cooling system (l) 21st 24
Capacity of the gearbox housing (l) 3.7
Electrical system
Glow plugs 36 W heating power
Starter 12 V thrust armature starter Bosch BNG 4/12 CR 201 (electromagnetically operated)
alternator Bosch LJ / GG 240 / 12-2400 R16 (12 V, 240 W)
V-belt drive, the start of charging at 928 min -1 on the crankshaft
battery 1 × lead acid accumulator 12 V, 135 Ah

Technical data OM 321 (1962–1963)

Parameters OM 321
Engine type Series - six-cylinder - four stroke - Two valve - OHV - antechamber - diesel engine
cooling Water cooling
Inlet valve opens 22 ° before top dead center
Inlet valve closes 58 ° after bottom dead center
Outlet valve opens 56 ° before bottom dead center
Outlet valve closes 26 ° after top dead center
Firing order 1-5-3-6-2-4
Engine ground 385 kg
Injection pressure 127.5 bar
Starter Thrust armature starter Bosch BNG 4/12 CR 201
Bore × stroke 95 × 120 mm
Compression ratio 20.8: 1
Displacement 5103 cc
Nominal power according to DIN 70020 110  DIN-PS (81 kW) at 3000 min -1
Maximum torque according to DIN 70020 30.5  kpm (299 Nm) at 1600 min −1

Technical data OM 352 (from 1964)

Parameters OM 352
Engine type Six-cylinder in-line four-stroke diesel engine
Mixture formation Direct injection
Valve control OHV valve control, two valves
cooling Water cooling
Bore × stroke 97 × 128 mm
Displacement 5675 cc
Nominal power according to DIN 70020 110 DIN-HP (81 kW) at 2900 min -1
Maximum torque according to DIN 70020 32 kpm (314 Nm) at 1600 min −1
Medium piston speed 12.4 m / s
Compression ratio 17: 1
Injection pressure 196 bar
Firing order 1-5-3-6-2-4
Inlet valve opens 29 ° before top dead center
Inlet valve closes 55.9 ° after bottom dead center
Outlet valve opens 54 ° before bottom dead center
Outlet valve closes 20.8 ° after top dead center
Engine ground 410 kg
Oil consumption (ml / 100 km) 250

Individual evidence

  1. Daimler-Media: The end of the long hoods: The first short-hooded hoods came in 1959 . February 5, 2009
  2. a b BBK : data sheet rescue vehicle . 1971

literature

Web links

Commons : Mercedes-Benz L 911  - Collection of pictures, videos and audio files
Commons : Mercedes-Benz LA 911  - Collection of pictures, videos and audio files