Limousines of the series 123
Mercedes-Benz type 300 D
Type 300 D 
Name 300 D 
Name Mercedes-Benz type 300 D 
Short name 300 D 
Model W 123 D 30 
Production 07.75/02.76 - 11.85 
Number produced 324.718 
Comments concerning the production period begin of production - pre-production batch / main production - end of production 
Prices 01.76: 22.311,00 DM 02.77: 23.321,10 DM 01.78: 23.531,20 DM 04.78: 24.404,80 DM 12.78: 24.897,60 DM 05.79: 25.093,60 DM 01.07.79: 25.317,65 DM 16.07.79: 25.809,20 DM 09.79: 26.148,20 DM 03.80: 27.176,50 DM 08.80: 27.685,00 DM 07.81: 28.645,50 DM 01.82: 29.425,20 DM 07.82: 30.464,80 DM 07.83: 30.734,40 DM 08.83: 31.692,00 DM 01.84: 32.433,00 DM 09.84: 33.402,00 DM 
Wheelbase 2795 mm 
Track rear/front 1488/1446 mm 
Length 4725 mm 
Width 1786 mm 
Height 1438 mm 
Smallest turning circle 11,29 m 
Chassis weight
Max. total weight 1970 kg 
Max. front axle weight 975 kg 
Max. rear axle weight 995 kg 
Max. load 520 kg 
Max. trailer weight braked 1200 kg; since 1980: 1500 kg 
Max. trailer weight unbraked 750 kg 
Weight empty 1450 kg 
According to guideline DIN 70020 (with fuel, spare wheel and tool equipment) 
Operating method four-stroke Diesel (with indirect injection) 
Configuration front, parallel; upright 
Type OM 617 D 30 / 617.912 
No. of cylinder/configuration 5 / in line 
Bore x stroke 91,0 x 92,4 mm; since 08.78: 90,9 x 92,4 mm 
Total displacement 3005 ccm (tax 2971 ccm); ab 08.78: 2998 ccm (tax 2938 ccm) 
Compression ratio 21,5 
Crankshaft bearing 6 
Output 80 hp / 59 kW at 4000 /min;~since 09.79: 88 hp / 65 kW at 4400 /min 
Maximum torque 172 Nm at 2400 /min 
No. of valves/configuration 1 intake, 1 exhaust / overhead 
Valve operation top camshaft 
Camshaft drive duplex roller-type chain 
Mixture formation indirect injection, mechanically controlled;~Bosch 5-plunger-type injection pump 
Cooling water cooling / pump; 11 l water 
Lubrication pressure circulation lubrication / 5 l oil 
Electric system 12 V 
Battery 88 Ah / in the engine compartment 
Dynamo three-phase AC / 770 W 
Starter motor electrical / 2,0 kW; since 1980: 2,3 kW 
Ignition compression ignition engine 
Fuel tank above the rear axle / 65 l 
Fuel supply piston pump at the injection pump 
Driven whells rear wheels 
Power transmission divided cardan shaft 
Frame desing self-supporting all-steel body 
Wheel suspension front double wishbone-front axle with torsion bar type stabilizer 
Wheel suspension rear diagonal-swing axle, on demand with hydropneumatic level control 
Suspension front coil springs, suppl. rubber suspension, torsion bar stabilizer 
Suspension rear coil springs, suppl. rubber suspension, torsion bar stabilizer 
Damper hydraulic telescopic damper 
Steering ball-and-nut power steering 
Steering transm ratio 14,20:1 / 2,7 steering wheel turns; since 1977: 16,55:1 / 3,2 
Breaking system braking system 
Breaking system hydraulic dual-circuit braking system with vacuum-operated brake ~servo unit, since 08.80 on demand with antilock device; disc brakes front and rear 
Parking breake parking brake 
Parking breake mechanical (foot-operated), effective on rear wheels 
Diamatre brake discs front / rear: 278 / 279 mm 
Wheels sheet steel-disc wheels, since 01.78 on demand light-alloy wheels 
Wheels rims 5 1/2 J x 14 H 2 
Tyres 175 SR 14 88 S 

Skrzynie biegów tego modelu (gearbox and performance):

Limousines of the series 123
Mercedes-Benz type 300 D
Gearbox 4-speed gear shift 
Availability Series 
Shifting Feed control 
Clutch Single-plate dry clutch 
Type of gearbox Pinion change gear 
Synchromesh gears I - IV 
Gear transmission I. 3,90; II. 2,30; III. 1,41; IV. 1,0; R. 3,66 
Differential ratio 3,46 
Maximum speed 148 km/h; from 09.79: 155 km/h 
Accelerations 19,9 s; from 09.79: 17,8 s 
Comments Acceleration with shifting through from 0 - 100 km/h; loaded with 2 persons 
Fuel consumption 7,8/11,5/10,3 l; from 10.81: 7,8/10,4/9,7 l 
acc. to guideline 80/1268/EWG; values for 90 km/h / 120 km/h / city cycle 
Limousines of the series 123
Mercedes-Benz type 300 D
Gearbox 5-speed gear shift 
Availability by request (from 02.82) 
Shifting Feed control 
Clutch Single-plate dry clutch 
Type of gearbox Pinion change gear 
Synchromesh gears I - V 
Gear transmission I. 3,82; II. 2,20; III. 1,40; IV. 1,0; V. 0,81; R. 3,71 
Differential ratio 3,46 
Maximum speed 155 km/h 
Accelerations 17,8 s 
Comments Acceleration with shifting through from 0 - 100 km/h; loaded with 2 persons 
Fuel consumption 7,0/9,5/9,7 l 
acc. to guideline 80/1268/EWG; values for 90 km/h / 120 km/h / city cycle 
Limousines of the series 123
Mercedes-Benz type 300 D
Gearbox 4-speed autom. gear shift 
Availability by request (until 06.83) 
Shifting Switch lever at steering wheel or in car center 
Clutch hydr. torque converter in autom. gear 
Type of gearbox Planet gear 
Synchromesh gears  
Gear transmission I. 3,98; II. 2,39; III. 1,46; IV. 1,0; R. 5,47 
Differential ratio 3,46 
Maximum speed 143 km/h; from 09.79: 150 km/h 
Accelerations 20,8 s; from 09.79: 19,2 s 
Comments Acceleration with shifting through from 0 - 100 km/h; loaded with 2 persons 
Fuel consumption 8,8/12,4/10,4 l; from 10.81: 8,1/11,0/9,8 s 
acc. to guideline 80/1268/EWG; values for 90 km/h / 120 km/h / city cycle 
Limousines of the series 123
Mercedes-Benz type 300 D
Gearbox 4-speed autom. gear shift 
Availability by request (from 07.83) 
Shifting Switch lever at steering wheel or in car center 
Clutch hydr. torque converter in autom. gear 
Type of gearbox Planet gear 
Synchromesh gears  
Gear transmission I. 4,25; II. 2,41; III. 1,49; IV. 1,0; R. 5,67 
Differential ratio 3,46 
Maximum speed 150 km/h 
Accelerations 19,2 s 
Comments Acceleration with shifting through from 0 - 100 km/h; loaded with 2 persons 
Fuel consumption 7,9/10,7/9,7 l 
acc. to guideline 80/1268/EWG; values for 90 km/h / 120 km/h / city cycle