Types 300 - 300 d (W 186, W 189)
Mercedes-Benz type 300 Cabriolet D
Type 300 Cabriolet D 
Name 300 Cabriolet D 
Name Mercedes-Benz type 300 Cabriolet D 
Short name 300 Cabriolet D 
Model W 186 II 
Production 04.51/03.52 - 04.54 
Number produced 455 
Comments concerning the production period begin of production - pre-production batch / main production - end of production 
Prices 23.700,00 DM 
Wheelbase 3050 mm 
Track rear/front 1480/1525 mm 
Length 4950 mm 
Width 1838 mm 
Height 1640 mm 
Smallest turning circle 12,6 m 
Chassis weight
Max. total weight 2185 kg 
Max. front axle weight 1085 kg 
Max. rear axle weight 1100 kg 
Max. load 365 kg 
Max. trailer weight braked 1200 kg 
Max. trailer weight unbraked 750 kg 
Weight empty 1820 kg 
According to guideline DIN 70020 (with fuel, spare wheel and tool equipment) 
Operating method four-stroke Otto 
Configuration front, parallel; upright 
Type M 186 I / 186.920 
No. of cylinder/configuration 6 / in line 
Bore x stroke 85 x 88 mm 
Total displacement 2996 ccm (tax classification: 2975 ccm) 
Compression ratio 6,4 
Crankshaft bearing
Output 115 hp at 4600 /min 
Maximum torque 20 mkg at 2500 /min 
No. of valves/configuration 1 intake, 1 exhaust / overhead 
Valve operation top camshaft 
Camshaft drive duplex roller-type chain 
Mixture formation 2 downdraught carburetters Solex 40 PBJC 
Cooling water cooling / pump; 20 l water 
Lubrication pressure circulation lubrication / 6,5 l oil 
Electric system 12 V 
Battery 56 Ah / in the engine compartment 
Dynamo 150 W 
Starter motor electrical / 1,0 PS 
Ignition battery ignition 
Fuel tank in the rear / 65 l; since 02.52: 72 l 
Fuel supply diaphragm pump 
Driven whells rear wheels 
Power transmission divided cardan shaft 
Frame desing X-shaped oval tube frame with centre reinforcement / all-steel body 
Wheel suspension front double wishbone 
Wheel suspension rear oscillating swing axle 
Suspension front coil springs, torsion bar stabilizer 
Suspension rear double coil springs, electrically engageable torsion-bar suspension 
Damper hydraulic telescopic damper 
Steering worm-and-sector steering, since 1952 recirculating-ball steerg. 
Steering transm ratio 17,9:1 / 3,3 steering wheel turns, since 1952: 21,4:1 / 3,75 
Breaking system braking system 
Breaking system hydraulic, effective on front- and rear wheels ; drum brakes front and rear 
Parking breake parking brake 
Parking breake mechanical, effective on rear wheels 
Diamatre brake drums front / rear: 260 mm 
Wheels sheet steel-disc wheels 
Wheels rims drop centre rim 5 K x 15 
Tyres 7,00-15 extra (6 PR) 

Skrzynie biegów tego modelu (gearbox and performance):

Types 300 - 300 d (W 186, W 189)
Mercedes-Benz type 300 Cabriolet D
Gearbox 4-speed gear shift 
Availability Series 
Shifting Gear shift 
Clutch Single-plate dry clutch 
Type of gearbox Pinion change gear 
Synchromesh gears I - IV 
Gear transmission I. 3,68; II. 2,25; III. 1,42; IV. 1,0; R. 3,08 
Differential ratio 4,44 
Maximum speed 155 km/h 
Accelerations 18 s 
Comments Acceleration with shifting through from 0 - 100 km/h; loaded with 2 persons 
Fuel consumption 13,8 l 
acc. to guideline DIN 70030, ascertained at 3/4 of max. speed, maximal 110 km/h, unter Zuschlag von 10 %