Mercedes M198 Petrol Engine Manuals
The Mercedes-Benz M198 Petrol Engine is a 3.0 L overhead cam straight-six with Bosch mechanical direct fuel injection and dry sump lubrication, produced from 1954-1964
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Download: Mercedes Benz M198 Engine Service Manual
Mercedes
M198 Engine Repair Manual
Download: 25.9mb, 144 pages, .pdf
Variations: M194 M198 198.980 198.982
Application: W194 W198
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Multi Unit Engine Manual Applications M194 M198
M198 Engine Technical Data
The 300SL gullwing coupé and its roadster counterpart featured the M198 Bosch mechanical direct injected high-performance dry sump version of the M186 engine which made its debut in 1954. It produced 215 PS (158 kW; 212 hp) DIN net at 5,800 rpm and 275 Nm (203 lb-ft) DIN net of torque at 4,600 rpm and though another source cites power as 223 PS (164 kW; 220 hp), and 243 PS (179 kW; 240 hp) with an optional high-performance "Sport" camshaft, the only configuration available for the roadster.
The M198 engine was first produced as a Coupe from 1954 to 1957 with gullwing doors and then from 1957 to 1963 for the 300SL Roadster. The 300 refers to its M198 engine displacement of 3.0 liter or more specifically 2,996 cc (182.8 cu in).
Like the W194, the 300 SL borrowed the basic M186 engine from the four-door 300 (W186 "Adenauer"). It featured an innovative diagonal SOHC aluminum head, big valves, generous 2.6 gallon oil capacity, and came with the latest Bosch first mechanical direct fuel injection system originally designed for Daimler-Benz's liquid-cooled inverted V12. Compression was set at 8.55: 1 for the Coupe and 9.5:1 for the Roadster. The M198 3.0 was connected four-speed, and performed well at 220 hp (164 kW).
M198 Versions and Applications
| Version | Disp. | Bore & Stroke | Comp. | Power | Torque |
|---|---|---|---|---|---|
| 198.980 | 2996cc | 85 x 88 mm | 8.55 | 164 kW (220 hp) at 5800 rpm | 206 lb-ft at 4900 rpm |
| 198.982 | 2996cc | 85 x 88 mm | 8.55 | 179 kW (240 hp) at 6100 rpm | 217 lb-ft at 4800 rpm |
Applications and Production Statistics
- ENGINE: 2,996cc SOHC Bosch mechanical fuel-injected, with dry-sump lubrication
- HORSEPOWER: 240 at 6,100 rpm, TORQUE: 217 lb-ft at 4,800 rpm
- LENGTH: 178 in., CURB WEIGHT: 2,849 lb, FUEL EFFICIENCY: 15-20 mpg
- ACCELERATION: Zero-60 mph 8-9 sec., TOP SPEED: 146 mph
| W198 300SL Coupe | ||||
| Type | Chassis | Engine | Years | # Built |
|---|---|---|---|---|
| Coupe Production | 198.040 | 198.980 | 1954-57 | 1,371 |
| Coupe Aluminum | 198.043 | 198.980 | 1955-56 | 29 |
| W198 300SL Roadster | ||||
| Type | Chassis | Engine | Years | # Built |
| Roadster | 198.042 | 198.980 | 1957-61 | below |
| Roadster | 198.042 | 198.982 | 1962-64 | 1,858 |
Engines Covered in this Multi Unit Manual
