History
Mercedes-Benz M 129 petrol engine
| Mercedes Benz | |
|---|---|
 |
|
| M 129 | |
| Manufacturer: | Daimler Benz |
| Production period: | 1965-1968 |
| Style: | Six-cylinder - inline engine |
| Combustion principle: | gasoline engine |
| Previous model: | Mercedes-Benz M127 |
| Successor: | Mercedes-Benz M 130 |
The Mercedes-Benz M 129 was a 1965 to 1969 of Daimler-Benz -made six-cylinder - inline engine with intake manifold injection and 2.5 liters displacement . It was the injection version of the simultaneously produced carburettor engine M 108 .
With intake manifold injection and the increased compression ratio (increase from 9: 1 to 9.3: 1 or 9.5: 1 from 1966) this achieved a significant increase in performance compared to the carburetor model. Otherwise, the unit remained essentially unchanged.
Technical data
- Six - cylinder inline engine ; Engine block from cast iron ; Cylinder head made of aluminum alloy
- Crankshaft with seven main bearings
- OHC valve control : a camshaft in the cylinder head; two valves per cylinder
- Intake manifold injection via mechanical Bosch 6-piston injection pump with map control
- Bore x stroke : 82 mm × 78.8 mm
- Displacement : 2496 cc
- Compression ratio : 9.3: 1 (9.5: 1 of 1966);
- Performance: 150 hp at 5500 rpm
- Torque: 216 Nm at 4200 rpm
Use
- Mercedes-Benz W111 250SE Coupe / Cabriolet (1965-67).
- Mercedes-Benz 250SE W108 (1965-68).
- Mercedes-Benz 250 SL "Pagoda SL" (1966-68).
Technical
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Mercedes M 129 engine Technical details and specifications (1965-1968)
Engine front, 4 stroke
cylinders: 6, vertical, in line
bore and stroke: 3.23 x 3.10 in, 82 x 78.8 mm
engine capacity: 152.31 cu in, 2,496 cu cm
compression ratio: 9.5
max power (SAE): 170 hp at 5,600 rpm
max torque (SAE): 174 1b ft, 24 kg m at ,500 rpm
max engine rpm: 6,300
specific power: 68.1 hp/l
cylinder block: cast
cylinder head: light alloy
crankshaft bearings: 7
valves: 2 per cylinder, over- head, in line, finger levers
camshafts: 1, overhead
carburation: 6-cylinder Bosch intermittent injection pump inlet
fuel feed: electric pump
cooling system: water automatic fan
voltage: 12 V
battery: 55 Ah
generator type: alternator, 490 W
ignition distributor: Bosch
FUEL CONSUMPTION 24.1 m/imp gal, 20.1 m/US gal, 11.7 1 x 100 km© Motor car History
Service
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Mercedes M 129 engine Service Guide (1965-1968)
fuel: 96 oct petrol;
Engine sump oil: 9.68 imp pt. 11.63 US pt. 5.5 1, SAE 20W-20, change every 3,700 miles, 6,000 km
gearboi oil:2.46 imp pt, 2.96 US pt. 1.4 1, ATF, change every 12,400 miles, 20,000 km
final drive oil: 4.40 imp, pt, 5.28 US pt, 2.5 1, SAE 90, change every 12,400 miles, 20,000 km
greasing: every 3,100 miles, 5,000 km, 20 points
cooling system capacity: 20.06 imp pt, 24.10 US pt, 11.4 1.
spark plug type: 2500
tappet clearances: inlet 0.003 in, 0.08 mm, exhaust 0.007 in, 0.18 mm
valve timing: inlet opens 11° before tdc and closes 53° after bdc, exhaust opens 47° before bdc and closes 21° after tdc
normal tyre pressure: front 23 psi, 1.6 atm, rear 27 psi, 1.9 atm.© Motor car History
