Mack E7 Manuals, Engine Specifications & Bolt Torques

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Mack E7
Connecting Rod Nuts

60-65 lb.ft, 82-88 Nm

Mack E7
Main Bearing Bolts

115-125 lb.ft, 156-170 Nm

Mack E7 Engine
Cylinder Head Bolts

Step 1 = 90 lb.ft, 122 Nm
Step 2 = 100 lb.ft, 136 Nm
Final step = 110 lb.ft, 150 Nm

Mack E7 Engine
Bore, Stroke, Displacement
Compression Ratio and Weight

Bore
4.875 inches 123.83 mm

Stroke
6.5 inches 165.1 mm

Displacement
728 CID, 12.0 liter

Compression Ratio
up 375 hp = 16.5:1
above 375 hp = 15.3:1

Weight
2210 lb, 1003 kg

Mack E7 Engine
Power and Torque

Power
E7-250: 250 hp, 186 kW @1950 rpm
E7-350: 350 hp, 261 kW @1800 rpm
E7-460: 460 hp, 343 kW @1950 rpm

Torque
E7-250: 975 lb.ft, 1306 Nm @1200 rpm
E7-350: 1277 lb.ft, 1711 Nm @1250 rpm
E7-460: 1660 lb.ft, 2224 Nm @1200 rpm