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CATERPILLAR C4.4, C6.6 Essential Diesel Engine Bolt Tightening Torques


CAT C4.4, C6.6 Main Bearing Bolts
Step 1 = 80 Nm, 59 lb.ft Step 2 = + 90 degrees

CAT C4.4, C6.6 Connecting Rod Bolts
Step 1 = 18 Nm, 13 lb.ft Step 2 = 70 Nm, 52 lb.ft Step 3 = + 120 degrees

CAT C4.4, C6.6 Cylinder Head Bolts
Step 1 = 50 Nm, 37 lb.ft Step 2 = 100 Nm, 74 lb.ft Step 3 = +225 degrees

CAT C6.6 cylinder head bolt torque sequence
CAT C6.6 cylinder head bolt torque sequence 
Different from most other engines

CATERPILLAR C4.4 and C6.6 Diesel Engine Specs


CAT C4.4, C6.6 Displacement, bore and stroke

C4.4 approx 4.4 liter, 269 CID
C6.6 approx 6.6 liter, 403 CID

4.13 in, 105 mm

5.0 in, 127 mm

CAT C4.4, C6.6 Arrangement

4 Cyl In-Line, turbo, aftercooled 

6 Cyl In-Line, turbo, aftercooled 

CAT C4.4, C6.6 Power

59-136 kW, 79-183 hp
@2200-2500 rpm

89-205 kW, 119-275 hp
@2200-2500 rpm

CAT C6.6 Dimensions
Length 929 mm, 37 in
Width 668 mm, 27 in
Height 797 mm 32 in

CAT C6.6 Weight
approx dry
1115 lb
506 kg

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