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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

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

Bore
4.13 in, 105 mm

Stroke
5.0 in, 127 mm

CAT C4.4, C6.6 Arrangement

C4.4
4 Cyl In-Line, turbo, aftercooled 

C6.6
6 Cyl In-Line, turbo, aftercooled 

CAT C4.4, C6.6 Power

C4.4
59-136 kW, 79-183 hp
@2200-2500 rpm

C6.6
89-205 kW, 119-275 hp
@2200-2500 rpm


CAT C6.6 Dimensions
approx
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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