C3.3B Tier 4 Interim and EU Stage 3A Engines for Caterpillar Built Machines – Cylinder Block

Note: Apply engine oil to the threads of the crankcase bolts prior to assembly.

Table 1
Tightening torque	Crankcase bolts A thru J	C2.6 - 128 to 137 N·m (94 to 101 lb ft) C3.3B - 138 to 147 N·m (102 to 108 lb ft)
Tightening torque	Crankcase bolts K thru Z	C2.6 - 49 to 55 N·m (36 to 41 lb ft) C3.3B - 59 to 63 N·m (44 to 46 lb ft)

Cylinder Wear

Measure the inside diameter of the cylinder at the six positions with a cylinder gauge to find the maximum and minimum inside diameters.




Illustration 3	g03009976
(A) Top (B) Middle (C) Bottom (a) Right-angled to piston pin (b) Piston pin direction

Get the difference (Maximum wear) between the maximum and the minimum inside diameters.

Table 2
Cylinder bore inside diameter	New	C2.6 - 87.000 to 87.022 mm (3.42519 to 3.42606 inch) C3.3B - 94.000 to 94.022 mm (3.7008 to 3.7016 inch)
Cylinder bore inside diameter	Allowable limit	C2.6 - 87.15 mm (3.431 inch) C3.3B - 94.15 mm (3.707 inch)

If the wear exceeds the allowable limit, bore and hone to the oversize dimension.

Visually check the cylinder wall for scratches. If deep scratches are found, the cylinder should be bored.




Illustration 4	g03010138
(1) Cylinder Inside Diameter (Before Correction) (2) Oversize Dimension

When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension.

Table 3
Cylinder inside diameter (Oversize)	New	C2.6 - 87.250 to 87.272 mm (3.43503 to 3.43590 inch) C3.3B - 94.500 to 94.522 mm (3.7205 to 3.7213 inch)
Maximum wear	Allowable limit	C2.6 - 87.40 mm (3.441 inch) C3.3B - 94.65 mm (3.726 inch)
Finishing	Hone to 2.2 to 3.0 Rz (0.000087 to 0.00011 inch Rz)

Replace the piston and piston rings with oversize 0.5 mm (0.02 inch) pistons.
Note: When the oversize cylinder is worn beyond the allowable limit, replace the cylinder block with a new one.