C3.3B Tier 4 Final Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g02974177
(1) Crankcase Bolts (2) Crankcase 2

1. Using the surface that touches the flywheel housing as a reference, line up crankcases 1 and 2.

2. Temporarily bolt in the crankcase 2 mounting bolts.

3. Get the difference in the levels of crankcases 1 and 2 to as little as possible. The gap must be 0.5 mm (0.02 inch) less.

Illustration 2	g03361227

Cylinder

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Illustration 3	g02915160

1. Measure the inside diameter of the cylinder at the six positions with a cylinder gauge and find the maximum and minimum inner diameters.
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   Table 2

   Cylinder Bore inside diameter	Factory specification	94 mm (3.70078 inch) to 94.022 mm (3.70165 inch)
   	Allowable limit	94.15 mm (3.707 inch)

2. Find the difference between the maximum and the minimum inner diameters.

3. If the maximum inside diameter or the difference is more than the allowable limit, bore and hone to the oversized dimension.

Cylinder Correction (Oversize)

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Illustration 4	g02915197
(1) Cylinder Inside Diameter (Before Correction) (2) Cylinder Inside Diameter (Oversize)

1. If the cylinder wear is more than the allowable limit, bore and hone to the specified dimension.
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   Table 3

   Oversize cylinder inside diameter	Factory specification	94.5 mm (3.72047 inch) to 94.522 mm (3.7213 inch)
   Maximum wear	Allowable limit	94.65 mm (3.726 inch)
   Finishing	Hone to 0.000087 to 0.00011 inch Rz

2. Replace the piston and piston rings with oversize ones (0.5 mm 0.02 inch).

3. If the maximum inside diameter or the difference for the oversize cylinder is more than the allowable limit, replace the cylinder block.

Cylinder Block Flatness

1. Clean the cylinder block surface.
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   Illustration 5	g02908237

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   Illustration 6	g02908396

2. Place a straightedge on the cylinder block's four sides “A”, “B”, “C” and “D” and two diagonal “E” and “F” as shown in the figure. Measure the clearance with a feeler gauge.
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   Table 4

   Cylinder block flatness

   Allowable limit

   0.05 mm 0.002 inch

3. If the measurement exceeds the allowable limit, correct the cylinder head with a surface grinder.

   Note: Be sure to check the valve recessing after correcting.