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

Illustration 1	g03363945
(1) Rocker arm (2) Rocker arm shaft (3) Bridge arm

Oil Clearance between Rocker Arm and Rocker Arm Shaft

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Illustration 2	g02914366

1. Measure the rocker arm I.D. with an internal micrometer.

2. Measure the rocker arm shaft O.D. with an external micrometer. Calculate the oil clearance.
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   Table 2

   Oil clearance between rocker arm and rocker arm shaft	Factory specification	0.016 mm (0.00063 inch) to 0.054 mm (0.00213 inch)
   	Allowable limit	0.15 mm (0.0059 inch)

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   Table 3

   Rocker arm shaft outside diameter	Factory specification	14.973 mm (0.58949 inch) to 14.984 mm (0.58992 inch)
   Rocker arm inside diameter	Factory specification	15 mm (0.59055 inch) to 15.027 mm (0.59161 inch)

Push Rod Alignment

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Illustration 3	g02914367

1. Put the push rod on V blocks.

2. Measure the push rod alignment.
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   Table 4

   Push rod alignment

   Allowable limit

   0.25 mm (0.0099 inch)

3. If the measurement is more than the allowable limit, replace the push rod.

Valve Bridge Arm