3003, 3013, 3014 and 3024 Engines for Caterpillar Built Machines Caterpillar

• The distortion of the connecting rod

• The parallel alignment of the bores of the connecting rod

• Conformance to specifications and clearances

Distortion of Connecting Rod

Illustration 1	g00690891
Measure the Connecting Rod for Distortion and Parallelism. (1) Measuring pins (2) Connecting rod (A) 100 mm (3.9 inch) (B) The distortion of the connecting rod should be less than 0.08 mm (0.003 inch). The connecting rod should be parallel within 0.05 mm (0.002 inch).

1. Use the following tools that are provided by the customer in order to measure distortion and parallelism for connecting rod (2) :
   • Appropriate gauges for measuring distance

   • Measuring pins (1)

2. Measure the length of the connecting rod between the centers of measuring pins (1) .

3. Measure the connecting rod for distortion between the bores.

   The bores for the crankshaft bearing and the bearing for the piston pin must be square and parallel with each other within the required limits.

   The limits are measured at a distance of 100 mm (3.9 inch) (A) from each side of connecting rod (2) .

   When the bearings for the connecting rod are removed from the connecting rod, the limit for parallelism is ± 0.15 mm (± 0.006 inch).

   The limit for distortion is ± 0.20 mm (± 0.008 inch).

Inspect the Bearings and Piston Pin for Wear

1. Inspect the piston pin and the bearing for the piston pin for wear. Measure the dimensions of the bearing and the piston pin.

   If the bearing or the piston pin are not within tolerances, the component must be replaced.

   Refer to the Specifications Module, "Piston and Rings" for dimensions.

2. Measure the clearance of the piston pin in the bearing for the piston pin.

   If the clearance between the bearing and piston pin is not within the tolerance, one or both components must be replaced.

   Refer to the Specifications Module, "Connecting Rod" for dimensions.

3. Measure the axial clearance between the connecting rod and the crankshaft.

   If the axial clearance between the connecting rod and the crankshaft is not within the tolerance, one or both components must be replaced.

   Refer to the Specifications Module, "Crankshaft" for dimensions.

4. Measure the clearance between the connecting rod journal on the crankshaft and the connecting rod bearing. Use plastigage to measure the clearance.

   If the clearance between the connecting rod and the crankshaft is not within the tolerance, one or both components must be replaced.

   Refer to the Specifications Module, "Crankshaft" for appropriate clearances.