SENR9977 51 Testing and Adjusting Section i01748770 Connecting Rod Bearings - Inspect Check the connecting rod bearings and the connecting rod bearing journal for wear or other damage. Connecting rod bearings are available with a smaller inside diameter than the original size bearings. These bearings are for crankshafts that have been ground. g00927038 Illustration 57 Inspection of the connecting rod parallel alignment. (1) Measuring pins (2) Connecting rod (L) Measure the distance between the center of the bore for the piston pin bearing and the center of the connecting rod bearing bore. (K) Measure the distance 127 mm (5.0 inch) from the connecting rod.
i01748792 Main Bearings - Inspect Check the main bearings for wear or other damage. Replace both halves of the bearings and check the condition of the other bearings if a main bearing is worn or damaged. 1. Use the appropriate tools in order to measure the distances for the connecting rod (2). Appropriate gauges for measuring distance Main bearings are available with a smaller inside diameter than the original size bearings. These bearings are for main bearing journals that have been ground. Measuring pins (1) Note: The connecting rod bearings should be removed before taking the measurements. i01946424 Cylinder Block - Inspect 2.
Measure the connecting rod for distortion and parallel alignment between the bores. The measurements must be taken at distance (K). Distance (K) has a value of 127 mm (5.0 inch) from both sides of the connecting rod. 1. Clean all of the coolant passages and the oil passages. Measure length (L). 2. Check the cylinder block for cracks and damage. The total difference in measurements of length (L) from each side should not vary more than ± 0.25 mm (± 0.010 inch). 3. The top deck of the cylinder block must not be machined. This will affect the piston height above the cylinder block. If the piston pin bearing is not removed, the limits are reduced to ± 0.06 mm (± 0.0025 inch). 4.
Check the camshaft bearing for wear. If a new bearing is needed, use a suitable adapter to press the bearing out of the bore. Ensure that the oil hole in the new bearing faces the front of the block. The oil hole in the bearing must be aligned with the oil hole in the cylinder block. The bearing must be aligned with the face of the recess. Refer to Disassembly and Assembly, “Camshaft Bearings - Remove and Install”. 3. Inspect the piston pin bearing and the piston pin for wear and other damage. 4. Measure the clearance of the piston pin in the piston pin bearing. Refer to Specifications, “Connecting Rod” for clearance dimensions.