37. Engine Block Clean and Inspect

Visual Inspection





1. Inspect all threaded holes for damage or excessive debris.
2. Inspect the cylinder block for cracks in the cylinder walls, the coolant jackets and the crankshaft bearing webs.
3. It cracks are found, the cylinder block must be replaced.

Cleaning Procedure
1. Clean all gasket surfaces, the oil passages, the coolant passages and the engine block with solvent.
2. Clean all threaded holes with solvent and compressed air. Remove any old thread sealant material.

Measuring Cylinder Bore Diameter
1. Measure the cylinder bore diameter 37 mm (1.47 inch) from the deck face using a cylinder bore micrometer.
2. Compare your results with the Engine Mechanical Specifications. If the cylinder diameter exceeds the specifications, the cylinder block must be replaced. There are no oversized pistons and rings available for service.

Measuring Cylinder Bore Taper
1. Measure the cylinder bore along the thrust surfaces (perpendicular to the crankshaft centerline) at 5 mm (0.20 inch) below the deck surface and record your measurement.
2. Measure the cylinder bore along the thrust surfaces (perpendicular to the crankshaft centerline) at 102 mm (4 inch) below the deck surface and record your measurement.
3. Calculate the difference between the two measurements. The result will be the cylinder taper.
4. Compare your results with the Engine Mechanical Specifications. If the cylinders exceed the specifications, replace the cylinder block. There are no oversized pistons and rings available for service.

Measuring Cylinder Bore Out-of-Round
1. Measure both the thrust and non-thrust cylinder diameter 5 mm (0.2 inch) below the deck. Record your measurements.
2. Calculate the difference between the two measurements. The result will indicate out-of-round at the upper end of the cylinder.
3. Measure both the thrust and non-thrust cylinder diameter at 102 mm (4 inch) below the deck surface. Record your measurements.
4. Calculate the difference between the two measurements. The result will indicate out-of-round at the lower end of the cylinder.
5. Compare your results with the Engine Mechanical Specifications. If the cylinders exceed these specifications, replace the cylinder block. There are no oversized pistons and rings available for service.