Cylinder Bore Cleaning and Inspection
CLEANINGNOTE: If poor or improper cleaning procedures of the cylinder bores and/or cylinder block (6010) are followed, rusting may occur. Clean cylinder bore after any service operation such as honing or deglazing.
1. Clean the bore(s) with soap or detergent and water.
2. Then, thoroughly rinse the bore(s) with clean water to remove the soap or detergent.
3. Wipe the bore(s) with a clean lint-free cloth.
4. Finally, wipe the bore(s) with a clean cloth dipped in engine oil.
INSPECTION
Inspect For Cracks
After the cylinder block has been thoroughly cleaned check it for cracks. Inspect the cylinder block for cracks in the cylinder bores and between cylinders. If cracks are suspected that cannot be seen with the eye, there are magnetic and dye check inspection processes available through automotive machine shops. Tiny cracks not visible to the naked eye may be detected by coating the suspected area with a mixture of 25 percent kerosene and 75 percent light engine oil. Wipe the part dry and immediately apply a coating of zinc oxide dissolved in wood alcohol. Do not use rubbing alcohol as a substitute. If cracks are present, the coating will become discolored at the damaged area. Replace the cylinder block if it is cracked.
Inspect For Surface Irregularities
Check all machined surfaces for burrs, nicks, scratches and scores. Remove minor imperfections with an oil stone.
CYLINDER BORE MEASUREMENTS
NOTE: Make sure piston and cylinder block are at room temperature, approximately 21°C (70°F).
Cylinder Bore Diameter
^ Measure X and Y at the three levels shown.
^ The cylinder bore diameter is:
Standard ... 90.200 mm (3.550 inch).
Maximum .... 90.239 mm (3.552716 inch).
Check Cylinder Bore Taper
^ Subtract the cylinder bore diameters from points A and C as shown.
^ If the difference between measurements A and C exceeds the maximum taper value of 0.254 mm (0.0100 inch), rebore the cylinder bore to oversize.
Cylinder Out-Of-Round
^ Measure the cylinder bore diameters in two directions.
^ If the difference between measurements exceeds the maximum out-of-round specification, rebore the cylinder bore to oversize.
Limit .... 0.127 mm (0.00500 inch).
Piston-To-Cylinder Bore Clearance
NOTE: Use the above measurements obtained at right angles (90°) to the engine centerline when calculating the piston-to-cylinder bore clearance.
1. Measure the diameter of each cylinder bore at the top, middle and bottom with the gauge placed at right angles to the centerline of the engine.
2. Subtract the piston diameter from these measurements.
Maximum Piston to Cylinder Bore clearance: 0.012-0.026 mm (0.00047-0.00102 inch).