Crankshaft: Testing and Inspection
CleaningCAUTION: Handle the crankshaft with care to avoid possible damage to the finished surfaces.
Clean the crankshaft with solvent. Blow out all oil passages with compressed air.
Inspection
Inspect the main and connecting rod journals for cracks, scratches, grooves, scores or rough finish. Inspect the crankshaft rear oil seal and crankshaft front oil seal surface for nicks, sharp edges, or burrs that might damage the crankshaft rear oil seal and crankshaft front oil seal during installation or cause premature crankshaft rear oil seal and crankshaft front oil seal wear.
Crankshaft Runout
Set the crankshaft on V-blocks and use Dial Indicator with Bracketry TOOL-42O1-C or equivalent to measure the crankshaft runout.
Maximum crankshaft runout is 0.03 mm (0.0012 inch). If the crankshaft runout exceeds specification, replace the crankshaft
Crankshaft End Play
1. Push crankshaft toward rear of engine.
2. Install Dial Indicator with Bracketry TOOL-42O1-C or equivalent so stylus contact point rests against crankshaft flange and indicator center axis is parallel to crankshaft center axis.
3. Zero dial indicator. Push crankshaft forward and note reading on dial.
4. If the end play exceeds the wear limit specification listed in Specifications, replace the crankshaft thrust main bearing. Inspect the crankshaft for damage to the thrust face before installing the new crankshaft thrust main bearing. If the end play is less than the minimum limit, inspect the thrust bearing faces for scratches, burrs, nicks, or dirt. If the thrust faces are not damaged or dirty, they probably were not aligned properly. Lubricate and install the crankshaft thrust main bearing and align the faces.
Crankshaft Main Journal and Connecting Rod Journals
Inspect the main journal and connecting rod journal diameters. Measure the diameter of each journal at two different points in the directions as shown.
If a main journal or connecting rod journal is less than specifications as outlined Specifications, grind the journal to match an undersize bearing.
Measure the crankshaft bore diameter in the cylinder block in five directions, using a suitable bore gauge following the manufacturer's instructions. If the crankshaft bore diameter out-of-round exceeds the specifications as outlined Specifications, replace the cylinder block.
Journals, Refinishing
Dress minor imperfections such as scores, nicks or burrs with an oil stone. If the journals are severely marred or exceed the service limit, they should be refinished to size for the next undersize bearing.
If required, machine the journals to give the proper clearance with the next undersize bearing. If the journals will not clean up to maximum undersize bearing available, replace the crankshaft.
Always reproduce the same journal shoulder radius which existed originally. Too small a radius will result in fatigue failure of the crankshaft. Too large a radius will result in bearing failure due to radius ride of the bearing.
After refinishing the journals, chamfer the oil holes. Polish the journal with a No. 500 grit polishing cloth and engine oil (crocus cloth may also be used as a polishing agent) to obtain a smooth finish. Remove all grinding dust from oil passages with compressed air.
Crankshaft Sprocket
CAUTION: Handle crankshaft sprocket with care to avoid possible damage to the finished surfaces.
Inspect crankshaft sprocket for nicks, burrs or roughness that would cause premature wear. If crankshaft sprocket is worn or damaged, replace crankshaft sprocket.