Crankshaft Inspection: Inspection
How to use this service information .
- Out-of-Round and Taper - Inspect
Preconditions
Procedure/Specifications
1. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.
2. Check the keyway slot and the threaded holes.
3. Measure the out-of-round at the middle of each rod and main journal in two places, and check the difference. Normal conditions: The difference between measurements on each journal must not be more than the service limit.
Journal Out-of-Round
Standard Value (New) Service Limit a1, b1 0.004 mm (0.00016 in) max. 0.010 mm (0.00039 in) 4. Measure the taper at the edges of each rod and the main journal. The difference between measurements on each journal must not be more than the service limit. Normal conditions: The difference between measurements on each journal must not be more than the service limit.
Journal Taper
Standard Value (New) Service Limit a, b 0.005 mm (0.00020 in) max. 0.010 mm (0.00039 in) Result
- If the measurement is not within specifications, replace the crankshaft.
- Straightness - Inspect
Preconditions
Procedure/Specifications
1. Place the V-blocks on a flat surface.
2. Check the total runout.
Tool Details
Name a Dial Indicator b V- Block (Commercially Available) 3. Measure the runout on all of the main journals. Rotate the crankshaft two complete revolutions. Normal conditions: The difference between measurements on each journal must not be more than the service limit.
Crankshaft Total Runout
Standard Value (New) 0.03 mm (0.0012 in) max. Result
- If the measurement is not within specifications, replace the crankshaft.