Perkins 403C-11, Workshop Manual, Page: 57 / 128

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Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green 47
400 Series
Crankshaft
To inspect for deflection Operation 5-3
1 Support the crankshaft on V-blocks.
2 Position a dial gauge on the crankshaft centre journal, and turn the crankshaft gradually by one full turn.
3 If the gauge reading is more than the service limit, renew or regrind the crankshaft.
4 When the measured diameter is less than the service limit, regrind and use undersized bearings and bushes.
Crankshaft inspection
1 Check the oil seal contact face for damage or wear.
2 Check oil holes for clogging.
3 Check crankshaft journal (A4) and crank pin (A3) for stepped wear. Take measurements of diameters (A5-
A5) and (A6-A6) at positions (A1) and (A2). If the maximum difference between the measurements (stepped
wear) is more than the service limit of 0,05 mm (0.0019 in) then correction is required.
Grinding specification
When grinding the crankshaft, work with the following specifications:
Note: Use No. 400 emery cloth for final polishing.
Engine Deflection mm (in)
Standard Service limit
All models 0,03 or less (0.011) 0,06 (0.0023)
Radius at pin / journal (B1) 3 mm (0.118 in) ± 0,2 mm (± 0.0078 in)
Finish precision (B2) 1.6Z (
∇ ∇
▼
)
Radius around oil hole (B3) 2 mm (0.787 in) maximum / 5 mm (0.196 in) minimum
B
1
2 3
A
3
4
1 2
1 2
5
5
6
6
H1064