Perkins 900 Series Workshop Manual page 29

900 Series
Crankshaft overhaul
Notes:
l Induction hardened crankshafts need not be hardened after they have been machined undersize.
l Tufftrided crankshafts must be hardened again each time they are machined. If this process is not
available, they can be nitrided for 20 hours. If neither process is available, a new crankshaft, or Power
Exchange crankshaft, must be fitted.
l Check the crankshaft for cracks before and after it is ground.
l Demagnetise the crankshaft after it has been checked for cracks.
l After the crankshaft has been machined remove any sharp corners from the lubricating oil holes.
l Surface finish and fillet radii must be maintained.
The finished sizes for corrected crankshafts (A) are given in the table below:
0,25 mm (0.010 in)
Item
69,56/69,58 mm
A
(2.7385/2.7393 in)
56,86/56,88 mm
B
(2.2384/2.2392 in)
C .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 31,184 mm (1.22775 in) maximum
D .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... . 40,00 mm (1.575 in) maximum
E .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... . 47,27 mm (1.861 in) maximum
F .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 35,64/36,643 mm (1.403/1.443 in)
R1, all journals. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 2,38/2,78 mm (0.0937/0.1093 in)
R2, all crankpins .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 3,97/4,36 mm (0.1562/0.1718 in)
Finished surface of journals and crankpins . ... ... ... ... ... ... ... ... ... ... ... ... ... . 0,40 microns (16 micro inches)
Fillet radii, centre line average maximum ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1.3 microns (50 micro inches)
Crankshaft palm (A1) minimum diameter ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 133,17 mm (5.243 in)
A
Notes:
l The end of the crankshaft palm must not be ground. This will ensure that a spigot 4,8 mm (0.19 in) remains
for location of the flywheel.
l Remove the minimum material to remove the wear marks.
l Magnetic crack detection DC Current- 2 amps, AC current - 1300 amps
Workshop Manual, TPD 1345E, issue 3
This document has been printed from SPI². Not for Resale
Undersize
F D C
B
R2
A A
R1
R1
0,51 mm (0.020 in)
Undersize
69,30/69,32 mm
(2.7285/2.7293 in)
56,60/56,62 mm
(2.2284/2.2292 in)
C E
R2 R2
A A
B B
R1
R1
D D
2
0,76 mm (0.030 in)
Undersize
69,05/69,07 mm
(2.7185/2.7193 in)
56,35/56,37 mm
(2.2184/2.2912 in)
1
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