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Group 22 Lubrication System
142
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Inspecting the safety valve
1. Check the valve spring of the oil pump safety
valve for fatigue. If excessive fatigue, wear or
break is found, replace the valve spring.
2. Measure the valve opening pressure. If the pres-
sure is higher or lower than the assembly stan-
dard, increase or decrease the thickness of shim
inserted between the spring and spring cap nut.
For the thickness of a shim, 1 mm [0.04 in.] cor-
responds to a change in pressure of 0.10 MPa (1
2
kgf/cm
) [14.2 psi].
Safety valve opening press., MPa (kgf/cm
Assembly Standard ... 1.27±0.13 (13±1.3 ) [185±18.5]
Safety valve spring set length/set force, mm/N
(in/kgf) [lbf]
Assembly Standard ... 65.8/359 (2.59/36.6) [80.7]
Service Limit ............. 65.8/314 (2.59/32.0) [70.5]
Reassembly
Reassembly sequence
1
8
4
5
7
2
) [psi]
3
6
2
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