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Group 22 Lubrication System
144
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Inspection
Inspecting the oil filter
When you replace the paper element, sample about
500 cm
3
[30.5 in
3
.] of oil and check for metal particles.
If any metal particles are found, unfold the pleats of
element and check the color and shape of the parti-
cles trapped in the pleats to identify the cause.
Measuring relief valve pressure
1. Remove the taper plug (PT US) on the upper
side of the filter bracket, and attach a pressure
gauge.
2. Warrn up the engine until the oil temperature ris-
es to 70–90°C [158–194°F].
3. Measure oil pressure at idling speed and maxi-
mum speed.
4. If the measured oil pressure is lower than the
specified value, adjust the valve opening pres-
sure by inserting shims. For shim thickness, 5
mm [0.2 in.] corresponds to a change in pressure
of approximately 0.1 MPa (1 kgf/cm
Set pressure (max. speed), MPa (kgf/cm
Assembly Standard ... 0.49–0.64 (5.0–6.5) [71.12–92.46]
Relief valve opening pressure
Assembly Standard ... 0.50 ±0.02 (5.0±0.2) [71.10 ±2.84]
NOTE! The measured oil pressure might be above
the set pressure when oil temperature is low, but it re-
turns to the set pressure when oil temperature rises.
5. If adjustment with shims is not effective, replace
the relief valve and spring.
IMPORTANT! A dirty oil cooler will increase the
oil temperature and consequently lower the oil
pressure.
2
) [14 psi].
2
) [psi]
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