Service procedures - cooling system Group 22
148
5
Tighten the lock ring for the knob on the relief valve. In-
crease the pressure by tightening the knob until the pressure
gauge reads 70 kPa (10.15 psi).Lock the knob by pressing
in the lock ring and close the cock (B).
6
Check during one minute that the pressure does not drop. If
there is difficulty in locating the leak, drain the coolant, re-
pressurize the system and apply soapy water to hose con-
nections, drain cocks etc., until the leak is found.
Notice: Make sure that the pressure never exceeds 70 kPa
(10.15 psi. Check that the pressure does not rise. Increased
pressure can, among other things, damage the coolant pump
seal.
Note: Always follow applicable safety regulations.
7
Remove the testing device.
Pressure valve, checking
The pressure valve is located in the filler cap. For this test
the same pressure-testing device is used as for testing for
leakage in the cooling system. See previous section.
1
Drain part of the coolant and connect the pressure- testing
device with a nipple to any plugged hole in the cooling sys-
tem.
2
Extend the draining hose from the filler pipe with a hose
which opens out into a vessel containing water.
3
Apply the pressure, see “The cooling system “Pressure test-
ing”, in the previous section, and read the pressure gauge
when the valve opens (water will bubble in the vessel with
the drain line/filler cap).
For correct opening pressure, see “Workshop manual,
Technical Data).
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