Group 21 Service procedures - engine
25
Cylinder head, pressure
testing
(Cylinder head removed)
Special tools: 999 6662, 999 6997 (2 ea)
Before using the pressure testing equipment, check it for ac-
curacy.
1
Connect the pressure testing equipment 999 6662 to an air
supply and set the gauge to 100 kPa (14.5 psi) by means of
the reduction valve.
Note: The knob of the reduction valve can be locked with a
circlip, which is moved in an axial direction.
2
Then close the bleed valve. The pressure gauge dial pointer
must not drop during minutes, otherwise the gauge cannot
be relied upon.
3
Fit 999 6997 (two) to the cylinder head.
Note: Tighten the wing nuts with care so as not do damage
the rubber gaskets of the tool.
4
Connect the hose between 999 6662 and 999 6997.
5
Check that the knob on 999 6662 is fully opened.
6
Put the cylinder head into a 70°C (158°F) water bath.
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