CITROEN C4 2004 Handbook page 213

CHECKING THE ENGINE COMPRESSION RATES
Engines: 9HX - 9HY - 9HZ
Checks (continued).
Remove tool [1] from tool [2].
Remove the tool [2] from cylinder N°1.
Apply the same method to cylinders N°2, N°3 and N°4.
NOTE: The difference between any two cylinders should not be greater than 5 Bars.
Disconnect the battery.
WARNING: If the pressure values are low, check the condition of the air filter and of the cylinder
head gasket before thinking of any engine overhaul.
Additional operations.
Refit the preheater plugs, tighten to 1 ± 0,1 m.daN.
Complete the refitting in the opposite order to removal.
IMPERATIVE: Carry out the operations that are necessary following a reconnection of the
battery (see corresponding operation).
B1CPOF5D
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