Service Manual

Coolant Thermostat ISB, ISBe and QSB (Common Rail [...]
Page 8-12 Section 8 - Cooling System - Group 08
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Install a hose of the same size on the water outlet
connection long enough to reach a remote, dry container
used to collect coolant.
Install and tighten a hose clamp on the water outlet
connection.
Place the other end of the hose in a dry container.
Operate the engine at rated rpm for 1 minute.
Shut off the engine and measure the amount of coolant
collected in the container.
The amount of coolant collected must not be more than
100 cc [3.3 fl oz].
If more than 100 cc [3.3 fl oz] of coolant is collected, the
thermostat is leaking and must be replaced.