DAF CF65, Service Manual

Page: 86 / 352

CE ENGINE FUEL SYSTEM
4-8
©
200416
Inspection and adjustment
2
ΧΦ65/75/85
series
4
4.4 INSPECTION, INTERNAL FUEL LEAKS
When inspecting for internal fuel
leaks, fuel will escape. Collect the
fuel and avoid the risk of fire.
Dirt in the fuel system can lead to
significant damage to parts of the
system. All open connections must
therefore be sealed.
The common rail system is under
high pressure when the engine is
running. This pressure can rise to
approx. 1400 bar. Even when the
engine is not running, there may be
a high residual pressure in the fuel
rail (approx. 50 bar). Depressurise
the system before working on the
common rail system by wrapping the
coupling in a cloth and then
unscrewing it and collecting the
escaping fuel in a container.
Inspection, internal fuel leaks
1. Check that all injector pipes have been
tightened to the correct torque and that there
are no external signs of fuel leakage; see
"Technical data".
2. Disconnect the fuel return pipe (1) from the
fuel return overflow valve (2) on the rear of
the cylinder head.
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