DAF CF65, Service Manual

Page: 88 / 352

CE ENGINE FUEL SYSTEM
4-10
©
200416
Inspection and adjustment
2
ΧΦ65/75/85
series
4
Locating internal fuel leak
1. Take the injector pipe out of cylinder 1.
2. Seal the connection of cylinder 1 on the fuel
rail using the special tool
(DAF no. 1453133). Tighten the plug to 30
Nm.
3. While the engine is idling, use a stop watch
to measure the time required to fill a
measuring beaker with 360 ml of return fuel.
See "Technical data" for the minimum time
permitted for filling the measuring beaker.
Note:
Use a measuring beaker with a mark at
360ml.
4. Remove the special tool (DAF no. 1453133)
and reconnect the injector pipe.
5. Repeat the above steps for the other
cylinders and note the values.
Note:
When the leaking cylinder has been plugged,
the quantity of return fuel will decrease and,
as a result, the time it takes to fill the
measuring beaker to 360ml will increase.
If several high values are measured, this
indicates that there may be several leaks. If
this is the case, first check the cylinders that
give the highest values and then repeat the
test.
In the example shown in the table below
there is an internal leak in the 5
rd
cylinder,
which could be caused by a leak in the fuel
supply pipe and/or a defective injector.
Example:
6. In the event of a leak, remove the fuel supply
pipe and the injector of the cylinder in
question; see "Removal and installation".
i400681
Leak test results
Blocked cylinder 1 2 3 4 5 6
Time (s) to fill to 360ml 35 36 35 37 150 38
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