16 PC800, 850-8
SEN00786-02 30 Testing and adjusting
Testing fuel return rate and leakage
a If the engine has the intake manifold equipped
with the return block on it to return the fuel spill-
ing from the injector to the fuel tank, test the fuel
return rate and fuel leakage according to the fol-
lowing procedure.
a Testing tools for fuel return rate and leakage
a Prepare an oil pan of about 20 l to receive the
fuel flowing out during the test.
1. Preparation work
1) Remove tube (3) between common rail (1)
and supply pump (2).
2) Insert spacer J1 on supply pump (2) side
and tighten the removed joint bolt again.
a Connect the return pipe to the fuel tank
again, too.
a Be sure to fit the gaskets to both ends of
the spacer.
3) Insert joint J2 on common rail (1) side and
tighten the removed joint bolt again.
a Be sure to fit the gaskets to both ends of
the joint.
Symbol Part No. Part name
J
1 6151-51-8490 Spacer
2 6206-71-1770 Joint
3 6217-71-8820 Joint
4
Commercially
available
Hose (5 mm x 2 – 3 m)
5
Commercially
available
Hose (15 mm x 2 – 3 m)
6
Commercially
available
Measuring cylinder (2 l)
7
Commercially
available
Stopwatch
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