To Check And Adjust The Operation Of The Waste-Gate - Perkins New 1000 Series Workshop Manual

New 1000 Series
To check and adjust the operation of
the waste-gate
If the waste-gate valve does not operate at the correct
pressure, it can affect the engine performance.
If the valve opens at a low pressure, this can cause
black exhaust smoke and loss of power at lower
engine speeds.
Caution: A high pressure setting can cause high
cylinder pressures. This can cause failure of the
cylinder head gasket and damage to the bearings and
pistons.
1 Disconnect the boost sensor pipe (A6) at the
actuator. Connect to the actuator an air supply which
can be adjusted accurately and is fitted with an
accurate gauge.
2 Fasten a dial test indicator (A1) to the turbocharger
with its plunger in contact with the end of the actuator
rod (A4) to measure the axial movement of the rod.
3 Slowly apply air pressure. Check that the pressure
necessary to move the rod 1,00 mm (0.039 in), is
within the limits shown in the data and dimensions at
the end of this section. Ensure that the pointer returns
to zero when the pressure is released. Repeat the test
several times to ensure that an accurate reading is
obtained. It may be necessary to lightly hit the turbine
housing with a soft hammer during the test operation.
4 If the operation of the waste-gate is not correct, the
actuator rod can be adjusted.
5 Remove the dial gauge from the end of the actuator
rod.
6 With the air pressure still applied, release the lock
nut (A5) on the actuator arm. Remove the clip (A2)
and remove the actuator rod from the pin (A3) on the
arm of the waste-gate valve.
7 If the air pressure is too low, rotate the end of the
actuator rod to reduce the length of the actuator rod.
If the air pressure is too high, rotate the end of the
actuator rod to increase the length of the actuator rod.
Rotate the end of the actuator rod in half-turn
increments.
Caution: Use only the end of the threaded rod to
make adjustments. To pull or push the actuator rod
could change the calibration of the actuator. The
result could be damage to the engine because of too
much boost.
8 Put the actuator rod in position on the pin of the
waste-gate arm. Fit the clip. Tighten the lock nut.
Release the air pressure.
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9 Put the dial gauge in position on the end of the
actuator rod. Apply air pressure to move the actuator
rod 1,00 mm (0.039 in) and check if the air pressure
is correct. If the air pressure is not correct, repeat from
paragraph 6 of the operation until the correct pressure
is obtained.
10 If the air pressure is correct, release the air
pressure, remove the test equipment and connect the
boost sensor pipe.
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