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68
Maintenance Section
Engine Valve Lash and Bridge - Adjust
4. Rotate the engine to align one teeth to the tapped
hole. By hand, install the sensor. When light
contact is made with the teeth, you must stop.
Unscrew the sensor half of one turn. This will give
a clearance of 0.5 to 0.8 mm (0.02 to 0.03 inch).
5. Tighten the locknut. Do not allow the sensor to
rotate. Connect the connection (3).
6. Remove tooling (A).
Timing Sensor
The timing sensor is a hall effect sensor that is
located in the gear case.
1. Remove the connection for the timing sensor (not
shown). Loosen the locknut (1).
Illustration 50
Typical example
2. Remove the sensor (2). Clean any debris from the
sensor.
3. Install tooling (A).
4. Screw in the timing sensor by hand until light
contact is made with the timing disc. Unscrew the
sensor. Unscrew one complete turn to give a
clearance of 1 mm (0.04 inch).
5. Tighten the locknut. Do not allow the sensor to
rotate. Connect the connection for the timing
sensor.
6. Remove tooling (A).
Connect the power to the engine.
Engine Valve Lash and Bridge
- Adjust
(Valves and Valve Bridges)
Ensure that the engine cannot be started while
this maintenance is being performed. To help pre-
vent possible injury, do not use the starting motor
to turn the flywheel.
Hot engine components can cause burns. Allow
additional time for the engine to cool before
measuring/adjusting valve lash clearance.
Only qualified service personel should perform this
maintenance. Refer to the Service Manual or your au-
thorized Perkins dealer or your Perkins distributor for
the complete valve lash adjustment procedure.
Operation of Perkins engines with incorrect valve
lash can reduce engine efficiency, and also reduce
engine component life.
Note: The valve bridges must be equalized before
the valve lash is adjusted.
Record the valve clearance. Refer to Systems
Operation, Testing and Adjusting, "Valve Lash -
Adjust" for the correct procedure.
Note: The valve depth is to be measured at every
g01554776
service. The valve recession can then be calculated.
A valve recession tool has been designed to give
service personnel a good indication of the cylinder
head valve recession or cylinder head valve seat
wear without the need to remove the cylinder heads.
Refer to Operation and Maintenance Manual,
Overhaul (Top End) or contact your Perkins
distributor for more information.
SEBU8430-02
i09157689
NOTICE
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