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| Illustration 1 | g00947059 |
Some engines may be equipped with a different service indicator.
Observe the service indicator. Clean the air cleaner element or replace the element when any of the following conditions occur:
- The yellow diaphragm enters the red zone.
- The red piston locks in the visible position.
- The air restriction reaches 3.75 kPa (15 inch of H2O).
Test the Service Indicator
Service indicators are important instruments.
- Apply vacuum (suction) to the service indicator.
- Reset the service indicator.
If the yellow core does not latch at the greatest vacuum, or if service indicator does not reset easily, obtain a new service indicator. If the new service indicator will not reset, the fitting for the service indicator may be plugged.
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| Illustration 2 | g00924884 |
A porous filter is part of the fitting that is used for mounting of the service indicator. Inspect the filter for cleanliness. Clean the filter, if necessary. Use compressed air or a clean, nonflammable solvent.
Note: When service indicator is installed, excessive tightening may crack the top of the service indicator. Tighten the service indicator to a torque of 2 N·m (18 lb in).
Replace the service indicator annually regardless of the operating conditions.