PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —86— 22-01691 (R02/02)
Pyrometer
Maintaining Correct Operating Temperature
The optional pyrometer indicates engine exhaust gas temperature.
Because it responds almost immediately to changes in exhaust tem-
perature, the pyrometer is an excellent indicator of engine output.
If you watch engine speed and exhaust temperature ranges, the
pyrometer can help you operate your truck more efficiently and avoid
sudden changes in engine operating temperature.
Procedure For Reducing High Pyrometer Temperature Readings
1. If the pyrometer indicates excessive temperature, ease up slightly
on the throttle.
2. If RPM and speed drop, downshift one gear to help lower the
exhaust temperature.
3. Observe the pyrometer reading. If the temperature continues to
be high, continue downshifting until acceptable operating tempera-
tures can be maintained.
Stopping The Engine
Before Stopping The Engine
A hot engine stores a great amount of heat. And it doesn’t cool down
immediately after you shut it off. Always cool your engine down
before shutting it off. You will increase its service life.
Idle the engine at 1000 RPM for five minutes. Then low idle for thirty
seconds before shutdown. This will allow circulating coolant and
lubricating oil to carry away heat from the cylinder head, valves, pis-
WARNING! Do not disassemble a spring brake cham-
ber. Disassembling the spring brake chamber is danger-
ous and could cause serious injury. These chambers
contain a powerful spring that is compressed. Sudden
release of this spring could cause you to be badly
injured.
CAUTION: Do not allow the pyrometer reading to
exceed the specified maximum operating temperature.
If the pyrometer has no label specifying the maximum
operating temperature for the pyrometer, contact your
engine distributor for a recommendation.
NOTE: Different size injectors or changes in altitude may
affect engine operating and exhaust temperatures.
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