As you read in chapter 2, graphic records play an important part in keeping an engine in proper operating condition. When used properly they can

Figure 3-6.Sectional view of a thermocouple.

tell you how your engine is performing and what is happening inside the engine. Graphic records indicate the overall condition of an engine and warn you when certain parts are beginning to wear out so that you may take prompt corrective ac-tions and prevent major casualties.

ADJUSTMENT AND MAINTENANCE

An internal combustion engine is a complicated machine, built with a high degree of precision throughout and capable of long dependable service if it is kept in good operating condition. To keep an engine in good operating condition you must perform all the adjustments and maintenance prescribed in your installed PMS and the manufacturers technical manuals. In this section you will read about the adjustment and maintenance of various components of an internal combustion engine.