oil, the engine should neither be pulling a load nor idled above a speed of 425 rpm.
Lubrication intervals shown on lubrication orders are based on normal operation and may be
reduced or increased to compensate for locomotive use varying from the normal.
2.13. COOLING SYSTEM
All moving parts of the cooling system have to be oiled periodically. Frequent cleaning and
flushing of the system can be eliminated by using treated water or distilled water mixed with a corrosion
inhibitor. Untreated water causes scale to form and the system must be flushed as follows: (1) flush
with clear water until it runs clean; (2) flush with a strong alkaline solution and rinse with clear water;
(3) flush with a scale remover and rinse with clear water; and (4) neutralize with a weak alkaline
solution.
2.14. AIR SYSTEM
Faulty operation of the air system is most often caused by worn parts or dirty, dry, or worn
filters, pistons, and diaphragms. The parts should be lubricated and cleaned as follows:
Clean and oil the air filter. Dry, compressed air should be directed against the filter. Or it can be
cleaned with an alkali-free hydrocarbon solvent, dried, dipped in an oil bath, and drained.
Drain condensate from the intercooler, keep the intercooler core sections clean to permit free
passage of cooling air, and check the intercooler safety valve manually to be sure it is not stuck. If the
intercooler pressure is unusually high, check the operation of the high-pressure suction and discharge
valves. If the pressure is unusually low, check the operation of the low-pressure suction and discharge
valves. Drain the intercooler every time the main reservoirs are drained. A drain cock is located in the
bottom header of each bank of intercooler tubes. When handling the intercooler, be careful to avoid
damage to the finned tubing and also to keep from placing undue strain on the header assembly. The top
header is one piece while the bottom header is in two pieces to accommodate expansion caused by
temperature change. The lower headers are tied together with a bottom tie strap and capscrews; when
they are removed the intercooler may be lifted vertically. When handling, replace the strap to keep from
distorting the assembly.
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