Air Compressor Checking
Caution: The air compressor discharge line must be
disconnected at the compressor to allow the compres-
sor to discharge air to the atmosphere during this next
test to prevent the compressor from overheating. Do not
run the engine over 5 minutes with components isolated
from the cooling system. Component damage can occur.
Disconnect the coolant supply and the return hoses from
the air compressor. Use a short piece of hose to connect
the hoses together to prevent coolant loss during engine
operation.
Repeat the test for air in the cooling system as previously
described. If no air is found in the cooling system with the
air compressor isolated, install a new or rebuilt air com-
pressor.
NOTE: Start the engine and run for five minutes before
testing for air in the coolant. This will allow any air trapped
to purge from the system.
Cylinder Head and Cylinder Liner
If the engine still fails the test for air in the cooling system
with the fan, shutter controls, and the air compressor
isolated from the cooling system; or if the combustion
leak test is positive, pressure check the cylinder heads.
Refer to Procedure 7-19.
Cooling System - Testing For Air Or Combustion Gases (1-10) Section 1 - Cooling System
N14Page 1-32
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