Table 2-7. Engine Troubleshooting (CONT).
TEST OR INSPECTION
24. COOLANT CONTAMINATED.
Coolant rusty, operation without correct mixture of antifreeze and water.
Drain and flush the cooling system. Fill with correct mixture of antifreeze and water
Lubricating oil leaks from lubricating oil cooler, head gasket, head and cylinder block.
Notify Direct Support.
25. LUBRICATING OIL CONTAMINATED.
Coolant in the lubricating oil, internal engine component leaks.
Perform engine oil service (Para 8-2).
Fuel pump seal leaking.
Repair or replace fuel pump (Para 8-21).
26. COMPRESSION KNOCKS.
Malfunctioning ether starting aid.
Repair or replace ether starting aid (Para 8-8).
Air in the fuel system.
Bleed the fuel system (TM 9-4940-568-10).
Verify by operating the engine with clean fuel from a temporary tank.
Verify that engine load rating is not being exceeded.
27. FUEL CONSUMPTION EXCESSIVE.
Check for external leaks and engine lubricating oil dilution.
For fuel dilution, check for internal leaks at the fuel transfer pump and injection pump.
Intake air or exhaust restriction.
Check or replace air filter and exhaust system (Para 8-12 and 8-23).