ENGINE TROUBLESHOOTING (CONT)
TEST OR INSPECTION
15. COOLANT IN LUBE OIL
Step 1. Disassemble and inspect engine oil cooler core.
Step 2. If engine oil cooler core is not the problem then begin engine disassembly.
a. Remove cylinder head and check for cracks or defects.
A new spacer plate gasket and cylinder head gasket must be used whenever heads are disassembled.
b. Inspect cylinder liner seals for defects.
c. Inspect cylinder blocks for cracks or defects. (See page 3-250.)
d. If above components were not defective, assume the fault was the cylinder head gasket.
16. BLACK OR GRAY SMOKE FROM EXHAUST
Step 1. Inspect air inlet filter for obstruction.
Replace air filter element. (See TM 10-3930-641-20.)
Step 2. Inspect fuel ratio control.
Step 3. Inspect fuel injection pumps.