TM9-2320-361-34 Table 2-1. Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR lNSPECTlON CORRECTIVE ACTION 9. ENGINE MISFIRES DURING OPERATION Step 1. Step 2. Step 3. Step 4. Step 5. Verify fuel injector nozzle feed lines are correctly installed in fuel injector pump hydraulic head (para. 5-3). If fuel injector nozzle feed lines are incorrectly installed, remove and install in correct location (para. 5-3). Check fuel injector nozzle operation (malfunction 18, step 2). Check fuel injection pump operation (malfimction 18, step 6). Check engine valve train operation and valve lash adjustment (malfunction 3, step 2). Check engine cylinders compression readings (malfunction 11, steps 1 and 2). END OF TESTING! 10. ENGINE STOPS DURING NORMAL OPERATION Step 1. Perform engine troubleshooting malfunction 4. Step 2. Perform engine troubleshooting malfunction 1, step 2. END OF TESTING! 11. EXHAUST COLOR BLUE DURING NORMAL OPERATION NOTE Blue exhaust indicates presence of excess engine oil in cylinder combustion chamber. Step 1. Engine cylinder compression test, a. b. c. d. Preparation: Check for proper valve and rocker arms movement and ensure they are adjusted to specifications (para. 3-7); cutoff fuel supply at fuel pump (TM 9-2320-361-20); ensure batteries are fully charged and starter operates normally; and remove all plugs in cylinder heads. Connect compression gage and necessary adapter to plug port of number 1 cylinder. Crank engine through at least five compression strokes or until gage stops rising. Record cylinder number and maximum gage reading. Remove gage from number 1 cylinder. This is the “dry” test. Repeat step 1b for remaining cylinders. Add 1 to l-1/2 oz (29-44 ml) of clean engine oil through plug port for each cylinder before connecting compression gage. Repeat steps 1b and 1c. This is the “wet” test. Record gage readings for “wet” test beside readings for “dry” test for each cylinder. Step 2. Analysis of compression test results. a. b. Compute compression loss for “dry” test for each cylinder compared to cylinder with highest reading using the following formula: Highest Sample Cylinder Reading - Cylinder Reading X 100=% Compression Loss Highest Cylinder Reading If one or more cylinders has an 8-10% or greater compression loss in “dry” test, but improved to acceptable (less than 8%) loss in “wet” test, piston, piston rings, or cylinder liner problem is indicated. Remove head(s) and inspect pistons, piston rings, and cylinder liner for breaks, wear, and scoring. If damaged, replace engine (para. 3-18). 2-9