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TROUBLESHOOTING
Page 61
Low power complaints may result from many
factors other than an engine problem. Be sure to
check the chassis and trailer for dragging brakes
and assess the drivetrain combination for
driveability and application (engine-rated bhp,
transmission and rear-axle ratios, tire sizes, etc.).
ENGINE WILL NOT ACHIEVE NO-LOAD GOVERNED RPM
EXCESSIVE BLACK OR GRAY SMOKE
Possible Cause
Correction
1. Code(s) present.
1. Correct cause of code(s).
Possible Cause
Correction
1. Code(s) present.
1. Correct cause of code(s).
2. Intercooler core leakage.
2. Pressure-test intercooler. If test results are unsatisfactory,
remove, repair or replace intercooler as needed.
3. Intercooler core fin obstructions.
3. Clean intercooler fins.
4. Insufficient air for combustion.
4. Check air cleaner for restrictions. Check inlet manifold pressure,
and inspect the turbocharger for proper operation. Repair or
replace as required.
5. Excessive exhaust back pressure.
5. Check for faulty exhaust piping or restrictions in the muffler.
Repair or replace as required.
6. Improper grade of fuel.
6. Drain fuel from tank(s). Replace fuel filters and fill tank(s) with
MACK-specified diesel fuel.
7. Defective fuel injection nozzle or unit pump.
7. Isolate defective nozzle and replace. Refer to item 8 under
ENGINE MISFIRES — NO CODE(S) chart.
8. Improper engine valve adjustment.
8. Reset valve adjustment.
9. Malfunctioning exhaust/intake valve.
9. Repair cylinder head/valve train.
5_106_00.bk Page 61 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs