A Series Diesel Engine Troubleshooting Logic 51
Excessive Engine Noises
Cause
Correction
Drive Belt Squeal, Insufficient
Tension or Abnormally High
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Check the Tensioner and Inspect the Drive
Belt. Make Sure Water Pump, Tensioner
Pulley, Fan Hub and Alternator Turn Freely.
OK
Check the Tension of Accessory Drive
Belts. Refer to the Equipment
Manufacturer’s Procedures. Make Sure the
Accessories Turn Freely.
Intake Air or Exhaust Leaks
Refer to Troubleshooting Logic for
Excessive Exhaust Smoke.
OK
Excessive Valve Lash
Adjust Valves. Make sure the Push rods are
not Bent or the Rocker Levers are Not
Severely Worn. Refer to Page 162
OK
Turbocharger Noise
Check Turbocharger Impeller and Turbine
Wheel for Housing Contact. Refer to Page
101
OK
Gear Train Noise
Visually Inspect and Measure Gear
Backlash. Replace Gears as Required.
Refer to Page 161
OK
Power Function Knock
Check/Replace Rod and Main Bearings.
Refer to Page 165
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