Excessive Engine Noises - Dodge D250 1990 Service Manual

Base Engine Components
DODGE Turbo Diesel
Troubleshooting Logic
Page 9A-39
Excessive Engine Noises
Cause
Correction
Drive Belt Squeal, Insufficient Tension
Check the Tensioner and Inspect the
Drive Belt. Make Sure Wafer Pump,
or Abnormally High Loading Tensioner Pulley, Fan Hub and
Alternator Turn Freely.
OK
•
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 and Rocker Levers
or Adjusting Screws are Not Severely
Worn.
OK
•
Turbocharger Noise
Check Turbocharger Impeller and
Turbine Wheel for Housing Contact.
OK
t
Gear Train Noise
Visually inspect and Measure Gear
Backlash. Replace Gears as Required.
OK
t
Power Function Knock Check/Replace Rod and Main Bearings.