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HOMESERVICE MANUALSSUBARU2005OUTBACK I, STANDARDREPAIR AND DIAGNOSISENGINE MECHANICALTIMING BELTENGINE MECHANICAL (H4SO)ENGINE NOISEINSPECTION
2005 Subaru Outback i, Standard

Engine Noise: Inspection

2005 Subaru Outback i, StandardSECTION Inspection
DIAGNOSTIC REFERENCE ENGINE NOISE

Type of sound Condition Possible cause
Regular clicking sound Sound increases as engine speed increases.
  • Valve mechanism is defective.
  • Incorrect valve clearance
  • Worn valve rocker
  • Worn camshaft
  • Broken valve spring
Heavy and dull clank Oil pressure is low.
  • Worn camshaft main bearing
  • Worn connecting rod bearing (big end)
Oil pressure is normal. Damaged engine mounting
High-pitched clank (Spark knock) Sound is noticeable when accelerating with an overload.
  • Ignition timing advanced
  • Accumulation of carbon inside combustion chamber
  • Wrong spark plug
  • Improper gasoline
Clank when engine speed is 1,000 rpm to 2,000 rpm Sound is reduced when fuel injector connector of noisy cylinder is disconnected. ((1))
  • Worn camshaft main bearing
  • Worn bearing at crankshaft end of connecting rod
Knocking sound when engine is operating under idling speed and engine is warm Sound is reduced when fuel injector connector of noisy cylinder is disconnected. ((1))
  • Worn cylinder liner and piston ring
  • Broken or stuck piston ring
  • Worn piston pin and hole at piston end of connecting rod
Sound is not reduced if each fuel injector connector is disconnected in turn. ((1))
  • Worn cam sprocket
  • Worn camshaft journal bore in crankcase
Squeaky sound - Insufficient generator lubrication
Rubbing sound - Defective generator brush and rotor contact
Gear scream when starting engine -
  • Defective ignition starter switch
  • Worn gear and starter pinion
Sound like polishing glass with a dry cloth -
  • Loose drive belt
  • Defective water pump shaft
Hissing sound -
  • Loss of compression
  • Air leakage in air intake system, hoses, connections or manifolds
Timing belt noise -
  • Loose timing belt
  • Belt contacting with case/adjacent part
Valve tappet noise - Incorrect valve clearance
NOTE:
(1) When disconnecting the fuel injector connector, the malfunction indicator light illuminates and DTC is stored in ECM memory. Therefore, carry out the clear memory mode < Ref. to OPERATION , Clear Memory Mode.> and inspection mode < Ref. to PROCEDURE , Inspection Mode.> after connecting the fuel injector connector.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.