Subaru Legacy (2005 year). Service manual - part 289

 

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Subaru Legacy (2005 year). Service manual - part 289

 

 

ME(H4DOTC)-99

MECHANICAL

Engine Noise

27.Engine Noise 

A: INSPECTION

NOTE*)
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 EN(H4DOTC)(diag)-37, OPERATION, Clear Memory Mode.> and inspec-
tion mode <Ref. to EN(H4DOTC)(diag)-30, PROCEDURE, Inspection Mode.> after connecting the fuel injector connector.

Type of sound

Condition

Possible cause

Regular clicking sound

Sound increases as engine 
speed increases.

• Defective valve mechanism
• Incorrect valve clearance
• Worn camshaft
• Broken valve spring

Heavy and dull clank

Oil pressure is low.

• Worn camshaft main bearing
• Worn connecting rod bearing (large end)

Oil pressure is normal.

• Loose flywheel mounting bolts
• Damaged engine mounting

High-pitched clank

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 to 2,000 rpm

Sound is reduced when fuel 
injector connector of noisy cyl-
inder is disconnected. 
(NOTE*)

• 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 cyl-
inder is disconnected. 
(NOTE*)

• 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 dis-
connected in turn. (NOTE*)

• Unusually worn valve lifter
• 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

• Insufficient compression
• Air leakage in air intake system, hoses, connections or mani-
folds

Timing belt noise

• Loose timing belt
• Belt contacting with case/adjacent part

Valve tappet noise

• Incorrect valve clearance

ME(H4DOTC)-100

MECHANICAL

Engine Noise

EX(H4DOTC)-2

EXHAUST

General Description

1. General Description

A: COMPONENT

1. FRONT EXHAUST PIPE

(1)

Front exhaust pipe ASSY

Tightening torque: N

m (kgf-m, ft-lb)

(2)

Gasket

T1: 35 (3.6, 26.0)

(3)

Turbocharger joint pipe

T2: 30 (3.1, 22.1)

(4)

Front exhaust pipe cover

T3: 7.5 (0.76, 5.5)

EX-02105

T2

(3)

(1)

(4)

(2)

T1

T1

T3

(2)

(2)

(2)

 

 

 

 

 

 

 

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