Subaru Legacy IV (2008 year). Service manual — part 491
ME(H6DO)-90
Engine Trouble in General
MECHANICAL
7. After burning in exhaust
system
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened or cracked intake duct
C
Loosened or cracked PCV hose
C
Loosened or cracked vacuum hose
B
Defective PCV valve
B
Loosened oil filler cap
C
Timing chain
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective gasket
C
Improper valve sealing
B
Defective valve stem
C
Worn or broken valve spring
C
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
A
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Lubrication system
Incorrect oil pressure
C
Cooling system
Over-cooling
C
Others
Evaporative emission control system malfunction
C
8. Knocking
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened oil filler cap
B
Timing chain
Defective timing
B
Compression
Incorrect valve clearance
C
Incorrect valve timing
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Cooling system
Over-heating
A
9. Excessive engine oil con-
sumption
Intake system
Loosened or cracked PCV hose
A
Defective PCV valve
B
Loosened oil filler cap
C
Compression
Defective valve stem
A
Worn or stuck piston rings, cylinder and piston
A
Lubrication system
Loosened oil pump attaching bolts and defective gas-
ket
B
Defective oil filter O-ring
B
Defective crankshaft oil seal
B
Defective rocker cover gasket
B
Loosened oil drain plug or defective gasket
B
Loosened oil pan fitting bolts or defective oil pan
B
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H6DO)-91
Engine Trouble in General
MECHANICAL
10. Excessive fuel consump-
tion
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Dirty air cleaner element
A
Timing chain
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective gasket
C
Improper valve sealing
B
Defective valve stem
C
Worn or broken valve spring
C
Worn or stuck piston rings, cylinder and piston
B
Incorrect valve timing
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Lubrication system
Incorrect oil pressure
C
Cooling system
Over-cooling
C
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H6DO)-92
Engine Noise
MECHANICAL
29.Engine Noise
A: INSPECTION
NOTE*)
When disconnecting the fuel injector connector, the malfunction indicator light illuminates and DTC is stored in ECM memory.
Therefore, perform the Clear Memory Mode <Ref. to EN(H6DO)(diag)-52, OPERATION, Clear Memory Mode.> and Inspection
Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE, Inspection Mode.> after connecting the fuel injector connector.
Type of sound
Condition
Possible cause
Regular clicking sound
Sound increases as engine
speed increases.
• Valve mechanism is defective.
• Incorrect valve clearance
• Worn camshaft
• Broken valve spring
• Trouble of valve lifter
Heavy and dull clank
Oil pressure is low.
• Worn crankshaft main bearing
• Worn connecting rod bearing (large end)
Oil pressure is normal.
Damaged engine mounting
High-pitched clank
Sound is noticeable when
accelerating with an overload
condition.
• Ignition timing advanced
• Accumulation of carbon inside combustion chamber
• Wrong heat range of spark plug
• Improper octane value of gasoline
Clank when engine speed is
between 1,000 and 2,000 rpm.
Noise is reduced when fuel
injector connector of noisy cyl-
inder is disconnected.
(NOTE*)
• Worn crankshaft main bearing
• Worn connecting rod bearing (large end)
Knocking sound when engine
is operating under idling speed
and engine is warm
Noise 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 gear
• Worn camshaft journal bore in cylinder head
Squeaky sound
—
Insufficient generator lubrication
Rubbing sound
—
Poor contact of generator brush and rotor
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, hose, connection or manifold
Timing chain noise
—
• Loose timing chain
• Timing chain contacting with adjacent part
Valve noise
—
• Incorrect valve clearance
• Trouble of valve lifter
EX(H6DO)-2
General Description
EXHAUST
1. General Description
A: COMPONENT
EX-02374
T2
T4
T5
T1
T1
T3
T3
T4
T4
(18)
(12)
(11)
(10)
(8)
T6
T6
(20)
(21)
(22)
(23)
(25)
(24)
(17)
(24)
(24)
(24)
(26)
(24)
(25)
(16)
(26)
(13)
(15)
(19)
(14)
T3
(6)
(7)
(5)
T3
(4)
(3)
(1)
(2)
(9)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст