1999 SUBARU LEGACY timing belt

2. Engine Noise
Type of sound Condition Possible cause
Regular clicking soundSound increases as engine
speed increases.IValve mechanism is defective.
IIncorrect valve clearance
IWorn valve rocker
IWorn camshaft
IBroken valve spring
Heavy and dull clankOil pressure is low.IWorn crankshaft main bearing
IWorn connecting rod bearing (big end)
Oil pressure is normal.ILoose flywheel mounting bolts
IDamaged engine mounting
High-pitched clank
(Spark knock)Sound is noticeable when
accelerating with an overload.IIgnition timing advanced
IAccumulation of carbon inside combustion chamber
IWrong spark plug
IImproper gasoline
Clank when engine speed is
medium (1,000 to 2,000 rpm)Sound is reduced when fuel
injector connector of noisy cyl-
inder is disconnected.
(NOTE*)IWorn crankshaft main bearing
IWorn bearing at crankshaft end of connecting rod
Knocking sound when engine
is operating under idling speed
and engine is warmSound is reduced when fuel
injector connector of noisy cyl-
inder is disconnected.
(NOTE*)IWorn cylinder liner and piston ring
IBroken or stuck piston ring
IWorn 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*)IUnusually worn valve lifter
IWorn cam gear
IWorn camshaft journal bore in crankcase
Squeaky sound ÐIInsufficient generator lubrication
Rubbing sound ÐIDefective generator brush and rotor contact
Gear scream when starting
engineÐIDefective ignition starter switch
IWorn gear and starter pinion
Sound like polishing glass with
a dry clothÐILoose drive belt
IDefective engine coolant pump shaft
Hissing sound ÐILoss of compression
IAir leakage in air intake system, hoses, connections or
manifolds
Timing belt noise ÐILoose timing belt
IBelt contacting case/adjacent part
Valve tappet noise ÐIIncorrect valve clearance
NOTE*:
When disconnecting fuel injector connector, Malfunction Indicator Light (CHECK ENGINE light) illuminates and trouble code is
stored in ECM memory.
Therefore, carry out the CLEAR MEMORY MODE and INSPECTION MODE after con-
necting fuel injector connector.
78
2-3a[K200]DIAGNOSTICS
2. Engine Noise

1. Engine
A: SPECIFICATIONS
EngineTypeHorizontally opposed, liquid cooled, 4-cylinder,
4-stroke gasoline engine
Valve arrangementBelt driven, double over-head camshaft, 4-valve/
cylinder
Bore´Stroke mm (in) 99.5´79.0 (3.917´3.110)
Displacement cm
3(cu in) 2,457 (149.93)
Compression ratio 9.5
Compression pressure
(at 200 Ð 300 rpm)Standard kPa (kg/cm
2, psi) þ rpm 1,216 (12.4, 176) þ 350
Limit kPa (kg/cm2, psi) þ rpm 941 (9.6, 137) þ 350
Number of piston rings Pressure ring: 2, Oil ring: 1
Intake valve timingOpening 6É BTDC
Closing 50É ABDC
Exhaust valve timingOpeningFront: 54É BBDC, Rear: 30É BBDC (Position in
degrees)
ClosingFront: 10É ATDC, Rear: 10É ATDC (Position in
degrees)
Valve clearanceIntake mm (in) 0.20±0.02 (0.0079±0.0008)
Exhaust mm (in) 0.25±0.02 (0.0098±0.0008)
Idling speed
[At neutral position on MT, or ªPº
or ªNº position on AT]rpm700±100 (No load)
850±50 (A/C switch ON)
Firing order 1®3®2®4
Ignition timing BTDC/rpm 15ɱ8É/700 rpm
2
2-3b[S1A0]SPECIFICATIONS AND SERVICE DATA
1. Engine

1. Timing Belt
S2M0291A
(1) Right-hand belt cover No. 2
(2) Timing belt guide (MT vehicles
only)
(3) Crankshaft sprocket
(4) Left-hand belt cover No. 2
(5) Tensioner bracket
(6) Automatic belt tension adjuster
ASSY
(7) Belt idler
(8) Right-hand exhaust camshaft
sprocket(9) Right-hand intake camshaft
sprocket
(10) Left-hand intake camshaft
sprocket
(11) Left-hand exhaust camshaft
sprocket
(12) Timing belt
(13) Belt idler No. 2
(14) Belt idler
(15) Left-hand belt cover
(16) Front belt cover(17) Right-hand belt cover
(18) Crankshaft pulley
Tightening torque: N´m (kg-m, ft-lb)
T1:
4.9±0.5 (0.5±0.05, 3.6±0.4)
T2:9.8±1.0 (1.0±0.1, 7.2±0.7)
T3:25±3 (2.5±0.3, 18.1±2.2)
T4:39±4 (4.0±0.4, 28.9±2.9)
T5:78±5 (8.0±0.5, 57.9±3.6)
T6:177±10 (18.0±1.0, 130±7)
7
[C100]2-3bCOMPONENT PARTS
1. Timing Belt

1. Precautions
A: GENERAL PRECAUTIONS
(1) Before disassembling engine, place it on ST3.
ST1 498457000 ENGINE STAND ADAPTER
RH
ST2 498457100 ENGINE STAND ADAPTER
LH
ST3 499817000 ENGINE STAND
G2M0709
(2) All parts should be thoroughly cleaned, paying
special attention to the engine oil passages, pis-
tons and bearings.
(3) Rotating parts and sliding parts such as piston,
bearing and gear should be coated with oil prior to
assembly.
(4) Be careful not to let oil, grease or coolant con-
tact the timing belt, clutch disc and flywheel.
(5) All removed parts, if to be reused, should be
reinstalled in the original positions and directions.
(6) Gaskets and lock washers must be replaced
with new ones. Liquid gasket should be used
where specified to prevent leakage.
(7) Bolts, nuts and washers should be replaced
with new ones as required.
(8) Even if necessary inspections have been
made in advance, proceed with assembly work
while making rechecks.
13
[W1A0]2-3bSERVICE PROCEDURE
1. Precautions

2. Timing Belt
A: REMOVAL
1. CRANKSHAFT PULLEY AND BELT COVER
B2M1705C
(1) V-belt
(2) Crankshaft pulley bolt(3) Crankshaft pulley
(4) Left-hand belt cover No. 1(5) Right-hand belt cover No. 1
(6) Front belt cover
1) Remove V-belt cover, V-belt and air condition-
ing compressor drive belt tensioner. [G2B0].>
B2M1706
2) Remove pulley bolt. To lock crankshaft, use ST.
ST 499977100 CRANKSHAFT PULLEY
WRENCH
H2M2393A
3) Remove crankshaft pulley.
4) Remove left-hand belt cover.
B2M0729
14
2-3b[W2A1]SERVICE PROCEDURE
2. Timing Belt

5) Remove right-hand belt cover.
B2M0730
6) Remove front belt cover.
B2M0731
2. TIMING BELT
S2M0295A
(1) Timing belt guide (MT vehicles
only)(2) Belt idler
(3) Timing belt(a) Alignment marks
G2M0713
15
[W2A2]2-3bSERVICE PROCEDURE
2. Timing Belt

1) Remove timing belt guide. (MT vehicles only)
S2M0294
2) If alignment mark and/or arrow mark (which
indicates rotation direction) on timing belt fade
away, put new marks before removing timing belt
as follows:
(1) Turn crankshaft using ST, and align align-
ment marks on crankshaft sprocket, left-hand
intake camshaft sprocket, left-hand exhaust
camshaft sprocket, right-hand intake camshaft
sprocket and right hand exhaust camshaft
sprocket with notches of belt cover and cylinder
block.
ST 499987500 CRANKSHAFT SOCKET
S2M0407A
(2) Using white paint, put alignment and/or
arrow marks on timing belts in relation to the
sprockets.
Z1: 54.5 tooth length
Z
2: 51 tooth length
Z
3: 28 tooth length
H2M2396A
S2M0408
B2M0689
3) Remove belt idler.
H2M2398
16
2-3b[W2A2]SERVICE PROCEDURE
2. Timing Belt

4) Remove timing belt.
CAUTION:
After timing belt has been removed, never
rotate intake and exhaust, camshaft sprocket.
If camshaft sprocket is rotated, the intake and
exhaust valve heads strike together and valve
stems are bent.
S2M0409
3. BELT IDLER AND AUTOMATIC BELT TENSION ADJUSTER ASSEMBLY
H2M2400C
(1) Belt idler
(2) Belt idler No. 2(3) Automatic belt tension adjuster
ASSY
1) Remove belt idler.
S2M0410
2) Remove belt idler No. 2.
S2M0411
17
[W2A3]2-3bSERVICE PROCEDURE
2. Timing Belt