1996 SUBARU LEGACY timing belt

2. Engine Noise
Valve lash adjusters may make clicking noise once engine
starts. It is normal if clicking noise ceases after a few min-
utes.
If clicking noise continues after a few minutes, check
engine oil level and add oil if necessary.
Then, do as follows to cease clicking noise.
1) Warm-up engine for five minutes.
2) Turn ignition switch OFF.
3) Connect test mode connector.
4) Start the engine and run it at approximately 2,000 rpm
for twenty minutes.
5) Turn ignition switch OFF.
6) Disconnect test mode connector.
7) Start the engine and check that clicking noise is ceased.
If noise still exists, conduct troubleshooting procedures in
accordance with the following table.
CAUTION:
Do not disconnect spark plug cord while engine is run-
ning.
Type of sound Condition Possible cause
Regular clicking soundSound increases as engine
speed increases.Valve mechanism is defective.
Broken lash adjuster
Worn valve rocker
Worn camshaft
Broken valve spring
Worn valve lifter hole
Heavy and dull clankOil pressure is low.Worn crankshaft main bearing
Worn connecting rod bearing (big end)
Oil pressure is normal.Loose flywheel mounting bolts
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
medium (1,000 to 2,000 rpm).Sound is reduced when fuel
injector connector of noisy
cylinder is disconnected.
(NOTE*)Worn crankshaft 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.
(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
disconnected in turn. (NOTE*)Unusually worn valve lifter
Worn cam gear
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 engine coolant pump shaft
78
2-3DIAGNOSTICS
2. Engine Noise

Type of sound Condition Possible cause
Hissing sound—Loss of compression
Air leakage in air intake system, hoses, connections or
manifolds
Timing belt noise—Loose timing belt
Belt contacting case/adjacent part
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 connecting fuel injector connector. (Ref. to 2-7 On-Board
Diagnostics II System.)
79
2-3DIAGNOSTICS
2. Engine Noise

1. Engine
A: SPECIFICATIONS
EngineModel2500 cc
TypeHorizontally opposed, liquid cooled, 4-cylinder, 4-stroke
gasoline engine
Valve arrangement Belt driven, double over-head camshaft, 4-valve/cylinder
Bore x Stroke mm (in) 99.5 x 79.0 (3.917 x 3.110)
Displacement cm
3(cu in) 2,457 (149.93)
Compression ratio9.5
Compression pressure
(at 200 — 300 rpm)
kPa (kg/cm
2, psi) rpmStandard 1,216 (12.4, 176) 350
Limit 941 (9.6, 137) 350
Number of piston rings Pressure ring: 2, Oil ring: 1
Intake valve timingOpening 6° BTDC
Closing 50° ABDC
Exhaust valve timingOpening 62° BBDC
Closing 10° ATDC
Idling speed
[At neutral position on MT, or
“P” or “N” position on AT] rpm700±100 (No load)
850±50 (A/C switch ON)
Firing order1,3,2,4
Ignition timing BTDC/rpm 15°±8°/700 rpm
2
2-3bSPECIFICATIONS AND SERVICE DATA
1. Engine

1. Timing Belt
B2M0726A

1Right-hand belt cover No. 2


2Crankshaft sprocket


3Left-hand belt cover No. 2


4Tensioner bracket


5Tensioner adjuster


6Belt tensioner


7Belt idler


8Right-hand exhaust camshaft sprocket


9Right-hand intake camshaft sprocket


10Left-hand intake camshaft sprocket


11Left-hand exhaust camshaft sprocket


12Timing belt


13Belt idler No. 2

14Belt idler


15Left-hand belt cover


16Front belt cover


17Right-hand belt cover


18Crankshaft pulley
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 4.9±0.5 (0.5±0.05, 3.6±0.4)
T2: 25±2 (2.5±0.2, 18.1±1.4)
T3: 39±4 (4.0±0.4, 28.9±2.9)
T4: 78±5 (8.0±0.5, 57.9±3.6)
T5: 127±5 (13.0±0.5, 94.0±3.6)
6
2-3bCOMPONENT PARTS
1. Timing Belt

G2M0709
1. 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
2) All parts should be thoroughly cleaned, paying special
attention to the engine oil passages, pistons 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 contact 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.
11
2-3bSERVICE PROCEDURE
1. General Precautions

2. Timing Belt
A: REMOVAL
1. CRANKSHAFT PULLEY AND BELT COVER
B2M0684A
G2M0711
1) Remove V-belt cover, V-belt and air conditioning com-
pressor drive belt tensioner.
2) Remove pulley bolt. To lock crankshaft, use ST.
ST 499977000 CRANKSHAFT PULLEY WRENCH
3) Remove crankshaft pulley.
B2M0729
4) Remove left-hand belt cover.
12
2-3bSERVICE PROCEDURE
2. Timing Belt

B2M0730
5) Remove right-hand belt cover.
B2M0731
6) Remove front belt cover.
13
2-3bSERVICE PROCEDURE
2. Timing Belt

2. TIMING BELT
B2M0685A
G2M0713
B2M0686A
1) 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 alignment
marks on crankshaft sprocket, left-hand intake cam-
shaft 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
14
2-3bSERVICE PROCEDURE
2. Timing Belt