Page 1489 of 2870

ME(H4DOTC)-33
MECHANICAL
Ignition Timing
4. Ignition Timing
A: INSPECTION
1. USING SUBARU SELECT MONITOR
1) Before checking the ignition timing speed, check
the following:
(1) Ensure the air cleaner element is free from
clogging, spark plugs are in good condition, and
that hoses are connected properly.
(2) Ensure the malfunction indicator light does
not illuminate.
2) Warm-up the engine.
3) Stop the engine, and then turn the ignition switch
to OFF.
4) Insert the cartridge to Subaru Select Monitor.
5) Connect the Subaru Select Monitor to data link
connector.
6) Turn the ignition switch to ON, and Subaru Se-
lect Monitor switch to ON.
7) Select the {2. Each System Check} in Main
Menu.
8) Select the {Engine Control System} in Selection
Menu.
9) Select the {1. Current Data Display & Save} in
Engine Control System Diagnosis.
10) Select the {1.12 Data Display} in Data Display
Menu.
11) Start the engine and check the ignition timing at
idle speed.
Ignition timing [BTDC/rpm]:
2.0 L model
12
°±10°/700
2.5 L model
17
°±10°/700
If the timing is not correct, check the ignition control
system. Refer to Engine Control System.
EN(H4DOTC)-2, Basic Diagnostics Procedure.>
Page 1490 of 2870

ME(H4DOTC)-34
MECHANICAL
Intake Manifold Vacuum
5. Intake Manifold Vacuum
A: INSPECTION
1) Warm-up the engine.
2) Disconnect the brake vacuum hose, and then in-
stall the vacuum gauge to hose fitting on manifold.
3) Keep the engine at the idle speed, and then read
the vacuum gauge indication.
By observing the gauge needle movement, the in-
ternal condition of engine can be diagnosed as de-
scribed below.
Vacuum pressure (at idling, A/C “OFF”):
Less than
−60.0 kPa (−450 mmHg, −17.72 inHg)
ME-00008
Diagnosis of engine condition by measurement of manifold vacuum
Vacuum gauge indication Possible engine condition
1. Needle is steady but lower than normal position. This ten-
dency becomes more evident as engine temperature rises.Leakage around intake manifold gasket or disconnection or
damaged vacuum hose
2. When engine speed is reduced slowly from higher speed,
needle stops temporarily when it is lowering or becomes steady
above normal position.Back pressure too high, or exhaust system clogged
3. Needle intermittently drops to position lower than normal
position.Leakage around cylinder
4. Needle drops suddenly and intermittently from normal posi-
tion.Sticky valves
5. When engine speed is gradually increased, needle begins to
vibrate rapidly at certain speed, and then vibration increases as
engine speed increases.Weak or broken valve springs
6. Needle vibrates above and below normal position in narrow
range.Defective ignition system or throttle chamber idle adjustment
Page 1491 of 2870

ME(H4DOTC)-35
MECHANICAL
Engine Oil Pressure
6. Engine Oil Pressure
A: INSPECTION
1) Remove the oil pressure switch from engine cyl-
inder block.
Pressure Switch.>
2) Connect the oil pressure gauge hose to cylinder
block.
3) Connect the battery ground cable to battery.
4) Start the engine, and then measure the oil pres-
sure.
Oil pressure:
98 kPa (1.0 kg/cm
2, 14 psi) or more at 800 rpm
294 kPa (3.0 kg/cm2, 43 psi) or more at 5,000
rpm
If the oil pressure is out of specification, check oil
pump, oil filter and lubrication line.
LU(H4SO)-24, INSPECTION, Engine Lubrication
System Trouble in General.>
If the oil pressure warning light is turned ON and
oil pressure is in specification, replace the oil pres-
sure switch.
Engine Lubrication System Trouble in General.>
NOTE:
The specified data is based on an engine oil tem-
perature of 80°C (176°F).
5) After measuring the oil pressure, install the oil
pressure switch.
LATION, Oil Pressure Switch.>
Tightening torque:
25 N
⋅m (2.5 kgf-m, 18.1 ft-lb)
FU-00009
ME-00009
Page 1492 of 2870

ME(H4DOTC)-36
MECHANICAL
Fuel Pressure
7. Fuel Pressure
A: INSPECTION
CAUTION:
Before removing the fuel pressure gauge, re-
lease the fuel pressure.
NOTE:
If out of specification, check or replace the pressure
regulator and pressure regulator vacuum hose.
1) Release the fuel pressure.
FU(H4DOTC)-54, RELEASING OF FUEL PRES-
SURE, OPERATION, Fuel.>
2) Open the fuel filler flap lid, and then remove the
fuel filler cap.
3) Disconnect the fuel delivery hoses from fuel fil-
ter, and then connect the fuel pressure gauge.
4) Connect the connector of fuel pump relay.
5) Start the engine.6) Measure the fuel pressure while disconnecting
the pressure regulator vacuum hose from intake
manifold.
Fuel pressure:
Standard; 284 — 314 kPa (2.9 — 3.2 kgf/cm2,
41 — 46 psi)
7) After connecting the pressure regulator vacuum
hose, measure the fuel pressure.
Fuel pressure:
Standard; 230 — 260 kPa (2.35 — 2.65 kgf/
cm
2, 33 — 38 psi)
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kgf/cm
2, 1 to 3 psi) higher than standard val-
ues during high-altitude operations.
ME-00010
FU-00262
ME-00011
ME-00011
Page 1493 of 2870

ME(H4DOTC)-37
MECHANICAL
Valve Clearance
8. Valve Clearance
A: INSPECTION
Inspection and adjustment of the valve clearance
should be performed while engine is cold.
1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.
3) Remove the air intake duct.
IN(H4DOTC)-8, REMOVAL, Air Intake Duct.>
4) Remove the bolts which secure the timing belt
cover (RH).
5) Lift-up the vehicle.
6) Remove the under cover.
7) Loosen the remaining bolts which secure the
timing belt cover (RH), and then remove the timing
belt cover.
8) Lower the vehicle.
9) When inspecting the #1 and #3 cylinders:
(1) Pull out the engine harness connector with
bracket from air cleaner upper cover.
(2) Remove the air cleaner case.
IN(H4DOTC)-7, REMOVAL, Air Cleaner.>
(3) Disconnect the ignition coil connector.
(4) Remove the ignition coil.
(5) Place a suitable container under the vehicle.
(6) Disconnect the PCV hose from rocker cover
(RH).
(7) Remove the bolts, and then remove the
rocker cover (RH).10) When inspecting the #2 and #4 cylinders:
(1) Disconnect the battery cable, and then re-
move the battery and battery carrier.
(2) Remove the bolt which secures the engine
harness bracket onto body.
(3) Disconnect the washer motor connectors.
(4) Remove the washer tank mounting bolts.
FU-00009
ME-00012
ME-00013
ME-00014
ME-00015
ME-00016
Page 1494 of 2870

ME(H4DOTC)-38
MECHANICAL
Valve Clearance
(5) Move the washer tank upward.
(6) Disconnect the ignition coil connector.
(7) Remove the ignition coil.
(8) Place a suitable container under the vehicle.
(9) Disconnect the PCV hose from rocker cover
(LH).
(10)Remove the bolts, and then remove the
rocker cover (LH).
11) Turn the crankshaft pulley clockwise until arrow
mark on the camshaft sprocket is set to position
shown in the figure.
NOTE:
Turn the crankshaft using socket wrench.
12) Measure the #1 cylinder intake valve and #3
cylinder exhaust valve clearance by using thick-
ness gauge (A).
NOTE:
Insert the thickness gauge in as horizontal a di-
rection as possible with respect to the shim.
Measure the exhaust valve clearances while lift-
ing-up the vehicle.
Valve clearance:
Intake: 0.20
±0.02 mm (0.0079±0.0008 in)
Exhaust: 0.35
±0.02 mm (0.0138±0.0008 in)NOTE:
If the measured value is not within specification,
take notes of the value in order to adjust the valve
clearance later on.
13) If necessary, adjust the valve clearance.
to ME(H4DOTC)-39, ADJUSTMENT, Valve Clear-
ance.>
14) Further turn the crankshaft pulley clockwise.
Using the same procedures described previously,
and then measure the valve clearances again.
(1) Set the arrow mark on camshaft sprocket to
position shown in the figure, and then measure
the #2 cylinder exhaust valve and #3 cylinder in-
take valve clearances.
(2) Set the arrow mark on camshaft sprocket to
position shown in the figure, and then measure
the #2 cylinder intake valve and #4 cylinder ex-
haust valve clearances.
ME-00017
ME-00733
ME-00019
(A)
ME-00734
ME-00735
Page 1495 of 2870

ME(H4DOTC)-39
MECHANICAL
Valve Clearance
(3) Set the arrow mark on camshaft sprocket to
position shown in the figure, and then measure
the #1 cylinder exhaust valve and #4 cylinder in-
take valve clearances.
15) After inspection, install the related parts in the
reverse order of removal.
Tightening torque:
33 N
⋅m (3.4 kgf-m, 25 ft-lb)
B: ADJUSTMENT
CAUTION:
Adjustment of the valve clearance should be
performed while engine is cold.
1) Measure all valve clearances.
ME(H4DOTC)-37, INSPECTION, Valve Clear-
ance.>
NOTE:
Record each valve clearance after it has been
measured.
2) Remove the camshaft.
69, REMOVAL, Camshaft.>
3) Remove the valve lifter.4) Measure the thickness of valve lifter with a mi-
crometer.
5) Select a shim of suitable thickness using mea-
sured valve clearance and valve lifter thickness, by
referring to the following table.
ME-00736
ME-00023
ME-00024
Unit: mm
Intake valve: S = (V+T) –0.20
Exhaust valve: S = (V+T) –0.35
S: Required thickness of valve lifter
V: Measured valve clearance
T: Used valve lifter thickness
Part No. Thickness mm (in)
13228 AB101 4.68 (0.1843)
13228 AB111 4.69 (0.1846)
13228 AB121 4.70 (0.1850)
13228 AB131 4.71 (0.1854)
13228 AB141 4.72 (0.1858)
13228 AB151 4.73 (0.1862)
13228 AB161 4.74 (0.1866)
13228 AB171 4.75 (0.1870)
13228 AB181 4.76 (0.1874)
13228 AB191 4.77 (0.1878)
13228 AB201 4.78 (0.1882)
13228 AB211 4.79 (0.1886)
13228 AB221 4.80 (0.1890)
13228 AB231 4.81 (0.1894)
13228 AB241 4.82 (0.1898)
13228 AB251 4.83 (0.1902)
13228 AB261 4.84 (0.1906)
13228 AB271 4.85 (0.1909)
13228 AB281 4.86 (0.1913)
13228 AB291 4.87 (0.1917)
13228 AB301 4.88 (0.1921)
13228 AB311 4.89 (0.1925)
13228 AB321 4.90 (0.1929)
13228 AB331 4.91 (0.1933)
13228 AB341 4.92 (0.1937)
13228 AB351 4.93 (0.1941)
13228 AB361 4.94 (0.1945)
13228 AB371 4.95 (0.1949)
13228 AB381 4.96 (0.1953)
ME-00025
Page 1496 of 2870

ME(H4DOTC)-40
MECHANICAL
Valve Clearance
6) Inspect all valves for clearance again at this
stage. If the valve clearance is not correct, repeat
the procedure over again from the first step.
7) After inspection, install the related parts in the
reverse order of removal.
13228 AB391 4.97 (0.1957)
13228 AB401 4.98 (0.1961)
13228 AB411 4.99 (0.1965)
13228 AB421 5.00 (0.1969)
13228 AB431 5.01 (0.1972)
13228 AB441 5.02 (0.1976)
13228 AB451 5.03 (0.1980)
13228 AB461 5.04 (0.1984)
13228 AB471 5.05 (0.1988)
13228 AB481 5.06 (0.1992)
13228 AB491 5.07 (0.1996)
13228 AB501 5.08 (0.2000)
13228 AB511 5.09 (0.2004)
13228 AB521 5.10 (0.2008)
13228 AB531 5.11 (0.2012)
13228 AB541 5.12 (0.2016)
13228 AB551 5.13 (0.2020)
13228 AB561 5.14 (0.2024)
13228 AB571 5.15 (0.2028)
13228 AB581 5.16 (0.2031)
13228 AB591 5.17 (0.2035)
13228 AB601 5.18 (0.2039)
13228 AB611 5.19 (0.2043)
13228 AB621 5.20 (0.2047)
13228 AB631 5.21 (0.2051)
13228 AB641 5.22 (0.2055)
13228 AB651 5.23 (0.2059)
13228 AB661 5.24 (0.2063)
13228 AB671 5.25 (0.2067)
13228 AB681 5.26 (0.2071)
13228 AB691 5.27 (0.2075)
13228 AB701 4.38 (0.1724)
13228 AB711 4.40 (0.1732)
13228 AB721 4.42 (0.1740)
13228 AB731 4.44 (0.1748)
13228 AB741 4.46 (0.1756)
13228 AB751 4.48 (0.1764)
13228 AB761 4.50 (0.1771)
13228 AB771 4.52 (0.1780)
13228 AB781 4.54 (0.1787)
13228 AB791 4.56 (0.1795)
13228 AB801 4.58 (0.1803)
13228 AB811 4.60 (0.1811)
13228 AB821 4.62 (0.1819)
13228 AB831 4.64 (0.1827)
13228 AB841 4.66 (0.1835)
13228 AB851 5.29 (0.2083)
13228 AB861 5.31 (0.2091)
13228 AB871 5.33 (0.2098)
13228 AB881 5.35 (0.2106)
13228 AB891 5.37 (0.2114)Part No. Thickness mm (in)13228 AB901 5.39 (0.2122)
13228 AB911 5.41 (0.2123)
13228 AB921 5.43 (0.2138)
13228 AB931 5.45 (0.2146)
13228 AB941 5.47 (0.2154)
13228 AB951 5.49 (0.2161)
13228 AB961 5.51 (0.2169)
13228 AB971 5.53 (0.2177)
13228 AB981 5.55 (0.2185)
13228 AB991 5.57 (0.2193)
13228 AC001 5.59 (0.2201)
13228 AC011 5.61 (0.2209)
13228 AC021 5.63 (0.2217)
13228 AC031 5.65 (0.2224)Part No. Thickness mm (in)