Page 897 of 2870

ME(H4SO)-28
MECHANICAL
Intake Manifold Vacuum
5. Intake Manifold Vacuum
A: INSPECTION
1) Warm-up the engine.
2) Disconnect the brake vacuum hose from intake
manifold, and then install the vacuum gauge.
3) Keep the engine at 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 in-
Hg)
ME-00195
Diagnosis of engine condition by measurement of intake 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.Air 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.Exhaust 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
Page 898 of 2870

ME(H4SO)-29
MECHANICAL
Engine Oil Pressure
6. Engine Oil Pressure
A: INSPECTION
1) Disconnect the ground cable from battery.
2) Remove the generator from bracket.
SC(H4SO)-15, REMOVAL, Generator.>
3) Disconnect the connector from oil pressure
switch.
4) Remove the oil pressure switch from cylinder
block.
sure Switch.>
5) Connect the oil pressure gauge hose to cylinder
block.
6) Connect the battery ground cable to battery.
7) Start the engine, and then measure the oil pres-
sure.
Oil pressure:
Standard:
88 kPa (0.9 kg/cm
2, 13 psi) or more at 800 rpm
294 kPa (3.0 kg/cm2, 43 psi) or more at 5,000
rpmCAUTION:
If the oil pressure is out of specification,
check the oil pump, oil filter and lubrication
line.
gine Lubrication System Trouble in General.>
If the oil pressure warning light is turned ON
and oil pressure is in specification, replace the
oil pressure switch.
SPECTION, Engine Lubrication System Trouble
in General.>
NOTE:
The specified data is based on an engine oil tem-
perature of 80°C (176°F).
8) 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)
9) Install the generator and V-belt in the reverse or-
der of removal, and then adjust the V-belt deflec-
tion.
belt.>
FU-00009
FU-00009
ME-00196
Page 899 of 2870

ME(H4SO)-30
MECHANICAL
Fuel Pressure
7. Fuel Pressure
A: INSPECTION
WARNING:
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.
47, RELEASING OF FUEL PRESSURE, OPERA-
TION, Fuel.>
2) Open the fuel flap lid, and then remove the fuel
filler cap.
3) Disconnect the fuel delivery hoses from fuel
damper, 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 kg/cm
2, 41 — 46 psi)
7) After connecting the pressure regulator vacuum
hose, measure the fuel pressure.
Fuel pressure:
Standard:
206 — 235 kPa (2.1 — 2.4 kg/cm
2, 30 — 34 psi)
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kg/cm
2, 1 to 3 psi) higher than standard val-
ues during high-altitude operations.
FU-00208
FU-00262
ME-00198
ME-00198
Page 900 of 2870

ME(H4SO)-31
MECHANICAL
Valve Clearance
8. Valve Clearance
A: INSPECTION
NOTE:
Inspection and adjustment of the valve clearance
should be performed while engine is cold.
1) Set the vehicle on a lift.
2) Lift-up the vehicle.
3) Remove the under cover.
4) Lower the vehicle.
5) Disconnect the ground cable from battery.
6) Remove the belt cover (LH).
7) When inspecting the #1 and #3 cylinders:
(1) Disconnect the spark plug cords from spark
plugs RH side.
REMOVAL, Spark Plug.>
(2) Disconnect the PCV hose from rocker cover
(RH).
(3) Remove the bolts, and then remove the
rocker cover (RH).
8) When inspecting the #2 and #4 cylinders:
(1) Disconnect the spark plug cords from spark
plugs (LH Side)
REMOVAL, Spark Plug.>
(2) Disconnect the PCV hose from rocker cover
(LH).
(3) Remove the bolts, and then remove the
rocker cover (LH).
9) Set the #1 cylinder piston to top dead center of
compression stroke by rotating crank pulley clock-
wise using a socket wrench.NOTE:
When arrow mark (A) on the cam sprocket (LH)
comes exactly to the top, #1 cylinder piston is
brought to the top dead center of compression
stroke.
10) Measure the #1 cylinder valve clearance by us-
ing thickness gauge.
CAUTION:
Insert the thickness gauge (A) in as horizon-
tal a direction as possible with respect to the
valve stem end face.
Measure the exhaust valve clearances while
lifting-up the vehicle.
Valve clearance (Standard):
Intake;
0.20
±0.04 mm (0.0079±0.0016 in)
Exhaust;
0.25
±0.04 mm (0.0098±0.0016 in)
11) If necessary, adjust the valve clearance.
to ME(H4SO)-32, ADJUSTMENT, Valve Clear-
ance.>
12) Similar to measurement procedures used for
#1 cylinder, measure the #2, #3 and #4 cylinder
valve clearances.
NOTE:
Be sure to set the cylinder pistons to their re-
spective top dead centers on compression stroke
before measuring valve clearances.
FU-00009
ME-00199
ME-00200
(A)
ME-00201
(A)
Page 901 of 2870

ME(H4SO)-32
MECHANICAL
Valve Clearance
To set the #3, #2 and #4 cylinder pistons to their
top dead centers on compression stroke, turn the
crank pulley clockwise 90° at a time starting with ar-
row mark on cam sprocket (LH) facing up.
13) After inspection, install the related parts in the
reverse order of removal.
Tightening torque:
Resonator chamber;
33 N
⋅m (3.4 kgf-m, 25 ft-lb)
B: ADJUSTMENT
NOTE:
Adjustment of the valve clearance should be per-
formed while engine is cold.
1) Set the #1 cylinder piston to top dead center of
compression stroke by rotating crank pulley clock-
wise using socket wrench.
NOTE:
When arrow mark (A) on the cam sprocket (LH)
comes exactly to the top, #1 cylinder piston is
brought to the top dead center of compression
stroke.2) Adjust the #1 cylinder valve clearance.
(1) Loosen the valve rocker nut and screw.
(2) Place suitable thickness gauge.
(3) While noting the valve clearance, tighten the
valve rocker adjusting screw.
(4) When specified valve clearance is obtained,
tighten the valve rocker nut.
Tightening torque:
10 N
⋅m (1.0 kgf-m, 7.2 ft-lb)
CAUTION:
Insert the thickness gauge in as horizontally
as possible with respect to the valve stem end
face.
Adjust the exhaust valve clearances while
lifting up the vehicle.
Valve clearance:
Intake:
0.20
±0.04 mm (0.0079±0.0016 in)
Exhaust:
0.25
±0.04 mm (0.0098±0.0016 in)
3) Ensure the valve clearances are within specifi-
cations.
4) Turn the crankshaft two complete rotations until
#1 cylinder piston is again set to the top dead cen-
ter of compression stroke.
5) Ensure the valve clearances are within specifi-
cations. If necessary, readjust the valve clearanc-
es.
6) Similar to adjustment procedures used for #1
cylinder, adjust the #2, #3 and #4 cylinder valve
clearances.
ME-00202
#1
#2#3 #4
IN-00044
ME-00200
(A)
ME-00203
Page 902 of 2870
ME(H4SO)-33
MECHANICAL
Valve Clearance
NOTE:
Be sure to set the cylinder pistons to their re-
spective top dead centers on compression stroke
before adjusting valve clearances.
To set the #3, #2 and #4 cylinder pistons to their
top dead centers of compression stroke, turn the
crank pulley clockwise 90° at a time starting with ar-
row mark on cam sprocket (LH) facing up.
ME-00202
#1
#2#3 #4
Page 903 of 2870
ME(H4SO)-34
MECHANICAL
Engine Assembly
9. Engine Assembly
A: REMOVAL
1) Set the vehicle on lift arms.
2) Open the front hood fully, and then support with
the front hood stay.
3) Release the fuel pressure.
47, RELEASING OF FUEL PRESSURE, OPERA-
TION, Fuel.>
4) Disconnect the A/C pressure hoses from A/C
compressor.
5) Remove the fuel filler cap.
6) Disconnect the ground cable from battery.
7) Remove the air intake duct and air cleaner case.
Case.>
8) Remove the under cover.
9) Remove the radiator from vehicle.
CO(H4SO)-28, REMOVAL, Radiator.>
10) Remove the air cleaner case stay.
MT model
AT model11) Disconnect the following connectors and ca-
bles.
(1) Front oxygen (A/F) sensor connector
(2) Rear oxygen sensor connector
(3) Engine ground cable
FU-00009
ME-00204
ME-00205
EX-00029
EX-00030
ME-00206
Page 904 of 2870
ME(H4SO)-35
MECHANICAL
Engine Assembly
(4) Engine harness connectors
(5) Generator connector, terminal and A/C
compressor connector
(6) Accelerator cable (A) and cruise control ca-
ble (B)(7) Pressure switch
12) Disconnect the following hoses.
(1) Brake booster vacuum hose
(2) Heater inlet and outlet hose
(3) Heater inlet and outlet hose (with ATF
warmer model)
13) Remove the power steering pump from brack-
et.
(1) Remove the resonator chamber.
(A) Generator connector and terminal
(B) A/C compressor connector
ME-00207
ME-00208
(A)
(B)
(B)(A)
ME-00328
FU-00017
ME-00329
ME-00330
ME-02009