Engine DAEWOO MATIZ 2003 Service Owner's Manual

1B –4 SOHC ENGINE MECANICAL
DAEWOO M-150 BL2
TIMING BELT AND PULLEY
The timing belt connects the camshaft timing pulley (w)
and the crankshaft timing pulley (x). The timing belt
coordinates the crankshaft and the camshaft and keeps
them synchronized. The timing belt also turns the cool-
ant pump (y). The timing belt and the pulleys are toothed
so that there is no slippage between them. There is a
tension pulley (z) that maintains the correct timing belt
tension. The timing belt is made of a tough reinforced
rubber similar to that used on the serpentine drive belt.
The timing belt requires no lubrication.
D102B006
ENGINE MOUNT
This is to absorb or reduce the engine vibration and im-
pact from the wheeled road. Engine mount is attached to
the engine–front side, the engine-right side and the en-
gine-rear side and one transaxle mount is attached to
the transaxle side.
D102B007
D102B008

SOHC ENGINE MECANICAL 1B–5
DAEWOO M-150 BL2
COMPONENT LOCATOR
CYLINDER HEAD
D12B4011
1 Oil Filler Cap
2 Cylinder Head Cover
3 Cylinder Head Cover (Euro III)
4 Distributor Case
5 Camshaft
6 Exhaust Rocker Arm7 Cylinder Head Gasket
8 Cylinder Head
9 Intake Rocker Arm
10 Exhaust Valve
11 Intake Valve

1B –6 SOHC ENGINE MECANICAL
DAEWOO M-150 BL2
ENGINE BLOCK
D21B0011
1 Oil Level Gauge Stick
2Piston
3 Connecting Rod
4 Engine Block
5 Oil Filter6 Flywheel
7 Crankshaft
8 Oil Pan
9 Oil Pump Strainer
10 Oil Pump Assembly

SOHC ENGINE MECANICAL 1B–7
DAEWOO M-150 BL2
MANIFOLD & AIR FLOW SYSTEM
D21B0021
1 Intake Manifold
2 Exhaust Gas Recirculation (EGR) Pipe
3 Exhaust Gas Recirculation (EGR) Valve and
Solenoid
4 Throttle Body Assembly
5 Air Filter Assembly
6 Resonator7 Snorkel
8 Oxygen Sensor
9 Exhaust Manifold
10 Exhaust Manifold Heat Shield
11 Exhaust Manifold Heat Shield (Euro III)
12 Exhaust Manifold (Euro III)

1B –8 SOHC ENGINE MECANICAL
DAEWOO M-150 BL2
TIMING BELT & ENGINE MOUNT
D12B4041
1 Engine Mount Damping Block
2 Engine Mount Intermediate Bracket
3 Engine Mount Brace Bracket
4 Transaxle Mount Bracket
5 Transaxle Mount Damping Block
6 Engine Mount Front Bracket
7 Engine Mount Front Damping Bush
8 Timing Belt9 Timing Belt Tensioner
10 Crankshaft Gear
11 Timing Belt Upper Front Cover
12 Timing Belt Lower Front Cover
13 Crankshaft Pulley
14 Engine Mount Lower Bracket
15 Engine Mount Upper Bracket

SOHC ENGINE MECANICAL 1B–9
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURE
COMPRESSION PRESSURE CHECK
Tools Required
09915–64510 Compression Pressure Gauge
Check the compression pressure in the following proce-
dures:
1. Warm up the engine to the normal operating tempera-
ture (Cooling temperature : 80–90C (176–194F)).
2. Stop the engine and then remove the high tension
cable and the spark plug.
3. Disconnect the distributor optical sensor connector.
4. Install the compression pressure gauge 09915–64510
(a) in the hole of spark plug.
D12B301A
5. Disengage the clutch in Neutral (to lighten starting
load on engine upon cranking), and depress the ac-
celerator all the way to make the throttle fully open.
6. Crank the engine with the starting motor, and read the
highest pressure on the compression pressure gauge.
The difference of measured value between cylinders
is 98.06kPa (14.22 psi) and less.
On checking, make the connection perfectly airtight
between the hole of spark plug and compression pres-
sure gauge.
Unit Standard Limit



Compression
Pressure
– 400 rpm
kPa(psi)1,225.75
(177.73)
1,176.72–
1,274.78
(170.62–
184.84)
7. After checking, remove the gauge and install the re-
moved parts.
OIL PRESSURE CHECK
Tools Required
09915–77310 Oil Pressure Gauge
Prior to check oil pressure, check the followings:
Check oil level and add if required.
Replace the discolored, deteriorated or diluted oil.
Check any oil leakage and repair the defective parts.
Check the compression pressure in the following proce-
dures:
1. Remove the oil pressure switch (b) from the cylinder
block.
2. Install the oil pressure gauge 09915–77310 (c) to the
mounting place of the oil pressure switch.
D12B302A
3. Start the engine and warm up to the normal operating
temperature.
4. Raise the engine speed up to 2,000rpm and then
read oil pressure.
Item Unit Standard
Oil Pressure – 2000rpmkPa
(psi)245.15–294.18
(35.55–42.66)
5. After checking, wrap the threads of oil pressure
switch with a seal tape and tighten it to the specified
torque 12–16 N
m (106–144 lb-in).
6. Start the engine and check oil pressure switch for oil
leakage.

1B –10 SOHC ENGINE MECANICAL
DAEWOO M-150 BL2
ADJUSTMENT OF VALVE
CLEARANCE
Adjust the valve clearance in the following procedures:
1. Remove the air filter/resonator assembly and the
relevant parts installed on the cylinder head cover.
2. Remove the cylinder head cover hexagon bolts and
remove the cover.
3. Turn over the crankshaft to make No.1 cylinder
matched with the compression top dead center.
(When the camshaft sprocket notch (d) is aligned with
the timing belt rear cover triangle pointer (e) and the
crankshaft sprocket point (f) is aligned with the oil
pump housing point (g), the compression top dead
center is on the ignition sequence for No. 1 cylinder.)
D102B303
4. Check the valve clearance for No. 1 cylinder com-
pression top dead center.

Condition

Cylinder
No.

1

2

3

Compression topIntake
dead center of
No.1 cylinder
Exhaust

marks indicates the place where the valve clear-
ance can be checked and adjusted.
5. If the checking for the valve clearance of No.1 cylin-
der compression top dead center is over, position
No.1 cylinder on the exhaust top dead center as rotat-
ing the crankshaft in a 360–degree arc. (When the
camshaft sprocket point (h) is aligned with the timing
belt rear cover triangle pointer (e), the exhaust top
dead center is on the ignition sequence for No. 1 cyl-
inder.)
D102B304
6. Check the valve clearance for the No. 1 cylinder ex-
haust top dead center.

Condition

Cylinder
No.

1

2

3

Exhaust top deadIntake
center of No.1
cylinder
Exhaust

marks indicates the place where the valve clear-
ance can be checked and adjusted.
Check and adjust the valve clearance (i) using thick-
ness gauge (j).
D102B305
D102B306

SOHC ENGINE MECANICAL 1B–11
DAEWOO M-150 BL2
The measured value of valve clearance should meet the
specified value. If not, adjust the valve clearance.
Important: In case of hot engine, warm up the engine
until the electric cooling fan begins to work and stop the
engine to adjust the clearance with 20–30 minutes there
from.
Unit : mm (in.)
Item Specified value

Intake0.15±0.02
(0.0059±0.0008)

Valve
Cold
Exhaust0.32±0.02
(0.0126±0.0008)


Valve
Clearance
Intake0.25±0.02
(0.0098±0.0008)


Hot
Exhaust0.42±0.02
(0.0165±0.0008)
8. When adjusting the valve clearance, loosen the ad-
just nut (k) and then tighten or loosen the adjust rod (l)
properly.
D102B307
IGNITION TIMING CHECK AND
ADJUSTMENT (TYPICAL)
Note: Ignition timing could not be adjusted for Direct
Ignition System (Euro Stage III).
Check and adjust the ignition timing in the following pro-
cedures:
1. Warm up the engine to the normal operating tempera-
ture.
2. Turn off the lamp and audio system and shift the shift
gear lever in Neutral.
D12B3081
3. Connect terminal A and terminal C of ALDL connec-
tor using the wire (m) or connect the scan tool (n) with
ALDL connector.
4. Connect the timing light (o) with No. 1 cylinder high
tension cable and check the specified value for the
ignition timing, flashing notch on the crankshaft
pulley.
Item Specified Value
Ignition timing – 950rpm10 BTDC
Important: In flashing the timing light, if crankshaft
pulley notch (p) is matched with the mark (10) for timing
check, the ignition timing is 10 BTDC.
D102B309

1B –12 SOHC ENGINE MECANICAL
DAEWOO M-150 BL2
D102B310
5. If the ignition timing exceeds the specified value,
loosen the distributor bolts and adjust it to the speci-
fied ignition timing by turning the distributor body (s).
D102B311
VA LV E T I M I N G C H E C K A N D
ADJUSTMENT
Check the valve timing in the following procedures:
1. After removing the high headlamp, loosen the bolts
(a) and remove the timing belt front upper cover (b).
D102B312
2. Turning the crankshaft clockwise twice, align the
notch (d) on the crankshaft pulley (c) with the mark 0
(e) for the timing check on the timing belt front lower
cover.
D102B313
3. Check if the notch (f) on the camshaft sprocket is
aligned with the triangle pointer (g) on the timing belt
rear cover.
Important: Notch (f) should be aligned with pointer (g)
to set the valve timing normally.
D102B314

SOHC ENGINE MECANICAL 1B–13
DAEWOO M-150 BL2
Adjust the valve timing in the following procedures:
1. Loosen the bolt and remove the timing belt pulley (c).
In loosening the bolt, use the driver (h) in the picture
shown.
D102B315
2. Remove the oil level gauge guide tube (i) and the tim-
ing belt front lower cover (j).
D102B316
3. Remove the timing belt tensioner (k) and the timing
belt (l).
D102B317
4. Using the bolt, turn the crankshaft clockwise to align
the mark (m) on the crankshaft sprocket with the
pointer (n) on the oil pump housing. Then, turn the
camshaft to align the notch (f) with the pointer (g).
D102B318
5. Install the timing belt (l) and the tensioner (k). (Do not
tighten the tensioner bolt completely.)
Turning the crankshaft clockwise twice, align the
mark (m) with the pointer (n) and tighten the tensioner
bolt to 15–23 N
m (11–17 lb-ft).
D12B319A
6. Install all removed parts.