egr valve DAEWOO LACETTI 2004 Service Repair Manual

1.4L/1.6L DOHC ENGINE MECHANICAL 1C1 – 9
DAEWOO V–121 BL4
COMPONENT LOCATOR
CYLINDER HEAD
1. Oil Filler Cap
2. Engine Cover
3. Camshaft Cover
4. Camshaft Cover Gasket
5. Camshaft Cover Bolt
6. Hydraulic Tappet Adjuster
7. Valve Key
8. Valve Spring Cap
9. Valve Spring
10. Valve Stem Seal
11. EGR Vaccum Hose
12. EGR Valve
13. EGR Valve Gasket
14. EGR Valve Adaptor
15. EGR Valve Adaptor Gasket16. Cylinder Head
17. Front Camshaft Cap
18. Valve Guide
19. Plug
20. Freeze Plug
21. Oil Duct Cap
22. Intake Valve
23. Exhaust Valve
24. Cylinder Head Gasket
25. Engine Coolant Temperature Sensor
26. Heat Take Off Pipe
27. Camshaft
28. Camshaft Seal
29. Thermostat

1.4L/1.6L DOHC ENGINE MECHANICAL 1C1 – 25
DAEWOO V–121 BL4
34. Remove the intake/exhaust manifold. Refer to ”In-
take/Exhaust Manifold” in the section.
35. Remove the cylinder head bolts gradually in the
sequence shown and remove the cylinder head.
Notice : Prevent any engine oil or coolant from entering
the cylinders when removing the cylinder head.
36. Remove the cylinder head gasket.
Cleaning Procedure
1. Clean the gasket sitting surfaces of the cylinder
head and the engine block.
2. Make sure the gasket sitting surfaces of the cylin-
der head and the engine block are free of nicks and
heavy scratches.
3. Clean the cylinder head bolts.
4. Inspect the cylinder head for warpage. Refer to
”Cylinder Head and Valve Train Components” in
this section.
Installation Procedure
1. Install the new cylinder head gasket.
2. Install the intake/exhaust manifold to the cylinder
head. Refer to ”Intake/Exhaust Manifold” in the
section.
3. Install the cylinder head bolts gradually in the se-
quence shown.
Tighten
Tighten the cylinder head bolts to 25 NSm (18 lb–ft)
and retighten the cylinder head bolts 70 degrees plus
70 degrees plus 50 degrees using the angular torque
gauge KM–470–B.
4. Install the right engine mount. Refer to ”Engine
Mount” in this section.

1.4L/1.6L DOHC ENGINE MECHANICAL 1C1 – 59
DAEWOO V–121 BL4
15. Remove the direct ignition system (DIS) coil mount-
ing bolts.
16. Remove the DIS coil with the ignition wires at-
tached.
17. Remove the DIS coil mounting bracket bolts.
18. Remove the DIS coil mounting bracket.
19. Remove the electrical exhaust gas recirculation
(EEGR) valve adapter bolts.
20. Remove the EEGR valve adapter.
21. Remove the EEGR valve adapter gasket.
22. Remove the spark plugs.
23. Remove the camshaft cap bolts gradually and in
the sequence shown for each camshaft cap.
24. Remove the intake camshaft caps. Maintain the
correct positions for installation.
25. Remove the intake camshaft.
26. Remove the intake valve tappet adjusters.
27. Remove the exhaust camshaft caps. Maintain the
correct positions for installation.
28. Remove the exhaust camshaft.
29. Remove the exhaust valve tappet adjusters.
30. Compress the valve springs with the valve spring
compressor KM–348 and the adapter KM–653.
31. Remove the valve keys.
32. Remove the valve spring compressor KM–348 and
the adapter KM–653.
33. Remove the valve spring caps.
34. Remove the valve springs. Maintain the original
position of the valve springs for installation.

1C1 – 62I1.4L/1.6L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
Valve Grind
1. Ensure that there are no crater line burns on the
valve cone.
2. The valve may be reground only two times. Do not
grind the valve stem end.
3. The angle at the valve face is 45 degrees.
4. Inspect the assembly height of the intake valves
and the exhaust valves.
Valve Guide – Ream
1. Measure the diameter of the valve guide using the
gauge MKM–571–B and a commercially available
inside micrometer.
Important : Valve oversizes may already have been fitted
in production.
2. An oversize service code is on the valve guide and
the valve stem end. The following table gives the
correct size, reamer, and production code for each
service.
Size
ReamerProduction
CodeService
Code
Normal––K
0.075KM–8051K1
0.150–2K2
3. Ream the valve guide from the upper side of the
cylinder head to the next oversize.
4. After reaming, cross out the code and emboss the
valve guide with the new code.
Valve Seat – Cut
1. Place the cylinder head on wooden blocks.
2. Cut the intake and the exhaust valve seats using
the guide drift KM–340–7 as follows:
S Valve seat – A 45–degree surface using the cut-
ter KM–340–13.
S Upper correction angle – A 30–degree surface
using the cutter KM–340–13.
S Lower correction angle – A 60–degree surface
using the cutter KM–340–26.
3. Clean the chippings from the cylinder head.

1C1 – 64I1.4L/1.6L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
11. Install the intake camshaft.
12. Install the intake camshaft caps in their original
positions.
13. Install the exhaust camshaft.
14. Install the exhaust camshaft caps in their original
positions.
15. Install the camshaft cap bolts.
16. Tighten the camshaft cap bolts gradually and in the
sequence shown for each camshaft cap.
Tighten
Tighten the camshaft cap bolts to 16 NSm (12 lb–ft).
17. Install the spark plugs.
Tighten
Tighten the spark plugs to 25 NSm (18 lb–ft).
18. Install the EGR valve adapter gasket.
19. Install the EGR valve adapter.
20. Install the EGR valve adapter bolts.
Tighten
Tighten the exhaust gas recirculation valve adapter
bolts to 25 NSm (18 lb–ft).
21. Install the DIS coil mounting bracket.
22. Install the DIS coil mounting bracket bolts.
Tighten
Tighten the direct ignition system coil mounting brack-
et bolts to 10 NSm (89 lb–in).
23. Install the DIS coil with the ignition wires attached.
24. Install the DIS coil mounting bolts.
Tighten
Tighten the direct ignition system coil mounting bolts
to 10 NSm (89 lb–in).
25. Install the intake manifold studs.
26. Install the intake manifold.
27. Install the intake manifold retaining nuts and retain-
ing bolts in the sequence shown.
Tighten
Tighten the intake manifold retaining nuts and retain-
ing bolts to 25 NSm (18 lb–ft).

1.4L/1.6L DOHC ENGINE MECHANICAL 1C1 – 77
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
CYLINDER HEAD AND GASKET
The cylinder head is made of an aluminum alloy. The cylin-
der head uses cross–flow intake and exhaust ports. A
spark plug is located in the center of each combustion
chamber. The cylinder head houses the dual camshafts.
CRANKSHAFT
The crankshaft has eight integral weights which are cast
with it for balancing. Oil holes run through the center of the
crankshaft to supply oil to the connecting rods, the bear-
ings, the pistons, and the other components. The end
thrust load is taken by the thrust washers installed at the
center journal.
TIMING BELT
The timing belt coordinates the crankshaft and the dual
overhead camshafts and keeps them synchronized. The
timing belt also turns the water pump. The timing belt and
the pulleys are toothed so that there is no slippage be-
tween them. There are two idler pulleys. An automatic ten-
sioner pulley maintains the timing belt’s correct tension.
The timing belt is made of a tough reinforced rubber similar
to that used on the serpentine accessory drive belt. The
timing belt requires no lubrication.
OIL PUMP
The oil pump draws engine oil from the oil pan and feeds
it under pressure to the various parts of the engine. An oil
strainer is mounted before the inlet of the oil pump to re-
move impurities which could clog or damage the oil pump
or other engine components. When the drive gear rotates,
the driven gear rotates. This causes the space between
the gears to constantly open and narrow, pulling oil in from
the oil pan when the space opens and pumping the oil out
to the engine as it narrows.
At high engine speeds, the oil pump supplies a much high-
er amount of oil than is required for lubrication of the en-
gine. The oil pressure regulator prevents too much oil from
entering the engine lubrication passages. During normal
oil supply, a coil spring and valve keep the bypass closed,
directing all of the oil pumped to the engine. When the
amount of oil being pumped increases, the pressure be-
comes high enough to overcome the force of the spring.This opens the valve of the oil pressure regulator, allowing
the excess oil to flow through the valve and drain back to
the oil pan.
OIL PAN
The engine oil pan is mounted to the bottom of the cylinder
block. The engine oil pan houses the crankcase and is
made of cast metal.
Engine oil is pumped from the oil pan by the oil pump. After
it passes through the oil filter, it is fed through two paths
to lubricate the cylinder block and the cylinder head. In one
path, the oil is pumped through the oil passages in the
crankshaft to the connecting rods, then to the pistons and
the cylinders. It then drains back to the oil pan. In the sec-
ond path, the oil is pumped through the oil passages to the
camshaft. The oil passes through the internal passage-
ways in the camshafts to lubricate the valve assemblies
before draining back to the oil pan.
EXHAUST MANIFOLD
A single four–port, rear–takedown manifold is used with
this engine. The manifold is designed to direct escaping
exhaust gases out of the combustion chambers with a
minimum of back pressure. The oxygen sensor is
mounted to the exhaust manifold.
INTAKE MANIFOLD
The intake manifold has four independent long ports and
uses inertial supercharging to improve engine torque at
low and moderate speeds. The plenum is attached to the
intake manifold.
CAMSHAFTS
This engine is a dual overhead camshaft (DOHC) type,
which means there are two camshafts. One camshaft op-
erates the intake valves, and the other camshaft operates
the exhaust valves. The camshafts sit in journals on the
top of the engine in the cylinder head and are held in place
by camshaft caps. The camshaft journals of the cylinder
head are drilled to create oil passages. Engine oil travels
to the camshafts under pressure where it lubricates each
camshaft journal. The oil returns to the oil pan through
drain holes in the cylinder head. The camshaft lobes are
machined into the solid camshaft to open and close the in-
take and the exhaust valves precisely the correct amount
at the correct time. The camshaft lobes are oiled by splash
action from pressurized oil escaping from the camshaft
journals.

1.8L DOHC ENGINE MECHANICAL 1C2 – 17
DAEWOO V–121 BL4
53. Remove the generator–to–intake manifold support
bracket bolts at the cylinder head and the intake
manifold.
54. Remove the generator support bracket.
55. Remove the intake manifold–to–generator strap
bracket bolt and loosen the bolt on the generator.
56. Move the strap clear of the intake manifold.
57. Remove the charcoal canister purge (CCP) and
EGR solenoid bracket bolt and move the bracket
clear.
58. Disconnect the throttle cable at the throttle body
and the intake manifold.
59. Loosen all of the cylinder head bolts gradually and
in the sequence shown.
60. Remove the cylinder head bolts.
61. Remove the cylinder head with the intake manifold
and the exhaust manifold attached.
Notice : Prevent any engine oil or coolant from entering
the cylinders when removing the cylinder head.
62. Remove the cylinder head gasket.
Cleaning Procedure
1. Clean the gasket surfaces of the cylinder head and
the engine block.
2. Make sure the gasket surfaces of the cylinder head
and the engine block are free of nicks and heavy
scratches.
3. Clean the cylinder head bolts.
4. Inspect the cylinder head for warpage. Refer to
”Cylinder Head and Valve Train Components” in
this section.
Installation Procedure
1. Install the cylinder head gasket.
2. Install the cylinder head with the intake manifold
and the exhaust manifold attached.
3. Install the cylinder head bolts.
4. Tighten the cylinder head bolts gradually and in the
sequence shown.

1C2 – 22I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
56. Connect the CTS connector.
57. Connect the engine CTS connector.
58. Connect the IAC valve connector.
59. Connect the TPS connector.
60. Install the CCP and the EGR solenoid bracket bolt.
Tighten
Tighten the charcoal canister purge and exhaust gas
recirculation solenoid bracket bolt to 5 NSm (44 lb–in).
61. Connect the DIS coil connector.
62. Connect the O2 sensor connector, if equipped.
63. Connect the ECM ground terminal.
64. Install the fuel pump fuse.
65. Connect the negative battery ground cable.
66. Refill the engine cooling system. Refer to Section
1D, Engine Cooling.
CAMSHAFTS
Removal Procedure
1. Remove the timing belt. Refer to ”Timing Belt” in
this section.
2. Disconnect the breather tube at the camshaft cov-
er.
3. Disconnect the engine ventilation hose at the cam-
shaft cover.
4. Remove the spark plug cover bolts.
5. Remove the spark plug cover.
6. Disconnect the ignition wires from the spark plugs.
7. Remove the camshaft cover bolts.
8. Remove the camshaft cover washers.
9. Remove the camshaft cover and the camshaft cov-
er gasket.
Notice : Take extreme care to prevent any scratches,
nicks or damage to the camshafts.
10. While holding the intake camshaft firmly in place,
remove the intake camshaft gear bolt.
11. Remove the intake camshaft gear.
12. While holding the exhaust camshaft firmly in place,
remove the exhaust camshaft gear bolt.
13. Remove the exhaust camshaft gear.

1.8L DOHC ENGINE MECHANICAL 1C2 – 41
DAEWOO V–121 BL4
14. Connect the MAP sensor connector.
15. Connect the coolant hoses to the throttle body.
16. Connect the IAC valve connector.
17. Connect the TPS connector.
18. Connect the air cleaner outlet hose to the throttle
body.
19. Connect the MAT sensor connector.
20. Connect the CCP and EGR solenoid at the intake
manifold and tighten the bracket bolt.
Tighten
Tighten the charcoal canister purge and exhaust gas
recirculation solenoid bracket bolt to 5 NSm (44 lb–in).
21. Install the fuel pump fuse.
22. Connect the negative battery cable.
23. Refill the engine cooling system. Refer to Section
1D, Engine Cooling.
EXHAUST MANIFOLD
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the oxygen (O2) sensor connector, if
equipped.
3. Remove the exhaust manifold heat shield bolts.
4. Remove the exhaust manifold heat shield.
5. Remove the exhaust flex pipe retaining nuts from
the exhaust manifold studs.

1.8L DOHC ENGINE MECHANICAL 1C2 – 57
DAEWOO V–121 BL4
15. Remove the direct ignition system (DIS) coil and
the exhaust gas recirculation (EGR) mounting
bracket bolts.
16. Remove the DIS ignition coil and the EGR mount-
ing bracket and ignition wires.
17. Remove the intake manifold studs.
18. Remove the spark plugs.
19. Remove the camshaft bearing cap bolts gradually
and in the sequence shown for each camshaft cap.
20. Remove the intake camshaft caps. Maintain the
correct positions for installation.
21. Remove the intake camshaft.
22. Remove the intake valve tappet adjusters.
23. Remove the exhaust camshaft caps. Maintain the
correct positions for installation.
24. Remove the exhaust camshaft.
25. Remove the exhaust valve tappet adjusters.
26. Compress the valve springs with the valve spring
compressor KM–348 and the adapter KM–653.
27. Remove the valve retainers.
28. Remove the valve spring compressor KM–348 and
the adapter KM–653.
29. Remove the valve spring caps.
30. Remove the valve springs. Maintain the original
position of the valve springs for installation.