2004 DAEWOO LACETTI Rod

1C2 – 60I1.8L 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. Ensure that the angle at the valve face is 45 de-
grees.
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
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.

1C2 – 66I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
39. Remove the oil pump retaining bolts.
40. Remove the oil pump.
41. Mark the order of the connecting rod bearing caps.
42. Remove the connecting rod bearing cap bolts for all
of the pistons.
43. Remove the connecting rod bearing caps and the
lower connecting rod bearings.
44. Mark the order of the crankshaft bearing caps.
45. Remove the crankshaft bearing cap bolts.
46. Remove the crankshaft bearing caps and the lower
crankshaft bearings.
47. Remove the crankshaft.
48. Clean the parts, as needed.
Assembly Procedure
1. Coat the crankshaft bearings with engine oil.
2. If replacing the crankshaft, transfer the pulse pickup
sensor disc to the new crankshaft.

1C2 – 68I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
14. Apply a bead of adhesive sealing compound to the
grooves of the crankshaft bearing caps.
15. Install the crankshaft bearing caps to the engine
block.
16. Tighten the crankshaft bearing caps using new
bolts.
Tighten
Tighten the crankshaft bearing cap bolts to 50 NSm
(37 lb–ft) using a torque wrench. Use the angular
torque gauge KM–470–B to tighten the crankshaft
bearings another 45 degrees and 15 degrees.
Important : Grease the connecting rod journals and lubri-
cate the connecting rod bearings slightly so that the plastic
gauging thread does not tear when the connecting rod
bearing caps are removed.
17. Inspect all of the connecting rod bearing clearances
using a commercially available plastic gauging
(ductile plastic threads).
18. Cut the plastic gauging threads to the length of the
connecting rod bearing width. Lay them axially be-
tween the connecting rod journals and the connect-
ing rod bearings.
19. Install the connecting rod bearing caps.
Tighten
Tighten the connecting rod bearing cap bolts to 35
NSm (26 lb–ft) using a torque wrench. Use the angular
torque gauge KM–470–B to tighten the connecting
rod bearing cap bolts another 45 degrees plus 15 de-
grees.
20. Remove the connecting rod bearing caps.
21. Measure the width of the flattened plastic thread of
the plastic gauging using a ruler. (Plastic gauging is
available for different tolerance ranges.)
22. Inspect the bearing clearance for permissible toler-
ance ranges. Refer to ”Engine Specifications” in
this section.

1.8L DOHC ENGINE MECHANICAL 1C2 – 69
DAEWOO V–121 BL4
23. Install the connecting rod bearing caps to the con-
necting rods.
24. Tighten the connecting rod bearing caps using new
bolts.
Tighten
Tighten the connecting rod bearing cap bolts to 35
NSm (26 lb–ft) using a torque wrench. Use the angular
torque gauge KM–470–B to tighten the connecting
rod cap bolts another 45 degrees plus 15 degrees.
25. Install the oil pump.
26. Install the oil pump retaining bolts.
Tighten
Tighten the oil pump retaining bolts to 10 NSm (89 lb–
in).
27. Install the crankshaft bearing bridge and bolts.
Tighten
Tighten the crankshaft bearing bridge bolts to 20 NSm
(15 lb–ft) plus 45 degrees using the angular torque
gauge KM–470–B.
28. Install the crankshaft bearing bridge and oil pan
scraper bolts.
Tighten
Tighten the crankshaft bearing bridge and oil scraper
bolts to 20 NSm (15 lb–ft) plus 45 degrees using the
angular torque gauge KM–470–B.
29. Install the oil suction pipe.
30. Install the oil suction pipe and support bracket
bolts.
Tighten
Tighten the oil suction pipe bolts to 8 NSm (81 lb–in)
and oil suction pipe support bracket bolt to 6 NSm (53
lb–in) .

1C2 – 72I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
62. Install a new crankshaft rear oil seal using installer
J–36792 or KM–635.
63. Install the flywheel or flexible plate.
64. Install the flywheel or the flexible plate bolts.
Tighten
Tighten the flywheel bolts to 65 NSm (48 lb–ft). Use
the angular torque gauge KM–470–B to tighten the
flywheel bolts another 30 degrees plus 15 degrees.
For the automatic transmission, tighten the flexible
plate bolts to 45 NSm (33 lb–ft).
65. Install the engine. Refer to ”Engine” in this section.
CRANKSHAFT BEARINGS AND
CONNECTING ROD BEARINGS –
GAUGING PLASTIC
Tools Required
KM–470–B Angular Torque Gauge
Inspection Procedure – Crankshaft
1. Coat the crankshaft bearings with engine oil.
2. Install the upper crankshaft bearings into the engine
block crankshaft journals.
3. Install the lower crankshaft bearings into the crank-
shaft bearing caps.
4. Install the crankshaft.
5. Inspect the crankshaft end play with the crankshaft
bearings installed.
6. Check for permissible crankshaft end play. Refer to
”Engine Specifications” in this section.

1C2 – 74I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
Inspection Procedure – Connecting Rods
1. Coat the connecting rod bearings with engine oil.
2. Install the upper connecting rod bearings into the
connecting rod journals.
3. Install the lower connecting rod bearings into the
connecting rod bearing caps.
Important : Grease the connecting rod journals and lubri-
cate the connecting rod bearings slightly so that the plastic
gauging thread does not tear when the connecting rod
bearing caps are removed.
4. Inspect all of the connecting rod bearing clearances
using a commercially available plastic gauging
(ductile plastic threads).
5. Cut the plastic gauging threads to the length of the
bearing width. Lay them axially between the con-
necting rod journals and the connecting rod bear-
ings.
6. Install the connecting rod bearing caps.
7. Install the connecting rod bearing cap bolts.
Tighten
Tighten the connecting rod bearing cap bolts to 35
NSm (26 lb–ft). Using the angular torque gauge
KM–470–B, tighten the connecting rod bearing cap
bolts another 45 degrees plus 15 degrees.
8. Remove the connecting rod bearing caps.
9. Measure the width of the flattened plastic thread of
the plastic gauging using a ruler. (Plastic gauging is
available for different tolerance ranges.)
10. Inspect the bearing clearance for permissible toler-
ance ranges. Refer to ”Engine Specifications” in
this section.

1.8L DOHC ENGINE MECHANICAL 1C2 – 75
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 coolant 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 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 crankshaft ro-
tates, the oil pump 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 required for lubrication of the engine.
The oil pressure regulator prevents too much oil from en-
tering the engine lubrication passages. During normal oil
supply, a coil spring and valve keep the bypass closed, di-
recting 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 aluminum.
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 cylinder head. In one
path, the oil is pumped through oil passages in the crank-
shaft to the connecting rods, then to the pistons and cylin-
ders. It then drains back to the oil pan. In the second path,
the oil is pumped through passages to the camshaft. The
oil passes through the internal passageways in the cam-
shafts 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
utilizes an inertial supercharging effect to improve engine
torque at low and moderate speeds.
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 cyl-
inder head are drilled for 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 precisely open and
close the intake and the exhaust valves the correct
amount at the correct time. The camshaft lobes are oiled
by splash action from pressurized oil escaping from the
camshaft journals.

ENGINE ELECTRICAL 1E – 3
DAEWOO V–121 BL4
FASTENER TIGHTENING SPECIFICATIONS
ApplicationNSmLb–FtLb–In
Battery Cable Nuts5–44
Battery Carrier Tray Lower, Side and Upper Bolts2015–
Battery Retainer Clamp–to–Battery Rod Nuts5–44
Generator Drive End Bearing Nut8160–
Generator Lower Bracket–to–Engine Block Bolts (1.8L Engine)3727–
Generator Lower Bracket–to–Generator Nut (1.4L/1.6L Engine)2518–
Generator Through–Bolts10–89
Generator–to–Intake Manifold and Cylinder Head Support
Bracket Bolts (1.8L Engine)3727–
Generator–to–Intake Manifold Strap Bracket Bolt (1.8L Engine)2216–
Generator Upper Support Bracket Bolt (1.4L/1.6L Engine)2015–
Intake Manifold–to–Cylinder Body Strap Bracket Bolts (Over
Starter)2216–
Starter Field Connector Nut12–106
Starter Lower Mounting Stud Ground Wire Nut12–106
Starter Mounting Studs/Nuts (1.4L/1.6L Engine)2518–
Starter Solenoid Assembly Screws8–71
Starter Solenoid Terminal–to–Battery Cable Terminal Nut5.5–49
Starter Solenoid Terminal–to–Ignition Solenoid Terminal Nut5.5–49
Starter Through–Bolts6–53
Starter–to–Engine Block Mounting Bolt (1.8L Engine)4533–
Starter–to–Engine Transaxle Mounting Bolt (1.8L Engine)5037–