2004 DAEWOO LACETTI Rod

1C2 – 2I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
SPECIFICATIONS
ENGINE SPECIFICATIONS
ApplicationDescription
General Data:
Engine Type1.8L DOHCT18SED
Displacement1.8L DOHC1,799 cm3 (109.7 in3)
Bore Stroke1.8L DOHC81.6 x 86 mm (3.21 in. x 3.38 in.)
Compression Ratio9.6 ± 0.02:1
Firing Oder1–3–4–2
Cylinder Bore:
Diameter1.8L DOHC81.575~81.625 mm (3.2116~3.2135 in.)
Out of Round (Maximum)0.013 mm (0.0005 in.)
Taper (Maximum)0.013 mm (0.0005 in.)
Pistion:
Diameter1.8L DOHC81.575~82.105 mm (3.2115~3.2325 in.)
Clearance to Bore0.0100~0.0300 mm (0.00039~0.00110 in.)
Piston Protrusion0.5 mm (0.019 in.) Maximum
Piston Taper0.013 (0.0005 in.)
Piston Rings:
Ring, End Gap: Top Compression0.3~0.5 mm (0.011~ 0.019 in.)
Ring, End Gap: Second Compression0.3~0.5 mm (0.011~0.019 in.)
Piston Pin:
Diameter20.9970~20.9985 mm (0.82665~0.82671 in.)
Pin Offset0.8 mm (0.03 in.) Towards Thrust Side
Clearance: In Piston0.0035~0.0140 mm (0.00013~0.00055 in.)
Clearance: In RodInterference Fit in Rod
Length61.5 mm (2.42 in.)
Camshaft:
Lift – Intake9.2 mm (0.36 in.)
Lift – Exhaust9.2 mm (0.36 in.)
End Play0.040~0.14 mm (0.0015~0.0055 in.)
Bearing Journal OD42.455~43.470 mm (1.6714~1.7114 in.)
Crankshaft:
Main Journal:
Diameter (All)
Out of Round (Maximum)57.974~57.995 mm (2.2824~2.2832 in.)
0.003 mm (0.0001 in.)
Main Bearing Clearance (All)0.015~0.040 mm (0.00059~0.00157 in.)
Crankshaft End Play0.070~0.302 mm (0.0027~0.0118 in.)
Service OversizeAvailable in 2 sizes
0.25 mm and 0.50 mm (0.0098~0.0196 in.)
Connecting Rod Journal:

1C2 – 4I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
FASTENER TIGHTENING SPECIFCATIONS
ApplicationNSmLb–FtLb–In
Air Cleaner Housing Bolts10–89
Automatic Tensioner Bolt2518–
Camshaft Bearing Bridge and Oil Pan Scraper Bolts20 + 45°15 + 45°–
Camshaft Bearing Cap Bolts8–71
Camshaft Cover Bolts8–71
Charcoal Canister Purge and Exhaust Gas Recirculation Sole-
noid Bracket Bolt5–44
Connecting Rod Bearing Cap Bolts35
+ 45° + 15°26
+ 45° + 15°–
Coolant Bypass Housing and Mounting Bolts1511–
Crankshaft Bearing Cap Bolts50
+ 45° + 15°37
+ 45° + 15°–
Crankshaft Pulley Bolts2015–
Crankshaft Gear Bolt145
+ 30° + 15°107
+ 30° + 15°–
Cylinder Head Bolts25 + 90°
+ 90° + 90°18 + 90°
+ 90° + 90°–
Direct Ignition System Coil and Exhaust Gas Recirculation
Mounting Bracket Bolts2518–
Engine Mount Bracket Retaining Bolts and Nuts5541–
Engine Mount Retaining Bolts4533–
Engine–to–Intake Manifold Support Bracket Bolts2015–
Exhaust Camshaft Gear Bolt50
+ 60° + 15°37
+ 60° + 15°–
Exhaust Flex Pipe–to–Catalytic Converter or Connecting Pipe
Retaining Nuts3526–
Exhaust Flex Pipe–to–Exhaust Manifold Retaining Nuts3526–
Exhaust Manifold Heat Shield Bolts8–71
Exhaust Manifold Retaining Nuts2216–
Flexible Plate Bolts4533–
Flywheel Bolts65
+ 30° + 15°48
+ 30° + 15°–
Front Timing Belt Cover Bolts6–53
Generator–to–Intake Manifold Strap Bracket Bolt2216–
Generator–to–Intake Manifold Support Bracket Bolts3727–
Intake Camshaft Gear Bolt50
+ 60° + 15°37
+ 60° + 15°–
Intake Manifold Retaining Bolt and Nuts2216–
Intake Manifold Support Bracket Lower Bolt2518–
Intake Manifold Support Bracket Upper Bolts2518–
Lower Block Support Bracket and Splash Shield Bolts3526–
Oil Pan Drain Plug3526–
Oil Pan Flange–to–Transaxle Bolts4030–

1.8L DOHC ENGINE MECHANICAL 1C2 – 11
DAEWOO V–121 BL4
1. Connecting Rod
2. Bearing Set
3. Connecting Rod Bolt
4. Piston Ring Set
5. Piston Pin
6. Piston
7. Engine Block
8. Sleeve
9. Water Jacket Cap
10. Bolt (Manual Transaxle)
11. Flywheel (Manual Transaxle)
12. Flexible Plate (Automatic Transaxle)
13. Bolt (Automatic Transaxle)
14. Clamp
15. Hose
16. Clamp
17. Engine Ventilation Pipe
18. Bolt
19. Gasket
20. Needle Sleeve
21. Crankshaft Rear Seal
22. Crankshaft
23. Transmitter Disk
24. Bolt
25. Oil Pan Scraper
26. Oil Pan
27. Drain Plug
28. Washer
29. Bolt
30. Sleeve
31. Gasket
32. Bolt
33. Oil Pump Cover
34. Ring Gear
35. Gear
36. Oil Pressure Switch
37. Washer
38. Washer
39. Oil Duct Outlet Plug
40. Connecting Piece
41. Seal Ring
42. Oil Filter43. Bypass Valve
44. Pressure Relief Valve Plunger
45. Pressure Relief Valve Spring
46. Seal Ring
47. Pressure Relief Valve Plug
48. Seal Ring
49. Bolt
50. Oil Suction Pipe
51. Bolt
52. Rear Timing Belt Cover
53. Bolt
54. Special Bolt
55. Idler Pulley
56. Stud
57. Nut
58. Bolt
59. Tensioner
60. Bolt
61. Thrust Inner Washer
62. Woodruff Key
63. Crankshaft Gear
64. Thrust Outer Washer
65. Bolt
66. Camshaft Drive Belt
67. Gasket
68. Front Timing Belt Cover
69. Bolt
70. Bushing Plug
71. Bushing
72. Oil Gallery Plug
73. Bolt
74. Water Pump
75. Seal Ring
76. Crankshaft Position Sensor
77. Bolt
78. Knock Sensor*
79. Bolt
80. Bolt
81. Crankshaft Bearing Bridge
* : 2.0L DOHC Engine

1.8L DOHC ENGINE MECHANICAL 1C2 – 51
DAEWOO V–121 BL4
43. Connect the lower radiator hose to the coolant pipe.
44. Connect the upper radiator hose to the thermostat
housing.
45. Connect the heater inlet hose to the cylinder head.
46. Connect the heater outlet hose to the coolant pipe.
47. Connect the coolant surge tank hose to the coolant
pipe.
48. Connect the coolant hose to the throttle body.
49. Connect the throttle cable to the throttle body and
the intake manifold bracket.
50. Install the fuel pump fuse.
51. Connect the negative battery cable.
52. Refill the engine crankcase with engine oil.
53. Refill the engine coolant system. Refer to Section
1D, Engine Cooling.
54. Bleed the power steering system. Refer to Section
6A, Power Steering.
55. Refill the A/C refrigerant system, if equipped. Refer
to Section 7B, Manual Control Heating, Ventilation,
and Air Conditioning System.
56. Install the hood. Refer to Section 9R, Body Front
End.
PISTONS AND RODS
Tools Required
J–8037 Universal Piston Ring Compressor
J–8087 Cylinder Bore Check Gauge
KM–427 Piston Pin Service Set
KM–470–B Angular Torque Gauge
Removal Procedure
1. Remove the cylinder head with the intake manifold
and exhaust manifold attached. Refer to ”Cylinder
Head and Gasket” in this section.
2. Remove the oil pan. Refer to ”Oil Pan” in this sec-
tion.
3. Remove the oil suction pipe bolts and support
bracket bolts.
4. Remove the oil suction pipe.
5. Remove the crankshaft bearing bridge and the oil
pan scraper bolts.
6. Remove the crankshaft bearing bridge and the oil
pan scraper.

1C2 – 52I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
7. Move the piston to the bottom of the piston stroke.
8. Mark the connecting rod cap for position.
9. Remove the connecting rod cap bolts.
10. Remove the connecting rod cap and the lower con-
necting rod bearing.
11. Remove the upper piston connecting rod bearing.
12. Ridge ream the cylinder wall.
CAUTION : Use care when handling the piston. Worn
piston rings are sharp and may cause injury.
13. Remove the piston.
14. Use a piston ring expander tool to expand the pis-
ton rings.
15. Remove the piston rings.
16. Remove the piston pin from the piston and connect-
ing rod assembly using the piston pin service set
KM–427.
17. Separate the piston from the connecting rod.
Inspection Procedure
1. Inspect the connecting rod for bending or twisting. If
the connecting rod is bent or twisted, replace the
connecting rod.
2. Inspect the connecting rod bearings.
3. Inspect the connecting rod lower end for wear.
4. Inspect the connecting rod upper end for scoring.
5. Inspect the crankshaft rod bearing journal for wear.
Refer to ”Engine Specifications” in this section.
6. Inspect the piston for scoring, cracks, and wear.
7. Inspect the piston for taper using a micrometer.

1.8L DOHC ENGINE MECHANICAL 1C2 – 53
DAEWOO V–121 BL4
8. Inspect the piston for fit to the connecting rod.
9. Inspect the engine block deck surface for flatness
using a straight edge and a feeler gauge. Refer to
”Engine Specifications” in this section.
10. Inspect the bearing bore for concentricity and align-
ment using cylinder bore check gauge J–8087. Re-
fer to ”Engine Specifications” in this section. If the
bearing bore is beyond specifications, replace the
engine block.
11. Inspect the engine block cylinder bore for wear,
runout, ridging and taper using a bore gauge. Refer
to ”Engine Specifications” in this section.
12. Inspect the engine block cylinder bore for glazing.
Lightly hone the cylinder bore as necessary.
Installation Procedure
Important : For ease of installation of the piston pin, the
connecting rod should be heated to 2805C. Heat the upper
connecting rod only. Use commercial thermocolor materi-
al to determine the correct temperature. When the thermo-
color material changes from black to green, the tempera-
ture is correct for installation.
1. Align the notch on the piston and connecting rod so
that the proper sides will be facing the front of the
engine.
2. Install the piston pin guide through the piston and
the connecting rod.
3. Coat the piston pin with clean oil.
4. Install the piston pin into the opposite side of the
piston.
5. Install the piston pin into the piston and connecting
rod assembly using the piston pin service set
KM–427.
6. Select a set of new piston rings.
7. Measure the piston ring gap using a feeler gauge.
Refer to ”Engine Specifications” in this section.
8. Increase the piston ring gap by carefully filing off
excess material if the piston ring gap is below spec-
ifications.

1C2 – 54I1.8L DOHC ENGINE MECHANICAL
DAEWOO V–121 BL4
9. Measure the piston ring side clearance using a feel-
er gauge. Refer to ”Engine Specifications’’ in this
section.
10. If the piston ring is too thick, try another piston ring.
11. If no piston ring can be found that fits to specifica-
tions, the piston ring may be ground to size with
emery paper placed on a sheet of glass.
12. Install a piston oil ring, the expander, then the sec-
ond piston oil ring to the bottom ring groove of the
piston.
13. Install the second compression ring to the middle
ring groove of the piston.
14. Install the top compression ring to the top ring
groove of the piston.
15. Use a piston ring expander to install the piston
rings. Do not expand the piston rings beyond the
expansion necessary for installation.
16. Stagger the piston oil rings, the oil ring rail gaps,
the second compression ring, and the top compres-
sion ring in relation to the notch on the top of the
piston.
17. Lubricate the cylinder wall and the piston rings with
clean engine oil.
18. Install the piston using the universal piston ring
compressor J–8037 and a wood handle. Guide the
lower connecting rod end to prevent damaging the
crankshaft journal.
19. Install the connecting rod cap and bearings. Refer
to ”Crankshaft Bearings and Connecting Rod Bear-
ings – Gauging Plastic” in this section.

1.8L DOHC ENGINE MECHANICAL 1C2 – 55
DAEWOO V–121 BL4
20. Install the connecting rod 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 bolts one turn of 45 degrees
plus one turn of 15 degrees.
21. Install the crankshaft bearing bridge/oil pan scraper
bolts.
Tighten
Tighten the crankshaft bearing bridge/oil pan scraper
bolts to 20 NSm (15 lb–ft) plus 45 degrees using the
angular torque gauge KM–470–B.
22. Install the oil suction pipe.
23. Install the oil suction pipe bolts.
Tighten
Tighten the oil suction pipe bolts to 8 NSm (71 lb–in)
and the oil suction pipe bracket bolt to 6 NSm (53 lb–
in).
24. Install the oil pan. Refer to ”Oil Pan” in this section.
25. Install the cylinder head with the intake manifold
and exhaust manifold attached. Refer to ”Cylinder
Head and Gasket” in this section.