Daewoo GC25E-3 Service Manual

G424 Service Manual General Information11
General Bolts and Nuts Tightening Torque
Standard Bolts and Nuts
Nominal
Torque, kg•m (lb•ft) [N•m]
Pitch Bolt, stud, nut (with spring washer) Flange bolt, flange nut
diameter
M5 M5
M6 M6
M7 M7
M8 M8
M9 M9
M10 M10
Tapered Threads
Torque, kg•m (lb•ft) [N•m]
Size Material of internal threads: Material of internal threads:
Aluminum alloy Cast iron or steel
NPTF 1/16 0.5 to 0.8 (3.6 to 5.8) [5 to 8] 0.8 to 1.2 (5.8 to 8.7) [8 to 11]
PT 1/8 0.8 to 1.2 (5.8 to 8.7) [8 to 11] 1.5 to 2.2 (10.8 to 15.9) [15 to 21]
PT 1/4 2.0 to 3.0 (14.5 to 21.7) [20 to 29] 3.5 to 4.5 (25.3 to 32.5) [34 to 44]
NPTF 1/4 2.0 to 3.0 (14.5 to 21.7) [20 to 29] 3.5 to 4.5 (25.3 to 32.5) [34 to 44]
PT 3/8 4.0 to 5.5 (28.9 to 39.8) [39 to 59] 5.5 to 7.5 (39.8 to 54.2) [54 to 73]
PT 1/2 7.0 to 10.0 (50.6 to 72.3) [69 to 98] 12.0 to 16.0 (86.8 to 115.7) [118 to 156]
Head mark 4
-
-
1.2 (8.7) [12]
2.5 (18.1) [25]
4.2 (30.4) [41]
7.3 (52.8) [72]
Head mark 7
0.5 (0.5) [3.6]
0.9 (6.5) [8.8]
2.2 (15.9) [22]
4.5 (32.5) [44]
8.6 (60.0) [81]
14.0 (101.3) [137]
Head mark 10
-
1.2 (8.7) [12]
3.0 (21.7) [29]
6.0 (43.4) [59]
10.7 (77.4) [105]
14.5 (104.9) [142]
Head mark 4
-
-
1.3 (9.4) [13]
2.6 (18.8) [25]
4.7 (34.0) [46]
-
Head mark 7
0.6 (4.3) [5.9]
1.0 (7.2) [9.8]
2.4 (17.4) [24]
5.0 (36.2) [49]
9.5 (68.7) [93]
-
New Tightening Method-By Use of Bolts to be Tightened in Plastic Area
A new type of bolts, to be tightened in plastic area, is currently used in some parts of the engine. The tightening
method for the bolts is different from the conventional one. Be sure to observe the method described in the text
when tightening the bolts.
Service limits are provided for the bolts. Make sure that the service limits described in the text are strictly
observed.
•
Area where the bolts are in use:
(1) Cylinder head bolts
(2) Main bearing cap bolts
(3) Connecting rod cap bolts
•
Tightening method
After tightening the bolts to the specified torque, tighten them another 90° or 180° (twice 90°). The tightening
method varies on different areas. Observe the tightening method described in the text.

Daewoo GC25E-3 Specifications

General

Brand	Daewoo
Model	GC25E-3
Category	Engine
Language	English