Jeep Grand Cherokee WK. Manual — part 2
FASTENER IDENTIFICATION
DESCRIPTION
The SAE bolt strength grades range from grade 2 to grade 8. The higher the grade number, the greater the bolt
strength. Identification is determined by the line marks on the top of each bolt head. The actual bolt strength grade
corresponds to the number of line marks plus 2. The most commonly used metric bolt strength classes are 9.8 and
10.9. The metric strength class identification number is imprinted on the head of the bolt. The higher the class
number, the greater the bolt strength. Some metric nuts are imprinted with a single-digit strength class on the nut
face. Refer to the Fastener Identification and Fastener Strength Charts.
Bolt Markings and Torques - Metric
Bolt Markings
8.8/8.9
10.9
12.9
Bolt Dia.
N·m
Ft. Lbs.
N·m
Ft. Lbs.
N·m
Ft. Lbs.
6
12
105*
14
120*
16
12
8
25
250*
32
23
38
28
10
54
40
60
45
74
55
12
95
70
108
80
135
100
14
155
115
175
130
216
160
16
243
180
324
210
324
240
* Inch Lbs.
Bolt Markings and Torques - U. S. Customary
Bolt Markings
Grade 5
Grade 8
Bolt Dia.
N·m
Ft. Lbs
N·m
Ft. Lbs
1/4 - 20
10
95*
14
125*
1/4 - 28
10
95*
17
150*
5/16 - 18
22
200*
30
270*
5/16 - 24
26
240*
33
300*
3/8 - 16
40
30
55
40
3/8 - 24
47
35
60
45
7/16 - 14
68
50
88
65
7/16 - 20
74
55
95
70
1/2 - 13
101
75
135
100
1/2 -20
115
85
150
110
9/16 - 12
135
105
182
135
9/16 - 18
155
115
202
150
5/8 - 11
202
150
263
195
5/8 - 18
215
160
284
210
3/4 - 10
230
170
297
220
3/4 - 16
236
175
304
225
7/8 - 14
405
300
540
400
* Inch Lbs.
4
INTRODUCTION
WK
WK
INTRODUCTION
5
FASTENER USAGE
DESCRIPTION
FASTENER USAGE
WARNING: Use of an incorrect fastener may result in component damage or personal injury.
Fasteners and torque specifications references in this Service Manual are identified in metric and SAE format.
During any maintenance or repair procedures, it is important to salvage all fasteners (nuts, bolts, etc.) for reassem-
bly. If the fastener is not salvageable, a fastener of equivalent specification must be used.
THREADED HOLE REPAIR
DESCRIPTION
THREADED HOLE REPAIR
Most stripped threaded holes can be repaired using a Helicoil
T
. Follow the vehicle or Helicoil
T
recommendations for
application and repair procedures.
INTERNATIONAL SYMBOLS
DESCRIPTION - INTERNATIONAL SYMBOLS
The graphic symbols illustrated in the following International Control and Display Symbols Chart are used to identify
various instrument controls. The symbols correspond to the controls and displays that are located on the instrument
panel.
6
INTRODUCTION
WK
METRIC SYSTEM
DESCRIPTION
The metric system is based on quantities of one, ten, one hundred, one thousand and one million.
The following chart will assist in converting metric units to equivalent English and SAE units, or vise versa.
CONVERSION FORMULAS AND EQUIVALENT VALUES
MULTIPLY
BY
TO GET
MULTIPLY
BY
TO GET
in-lbs
x
0.11298
= Newton Meters
(N·m)
N·m
x 8.851
= in-lbs
ft-lbs
x
1.3558
= Newton Meters
(N·m)
N·m
x
0.7376
= ft-lbs
Inches Hg (60° F)
x 3.377
= Kilopascals (kPa)
kPa
x
0.2961
= Inches Hg
psi
x 6.895
= Kilopascals (kPa)
kPa
x 0.145
= psi
Inches
x 25.4
= Millimeters (mm)
mm
x
0.03937
= Inches
Feet
x
0.3048
= Meters (M)
M
x 3.281
= Feet
Yards
x
0.9144
= Meters
M
x
1.0936
= Yards
mph
x
1.6093
= Kilometers/Hr.
(Km/h)
Km/h
x
0.6214
= mph
Feet/Sec
x
0.3048
= Meters/Sec (M/S)
M/S
x 3.281
= Feet/Sec
mph
x
0.4470
= Meters/Sec (M/S)
M/S
x 2.237
= mph
Kilometers/Hr. (Km/h)
x
0.27778
= Meters/Sec (M/S)
M/S
x 3.600
Kilometers/Hr. (Km/h)
COMMON METRIC EQUIVALENTS
1 inch = 25 Millimeters
1 Cubic Inch = 16 Cubic Centimeters
1 Foot = 0.3 Meter
1 Cubic Foot = 0.03 Cubic Meter
1 Yard = 0.9 Meter
1 Cubic Yard = 0.8 Cubic Meter
1 Mile = 1.6 Kilometers
Refer to the Metric Conversion Chart to convert torque values listed in metric Newton- meters (N·m). Also, use the
chart to convert between millimeters (mm) and inches (in.).
WK
INTRODUCTION
7
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст