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STANDARD HARDWARE
BOLT HEAD MARKINGS
Bolt strength classes are embossed on the head of each bolt.
Customary (inch) bolts are identifed' by markings two to grade eight
(strongest), The marks correspond to two marks less than the actual grade,
Le,; a grade seven bolt will display five embossed marks.
Metric bolt class numbers identify bolts by their strength with 10.9 the
strongest.
NOTES:
1.
Use the torque values listed below when specific torque values are not available.
2. These torques are based on clean, dry threads. Reduce torque by 10% when engine oil istJsed.
3. Reduce torques by 30% or more, when threading capscrews into aluminum.
STANDARD BOLT & NUT TORQUE SPECIFICATIONS
METRIC BOLT
&
NUT TORQUE SPECIFICATIONS
SAE Grade 5
SAE Grade 6·7
SAE Grade 8
Capsrew Body Size
Torque
Torque
Torque
Boll
Grade 4.6
Grade 4.8
Grade 8.8 • 9.8 Grade 10.9
(Inches) • (Thread)
A·Lb(Nm) .
FHb(Nm)
FHb(Nm)
Dia.
Wrench Size
A'Lb(Nm)
FHb(Nm)
FI·Lb(Nm)
FI·Lb (Nm)
1/4· 20
8 (11)
10 (14)
12 (16)
·28
10 (14)
14 (19)
M3
5.5mm
0.3 (0.5)
0.5 (0.7)
1 (1.3)
1.5 (2)
5/16-18
17 (23)
19 (26)
24 (33)
- 24
19 (26)
27 (37)
M4
7mm
0.8 (1.1)
1 (1.5)
2 (3)
3 (4.5)
M5
8mm
1.5 (2.5
2 (3)
4.5 (6)
6.5 (9)
318-16
31 (42)
34 (46)
44 (60)
- 24
35 (47)
49 (66)
M8
10mm
3 (4)
4 (5.5)
7.5 (10)
11 (15)
M9
13mm
7 (9.5)
10 (13)
18 (25)
35 (26)
7/16-14
49 (66)
55 (75)
70 (95)
Ml0
16mm
14 (19)
18 (25)
37 (50)
55 (75)
- 20
55 (75)
78 (106)
1/2 -13
75 (102)
85 (115)
105 (142)
- 20
85 (115)
120 (163)
M12
18mm
26 (35)
33 (45)
63 (85)
97 (130)
M14
21 mm
37 (50)
55 (75)
103 (140)
151 (205)
M16
24mm
59 (80)
85 (115)
159 (215)
232 (315)
9/16 -12
110 (149)
120 (163)
155 (210)
-18
120 (163)
170 (231)
M18
27mm
81 (110)
118 (160)
225 (305)
321 (435)
5/8-11
150 (203)
167 (226)
210 (285)
M20
30mm
118 (160)
166 (225)
321 (435)
457 (620)
-18
170 (231)
240 (325)
M22
33mm
159 (215)
225 (305)
435 (590)
620 (840)
314 -10
270 (366)
280 (380)
375 (508)
-16
295 (400)
420 (569)
M24
36mm
203 (275)
288 (390)
553 (750)
789 (1070)
7/8 - 9
395 (536)
440 (597)
605 (820)
-14
435 (590)
675 (915)
M27
41 mm
295 (400)
417 (565)
811 (1100)
1154 (1565)
M30
46mm
402 (545)
568 (770)
1103 (1495)
1571 (2130)
1 - 8
590 (800)
660 (895)
910 (1234)
-14
660 (895)
990 (1342)
M33
51 mm
546 (740)
774 (1050)
1500 (2035)
2139 (2900)
M36
55mm
700 (950)
992 (1345)
1925 (2610)
2744 (3720)
NOTE: Formula to convert Ft-Lbs to Nm (Newton Meters) multiply Ft-Lbs
by
1.356.
SEALANTS & LUBRICANTS
GASKETSISEALANTS
Oil based PERMATEX #2 and it's HIGH TACK equivalent are excellent all
purpose sealers. They are effective in just about any joint in contact with
coolant, raw water, oil or fuel.
A light coating of OIL or LIQUID TEFLON can be used on rubber gaskets
and O-rings.
LOCTITE hydraulic red sealant should be used on oil adapter hoses and the oil
filter assembly.
Coat both surfaces of the oil pan gasket with high temp RED SILICONE sealer.
When installing gaskets that seal around water (coolant) passages, coat both
sides with WHITE SILICONE grease.
High-copper ADHESIVE SPRAYS are useful for holding gaskets in position dur-
ing assembly.
Specialized gasket sealers such as HYLOMAR work well in applications requir-
ing non-hardening properties. HYLOMAR is particlarly effective on
copper cylinder-head gaskets as it resists fuel, oil and water.
Use LIQUID TEFLON for sealing pipe plugs and fillings that connect coolant
passages. Do not use
tape
sealants!
BOLTS & FASTENERS/ASSEMBLIES
Lightly oil head bolts and other fasteners as you assemble them. Bolts and
plugs that penetrate the water jacket should be sealed with PERMATEX #2 or
HIGH TACK.
When assembling the flywheel, coat the bolt threads with LOCTITE blue.
Anti-seize compounds and thread locking adhesives such as LOCTITE protect
threaded components yet allows them to came apart when necessary.
LOCTITE offers levels of locking according to the job.
LITHIUM based grease is waterproof, ideal for water pump bearings and stuff-
ing boxes.
Heavily oil all sliding and reciprocating components when assembling. Always
use clean engine oil!
Engines. & Generators
54
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