117
Universal torque table of metric thread
Specifications
Tightening torque (N.M)
8.8 class
10.9 class
M6
9~12
13~16
M8
22~30
30~36
M10
45~59
65~78
M12
78~104
110~130
M14
124~165
180~210
M16
193~257
280~330
M18
264~354
380~450
M20
376~502
540~650
M22
512~683
740~880
M24
651~868
940~1120
M27
952~1269
1400~1650
M30
1293~1723
1700~2000
M33
1759~2345
2743~3298
M36
2259~3012
2800~3350
M39
2932~3898
4111~5481
Torque table of the thread inserts smeared with sealants
Pipe Thread Size Code
Tightening torque (N.M)
3/8
15±2
3/4
24±4
1/2
23±3
1
45±4
5.7MAINTENANCE OF THE ENGINE COOLANT
The engine cooling system has great influence on the performance, reliability and
durability of the overall engine. Therefore to properly maintain the engine cooling system
is extremely important, the engine overheat and over-cold, piston and piston ring and
cylinder liner are locked deadly, thermal fatigue crack occurs on the cylinder head,
lubricants quickly degenerate, spot eroded, air eroded and others faults are common
failures in the cooling system, they will not only cause the overall deterioration of power,
economical efficiency, reliability and durability of the engine, but also cause serious
damage to the engine.