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1.5 TORQUE SPECIFICATIONS
Screws, bolts and nuts must be tightened to the specified torque using a torque wrench. Several screws, bolts and
nuts such as those used on the cylinder head must be tightened in the proper sequence and at the proper torque.
1.5.1 Torque Specifications For Special Use Screws, Bolts and Nuts
In r emoving and applying the screws, bolts and nuts marked with “*”, a pneumatic wr ench or similar tool, if employed,
must be used with care. Failure to do so may result in stripped or seized screws, bolts and nuts.
When replacing “*” marked screws, bolt and nuts, apply engine oil to their threads and seats before reassembly.
The letter “M” in size and pitch m eans that the screw, bolt or nut dimension is metric. The s ize is the nominal outside
diameter in mm of the threads. The pitch is the nominal distance in mm between two threads.
Item
SizexPitch N.m kgf.m ft--lb s
Cylinder Head Cover Bolt M6 x 1.0 6.87 to 11.2 0.7to1.15 5.07 to 8.31
*Cylinder Head Bolt M11 x 1.25 93.2 to 98.0 9.5 to 10.0 68.8 to 72.3
*Main Bearing Case Bolt 1 M9 x 1.25 46 to 50 4.7to5.2 34.0to37
*Main Bearing Case Bolt 2 M10 x 1.25 69 to 73 7.0to7.5 51 to 54
*Flywheel Bolt M12 x 1.25 98.1 to 107 10.0 to 11.0 72.4 to 79.5
*Connecting Rod Bolt M8 x 1.0 45 to 49 4.5to5.0 33 to 36
*Rocker Arm Bracket Bolt M8 x 1.25 24 to 27 2.4to2.8 18 to 20
*Idle Gear Shaft Bolt M8 x 1.25 24 to 27 2.4to2.8 18 to 20
Crank Pulley Mounting Nut M30 x 1.5 138 to 156 14.0 to 16.0 102 to 115
*Bearing Case Cover Bolt M8 x 1.25 24 to 27 2.4to2.8 18 to 20
Nozzle Holder Clamp Bolt M10 x 1.25 26 to 29 2.6to3.0 19 to 21
Injection Pipe Retaining Nut M12 x 1.5 15 to 24 1.5to2.5 11 to 18
Overflow Pipe Assembly Retaining Bolt M6 x 1.0 9.81 to 11.2 1.0to1.15 7.24 to 8.31
Camshaft Retaining Bolt M8 x 1.25 24 to 27 2.4to2.8 18 to 20
Hi--idling Body M14 x 1.0 45 to 49 4.5to5.0 33 to 36
Starter’s Terminal B Mounting Nut M8 9.8to11 1.0to1.2 7.3to8.6
1.5.2 Torque Specifications For General Use Screws, Bolts and Nuts
Standard Screw and Bolt
Grade 4
Special Screw and Bolt
Grade 7
N.m kgf.m ft--lb s N.m kgf.m ft--lbs
M6 7.9to9.3 0.80 to 0.95 5.8to6.8 9.81 to 11.2 1. 00 to 1.15 7.24 to 8.31
M8 18 to 20 1.8to2.1 13 to 15 24 to 27 2.4to2.8 18 to 20
M10 40 to 45 4.0to4.6 29 to 33 49 to 55 5.0to5.7 37 to 41
M12 63 to 72 6.4to7.4 47 to 53 78 to 90 7.9to9.2 58 to 66
Screw and bolt material g rades ar e shown by numbers punched on the screw and bolt heads. Prior to tightening, be
sure to check out the numbers as shown below
Punched Number
Screw And Bolt Material Grade
None or 4 Standard Screw And Bolt SS41, S20C
7 Special Screw And Bolt S43C, S48C (Refined)