Tightening torque of Kubota engines.

Kubota tightening torques

 

• An important rule is that the head bolts must first be oiled, on which the correct NM can then be measured with the torque wrench.

Tuning of all 05 engines:

• D905, D1005, D1105
• V1205, V1305, V1505

Valve clearance when engine is cold:

• 0.145 to 0.185mm
• 0.00571 to 0.00728 inch

Head bolts:

• 63.7nm to 68.6nm
• 6.5 to 7KGF
• 47.0 to 50.6 FT-LBS

Main Bearing bolt

• Bolt 1 29.4nm to 34.3
• Bolt 2 49.0 to 53.9nm

Glow plug:

• 7.8 to 14.7 nm
• 0.8 to 1.5KGf
• 5.8 to 10.8 FT-LBS

Tuning of all 03 engines

• D1503, D1703, D1803
• V2003, V2203, V2403

Valve clearance when engine is cold:

• 0.18 to 0.22mm
• 0.0071 to 0.0087 inch

Head bolts:

• 93.1nm to 98nm
• 9.5 to 10.0KGF
• 68.7 to 72.3 FT-LBS

Main Bearing bolt

• Bolt 1 46.1 to 50.9
• Bolt 2 68.6 to 73.5nm

Glow plug:

• 19.6 to 24.5 nm
• 2.0 to 2.5KGf
• 14.5 to 18.1 FT-LBS

Tuning of all 02 engines

• Z402, Z482
• D622, D722, D782

Valve clearance when engine is cold:

• 0.145 to 0.185mm
• 0.00571 to 0.00728 inch

Head bolts:

• 37.3nm to 42.2nm
• 3.8 to 4.3KGF
• 27.5 to 31.1 FT-LBS

Main Bearing bolt

• Bolt 1 12.7 to 15.7nm
• Bolt 2 26.5 to 30.4nm

Glow plug:

• 7.85 to 14.7 nm
• 0.8 to 1.5KGf
• 5.8 to 10.8 FT-LBS

 

General rule for bolts by size