Tightening torques for fasteners of diesel engine KAMAZ 740.11-240, 740.13-260, 740.14-300, 740.30-260, 740.50-360, 740.51-320

The table presents the tightening conditions for various bolts and nuts in the engine and other vehicle systems.

To ensure the reliability and durability of the joints, it is important to observe the specified tightening parameters.

The main points are given below:

  1. Crankshaft main bearing cap fastening bolts:
    Thread: lubricate with engine oil, remove excess oil.
    Tightening:
    • preliminary: 95–120 N·m (9.6–12 kgf·m);
    • final: 275–295 N·m (28–30 kgf·m).
    Tightening order: from the middle support to the outer ones, starting from the right-hand row.
  2. Crankshaft bearing cap draw bolts:
    Thread: lubricate with engine oil, remove excess oil.
    Tightening: 147–167 N·m (15–17 kgf·m).
  3. Flywheel fastening bolts:
    Thread: lubricate with a thin layer of graphite grease.
    Tightening:
    • 7406.1005127: 245–264 N·m (25–27 kgf·m);
    • 740.1005127-11: 167–186 N·m (17–19 kgf·m).
  4. Power take-off half-coupling and damper fastening bolts:
    Thread: apply «Stopor-6» or «Unigerm 6» sealant.
    Tightening: 98–117.6 N·m (10–12 kgf·m).
  5. Connecting rod cap fastening bolt:
    Tightening:
    • preliminary: 76.5–80.4 N·m (7.8–8.2 kgf·m);
    • final: nut rotation angle 50° ± 5° and torque 108–180 N·m (11–18.3 kgf·m);
    • permitted: 127.5–137.3 N·m (13–14 kgf·m).
  6. Cylinder block front cover fastening bolts:
    • M10×1.25: 49–60.8 N·m (5–6.2 kgf·m);
    • M12×1.25: 88.1–108 N·m (9–11 kgf·m).
  7. Cylinder head fastening bolts (M16):
    Thread: lubricate with a thin layer of graphite grease.
    Tightening:
    • 1st stage: 39–49 N·m (4–5 kgf·m);
    • 2nd stage: 98–127 N·m (10–13 kgf·m);
    • 3rd stage: 186–206 N·m (19–21 kgf·m).
  8. Cylinder head cover bolts (M8):
    Tightening: 12.7–17.6 N·m (1.3–1.8 kgf·m).
  9. Flywheel housing fastening bolts:
    • M12:
      • 1st stage: 50–70 N·m (5–7 kgf·m);
      • 2nd stage: 88–108 N·m (9–11 kgf·m).
    • M10:
      • 1st stage: 20–30 N·m (2–3 kgf·m);
      • 2nd stage: 43.1–54.9 N·m (4.4–5.6 kgf·m).
  10. Camshaft drive driving gear axle fastening bolts (M10):
    Tightening: 49–61 N·m (5–6.2 kgf·m).
  11. Exhaust manifold fastening bolts (M10):
    Tightening: 43–55 N·m (4.4–5.6 kgf·m).
  12. Compressor housing fastening bolts (M6):
    Tightening: 4.9–7.8 N·m (0.5–0.8 kgf·m).
  13. Turbine housing fastening bolts (M8):
    Tightening: 23.5–29.4 N·m (2.4–3 kgf·m).
  14. Oil supply pipe to turbocharger fastening bolts (M14):
    Tightening: 49–68 N·m (5–7 kgf·m).
  15. Low-pressure fuel pipe fastening bolts:
    • M14: 39.2–49 N·m (4–5 kgf·m);
    • M12: 34.3–49 N·m (3.5–5 kgf·m);
    • M10: 19.6–24.5 N·m (2–2.5 kgf·m).
  16. Oil pump fastening bolts (M10):
    Tightening: 49–60.8 N·m (5–6.2 kgf·m).
  17. Rocker support fastening nuts (M10):
    Tightening: 41–53 N·m (4.2–5.4 kgf·m).
  18. Injector clamp fastening nuts (M10):
    Tightening: 31–39 N·m (3.2–4.0 kgf·m).
  19. Turbocharger fastening nuts (M10):
    Tightening: 44–56 N·m (4.4–5.6 kgf·m).
  20. High-pressure fuel pipe nuts:
    Tightening: 24.5–44.1 N·m (2.5–4.5 kgf·m).
  21. Rocker adjusting screw nuts (M10):
    Tightening: 33–41 N·m (3.4–4.2 kgf·m).
  22. Oil filter cap plugs:
    Tightening: 10.78–24.5 N·m (1.1–2.5 kgf·m).
  23. Oil filter cap nuts:
    Tightening: 49–58.8 N·m (5–6 kgf·m).
  24. Oil sump drain plug:
    Tightening: 40–58.8 N·m (4–6 kgf·m).

General recommendations:

  • Before tightening, make sure the thread is clean and lubricated (if required).
  • Use a torque wrench to observe the tightening torques precisely.
  • Observe the tightening sequence, especially for critical joints (e.g. cylinder heads, crankshaft bearing caps).