Tightening torques group 20
M6 standard bolt 8.8..... 10±1,5 Nm
M8 standard bolt 8.8..... 24±4 Nm
M10 standard bolt 8.8..... 48±8 NM
M12 standard bolt 8.8..... 85±15 Nm
M14 standard bolt 8.8..... 140±25 Nm
M16 standard bolt 8.8..... 190±35 Nm
Torque and angle tightened/yield limit tightened bolts
8.8..... should not be refitted
10.9..... can be refitted
12.9..... can be refitted
Front engine mounting, cylinder block..... 275±45 Nm
Front engine mounting, front mounting pad
normal and hard road surface..... 140±25 Nm
very hard road surface..... 160±25 Nm
Front engine pad, cross member..... 80±15 Nm
Rear engine mounting, flywheel housing..... 275±40 Nm
Rear engine mounting, rear engine pad:
stage 1..... 190±10 Nm
stage 2..... 255±37 Nm
Note: Cross-tighten the bolts.
Rear engine pad, frame..... 140±25 Nm
Main bearing cap
stage 1..... 300±20 Nm
stage 2..... 120±5° Angle of tightening
Connecting rod cap
stage 1..... 20±3 Nm
stage 2..... 60±5 Nm
stage 3..... 90°±5° Angle of tightening
Reinforcement frame Note:
Tighten the bolts in the order shown in the illustration
step 1..... 65±5 Nm step 2..... 90°±5° Angle of tightening
Flywheel Note: Make sure the flange is dry and clean Note: Tighten the bolts in the order shown in the illustration.
step 1..... 60±5 Nm step 2..... 120±10° Angle of tightenin
Flywheel casing
step 1: Tighten all M14 bolts..... 160±20 Nm
step 2: Tighten all M10 bolts..... 48±8 Nm
step 3: Tighten all M8 bolts..... 24±4 Nm
Note: Apply silicone as shown in the illustration.
Vibration damper..... 90±10Nm
Note: Tighten the bolts in the order shown in the illustration.
The vibration damper's 8.8 bolts may not be reused.
Timing gear plate Bolts 1-27..... 28±4 Nm Bolt 28..... 60±8 Nm
Note: Apply silicone and tighten the bolts in the order shown in the illustration.
Timing gear cover, upper..... 24±4 Nm
Apply silicon and tighten the bolts as shown in the illustration
Cover, crankshaft seal
Step 1: Tighten all bolts by hand.
Step 2: Tighten bolts 2 and 7..... 24±4 Nm
Step 3: Tighten the remaining bolts..... 24±4 Nm
Note: Apply silicone as shown in the illustration.
Valve cover..... 25±3 Nm
Note: Tighten the bolts in the order shown in the illustration.
Oil cooler, cover..... 24±4 Nm
C ylinder head Note: The cylinder head must be fitted according to instructions, see 21124-1 Cylinder head installation group 21
stage 1..... 100 +10/–0 Nm
stage 2..... 90°±5° Angle of tightening
stage 3..... 90°±5° Angle of tightening | Lock nut, valve adjustment screw (inlet)..... 60°±5° Angle of tightening1 |
| Lock nut, valve adjustment screw (exhaust, EPG)..... 60°±5°Angle of tightening1 |
| Lock nut, valve adjustment screw (exhaust, VEB)..... 45° +0/–10° Angle of tightening1 |
Note: Tighten bolts in steps to ensure that the rocker arm shaft is screwed home without bending.
Step 1
Tighten bolts 1-7..... 15±3 Nm
Step 2
Angle tighten bolts 1-7..... 90°±5°Angle of tightening
Step 3
Tighten bolts 8-14. Begin with bolt 11..... 100±10 Nm
Step 4
Tighten bolts 15-21..... 50±5 Nm
Step 5
Angle tighten bolts 15-21..... 120°±5° Angle of tightening
step 6
Loosen bolts 8-14..... -
Step 7
Tighten bolts 8-14..... 50±5 Nm
Step 8
Angle tighten bolts 8-14..... 120°±5° Angle of tightening
1. Drive gear, crankshaft..... see flywheel
2. Idler gear, outer bull gear Tighten in the order shown in the illustration.
step 1..... 45±5 Nm
step 2..... 90°±5° Nm
3. Idler gear, adjustable Tighten the bolts in the order shown in the illustration.
step 1..... 35±4Nm
step 2..... 120°±5° Angle of tightening
4. Drive gear, camshaft Tighten the bolts in the order shown in the illustration.
step 1..... 45±5 Nm
step 2..... 90°±5 Angle of tightening
5. Drive gear, steering servo and fuel feed pump ..... 100±10 Nm
6, Drive gear, air compressor..... 200 +50/–0 Nm
Note: Tighten the bolts in the order shown in the illustration
Oil sump..... 24±4 Nm
Oil pump step 1..... 35±3 Nm step 2..... 90°±5° Angle of tightening
Oil pressure pipe Step 1:..... Tighten to zero play. Step 2: pipe diam. ∅12 mm..... 80±10 pipe diam. ∅22 mm..... 170±10 pipe diam. ∅18 mm..... 110±10 pipe diam. ∅28 mm..... 200±10 pipe diam. ∅20 mm..... 130±10
Oil cooler, retaining bolts..... 27±4 Nm
First tightening stage 1..... 20±5 Nm
stage 2..... 180°±5° Angle of tightening Loosen the retaining yoke screw before the second tightening.
Second tightening stage 1..... 20±5 Nm
stage 2..... 60°±5°
Angle of tightening Fixing yoke, unit injector (re-use of copper sleeve)
stage 1..... 20±5 Nm
stage 2..... 60°±5° Angle of tightening
Nut, electrical connector, unit injectors..... 1,5±0,5 Nm
Fuel pump-steering servo pump..... 25±2 Nm
Inlet pipe..... 24±4 Nm Note: Apply silicone as shown in the illustration
Plug, M10..... 20±3 Nm
Pressure/temperature sensor, boost air..... 12±2 Nm
Exhaust manifold:
Step 1 Tighten bolts 1 to contact (max 10 Nm)
Step 2 Tighten bolts 2 to contact (max 10 Nm)
Step 3 Tighten bolts 3 ..... 52±4 Nm
Tighten bolts 2 ..... 52±4 Nm
Step 3 Tighten bolts 4 ..... 52±4 Nm
Step 3 Tighten bolts 1 ..... 52±4 Nm
Step 3 Control valve (VEB)..... 20±3 Nm
