Cylinder head screw 9/16-12 x130 UNC

4 + 6 cylinder engines
A new reinforced cylinder head gasket (laminated steel) was installed. Identification feature: small hollow rivets.
For the conversion to the reinforced version, new cylinder head bolts and a new tightening procedure controlled by the angle of rotation are required.
The new gasket, the new cylinder head bolts and the new tightening procedure were introduced in production from engine serial number 846528.

Affected spare parts:
1x 87801753 cylinder head gasket TM140 TM155 TM175 TM190
1x 87801752 Cylinder head gasket TM120 TM 130
19x 87802206 Cylinder head screw short 9/16"-12x130
7x 87802207 Cylinder head screw long 9/16"-12x203.5

Tightening procedure with new bolts.
1 Tighten all bolts in the prescribed sequence (spirally from inside to outside) with a tightening torque of 55 Nm.
2 Same procedure as above but this time with 95 Nm.
3 Retighten all bolts by 90° using an angle measuring disc.
4 This only applies to the long bolts on the rocker arm brackets. Retighten these screws by a further 45°. Again, tighten in a spiral from the inside to the outside.