Page 9 - Catalog auto parts FEBI for trucks MAN

Auto Parts / Cylinder Head Screws

cylinder head screws should be replaced when the cylinder head is lifted, as 2 mm of "Stretch"
is the maximum allowable. When replacing a cylinder head screw of the old execution with the
new execution, this must only be fitted in complete set.

Replaces No. febi No. original Length max. allowable Length

51.90490.0024 11726 109 mm 111 mm Torx - Execution

51.90490.0023 11725 144 mm 146 mm Torx - Execution

51.90490.0022 11724 168 mm 170 mm Torx - Execution

51.90020.0381 05229 140 mm 142 mm Torx - Execution

The Tightening Torque and Angle is as follows:

1st Stage: 10 Nm
2nd Stage: 80 Nm
3rd Stage: 150 Nm
4th Stage: 90°
5th Stage: 90°

1st Re - Tightening: 90°

Re - tighten all 6 Cylinder Head Screws after approx, one hour running time but not later
than 650 miles (1000 kms) vehicle travel.

* IMPORTANT*
Making sure the engine is cold and do not loosen screws before re - tightening.

2nd Re - Tightening: 90°

Re - tighten only the 4 corner Cylinder Head Screws after 12500 mls (20000 km) up to
19000 mls (30000 km) Vehicle Travel.

* IMPORTANT*
Making sure the engine is cold and do not loosen screws before re - tightening.

MAN 2011-2012.indb 8 09.08.2010 09:10:40 / Auto Parts

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