Tightening instructions for cylinder head bolts - AR01.30-P-5800-07B
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2012 Mercedes-Benz GL550, 2012 Mercedes-Benz GL450, 2011 Mercedes-Benz ML63, 2011 Mercedes-Benz ML550, and 2011 Mercedes-Benz ML350. However, it is still accessible from the selected car via links, so may be relevant.
Cylinder head
| Number |
Designation |
Engines 112.910/911/ 912/913/914/ 915/916/917/ 920/921/922/ 923/940/941/ 942/943/944/ 945/946/947/ 949/951/953/ 954/955/960/ 961/970/972/ 973/975/976 |
Engines 113.940/941/ 942/943/944/ 948/960/961/ 962/963/965/ 966/967/968/ 969/971/980/ 981/982/984/ 986 |
Engine 113.987/ 988 |
Engine 113.987/ 991/992/ 993/995 |
| BA01.30-P-1001-01D |
Bolt, cylinder head to crankcase |
Stage 1 |
Nm |
10 |
10 |
10 |
10 |
| Stage 2 |
Nm |
30 |
30 |
30 |
30 |
| Stage 3 |
∠ ° |
90 |
90 |
90 |
90 |
| Stage 4 |
∠ ° |
90 |
90 |
90 |
90 |
Cylinder head
| Number |
Designation |
Engine 113.989 |
Engine 113.964 |
| BA01.30-P-1001-01D |
Bolt, cylinder head to crankcase |
Stage 1 |
Nm |
10 |
10 |
| Stage 2 |
Nm |
30 |
30 |
| Stage 3 |
∠ ° |
90 |
90 |
| Stage 4 |
∠ ° |
90 |
90 |
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Tightening pattern/bolt assignment
Left and right cylinder head M 112
1-8 Collar bolt M11
- a Combination bolts M850(to timing case cover)
- b Combination bolts M830(to timing case cover)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Tightening instructions for left and right cylinder heads M 112
Use 
wrench bit to tighten cylinder head bolts.
Observe sequence, see tightening pattern.
If the tightening torque is exceeded on a cylinder head bolt, unscrew the cylinder head bolt, inspect shank length of the cylinder head bolt in question (replace bolt if necessary) and tighten again fully, beginning with stage 1.
Cylinder head bolts must not be retightened.
Tightening diagram/bolt assignment
Left and right cylinder head M 113
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Tightening instructions for left and right cylinder heads M 113
Use
wrench bit to tighten cylinder head bolts.
Observe sequence, see tightening pattern.
If the tightening torque is exceeded on a cylinder head bolt, unscrew the cylinder head bolt, inspect shank length of the cylinder head bolt in question (replace bolt if necessary) and tighten again fully, beginning with stage 1.
Cylinder head bolts must not be retightened.