Cylinder Head, As>Built Configuration; Tightening Procedure For Cylinder Head - Mercedes-Benz OM 471 Introduction Into Service Manual

GF01.30>W>0800H
ENGINES 471.9
The engine OM 471 has a one>piece cylinder head.
There are two intake valves and two exhaust valves for each
cylinder in the cylinder head. The narrow engine design means
that overall a symmetrical location of the valves can ensue. This
symmetrical valve pattern is optimum for the combustion.

Tightening procedure for cylinder head

bolts
1 > 38
Cylinder head bolt (M15¥2)
Cylinder head bolts
In order to ensure that the correct bolts are used when installing
the cylinder head, on each bolt head there is an embossing which
provides information on the thread strength of the respective
cylinder head bolt.
The cylinder head bolts have the M15 2 thread and therefore have
the embossing "15".
All the cylinder head bolts must be tightened in four stages as per
a set tightening pattern. The tightening torques and the
tightening angle can be obtained from the repair instructions.
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
Cylinder head, as>built configuration
39 Bolt (M10)
– This printout will not be recorded by the update service. Status: 09 / 2011 –
As>built configurations
40 Bolt (M10)
As the cylinder head bolts elongate due to assembly, the shank
length for each bolt which has already been used once must be
measured before it is reassembled.
The relevant bolt must be replaced when the permissible shank
length is exceeded.
i The cylinder head bolts are no longer assembled when the
valve assembly is mounted. The valve assembly must be removed
before dismantling the cylinder head.
1.7.11
W01.30>1105>78
13