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Task Descriptions 65
3.1.8 Cylinder head Tolerances
Cylinder head tolerances for heads with valve seat inserts and
exhaust emission certificationInlet and exhaust valve guides
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize
lower upper min. max. min. max.
0 19.000 H7
1 19.100 H7
Cylinder headbore
2 19.300 H7
0 +0.021
0 19.000 r6
1 19.100r6
1
Valve guideexternaldiameter
2 19.300 r6
+0.028 +0.041
+0.007 +0.041
Valve guide bore
installed
11.000 H7 0 +0.0182
Valve stemdiameter
10.935 0.010 +0.010
0.055 0.093
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66 Task Descriptions
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize
lower upper min. max. min. max.
Ready-to-usevalve guide bore
installed
11.000 H9 0 +0.0432
Valve stemdiameter
10.935 0.010 +0.010
0.055 0.118
Valve clearance
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize
lower upper min. max. min. max.
1 Valve protrusion
exhaust valve
with valve seatinsert
+0.100 up to max.1.000
2 Valve clearanceor protrusion
inlet valve
0.000 up to max.1.100
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Task Descriptions 67
Inlet and exhaust valve seat insert
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basic
size lower upper min. max. min. max.
1 Valve-seat insertbore, exhaust
57.000 H6 0 +0.019
2 Valve-seat insert- depth
11.200 0.050 +0.050
3 Valve-seat insertbore, inlet
58.000 H6 0 +0.019
Reconditioning note:
If a valve-seat insert is replaced before reaching the reconditioning depth of 1.100 mm, it must be machinedto the depth of the contour to avoid that the valve-seat insert protrudes into the combustion chamber.
Max. corrective machining or equalizing of valve-seat inserts by 0.300 mm in depth, without machining thecontour and the radius.
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68 Task Descriptions
Inlet and exhaust valve-seat insert
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basic
size lower upper min. max. min. max.
1 Plug gaugediameter
73.200 0 0
2 Plug gaugediameter
87.130 0 0
3 Valve seatsurface
referencedimension
plug gauge
4.800 0.200 +0.200 up to min.3.700
4 Cylinder headdepth
Combustionchamber sealingring surface
13.800 0 +0.100
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Task Descriptions 69
Inlet valve elliptical chamfer
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize lower upper min. max. min. max.
1 Distance to valveseat center
2.700 0.150 +0.150
2 Chamfer 0.300
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70 Task Descriptions
Exhaust valve
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basic
size lower upper min. max. min. max.
1 Valve head
externaldiameter
56.000 0.200 +0.200
Referencedimension
with ring gaugefor
valve seatdiameter
54.0002
Valve seat height 4.680
0.200 +0.100 up to min.3.480
3 Referencedimension
without ringgauge for
valve seat height
3.200 0.200 +0.100 up to min.3.000
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Task Descriptions 71
Inlet valve
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basic
size lower upper min. max. min. max.
1 Valve head
externaldiameter
57.000 0.200 +0.200
Referencedimension
with ring gaugefor
valve seatdiameter
54.0002
Valve seat height 4.050
0.200 +0.100 up to min.3.350
3 Referencedimension
without ringgauge for
valve seat height
3.200 0.200 +0.100 up to min.3.000
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72 Task Descriptions
Valve springs, outer
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize lower upper min. max. min. max.
1 Spring length
released
83.900
Spring length
compressed
66.0002
Spring lengthwhen mod. valverotator is used
65.100
2.1 Spring force
at compressedspring length
530.000 N
Spring length
compressed
51.7503
Spring lengthwhen mod. valverotator is used
50.850
3.1 Spring force atspring lengthpos. 3
952.000 N 39 N +39 N Springforce
min. 897.000 N
4 Spring length
block dimension
47.700 Blockdimension
max. 47.700
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Task Descriptions 73
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize
lower upper min. max. min. max.
5 Winding dia. 34.400
6 Wire dia. 5.300
e1 Permissible deviation of surface line from vertical with unloaded spring max. 2.500
e2 Spring seat, permissible parallelism deviation max. 0.600
Valve springs, inner
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basic
size lower upper
min. max.
min. max.
1 Spring length
released
78.400
Spring length
compressed
61.0002
Spring lengthwhen mod. valverotator is used
60.100
2.1 Spring forceat compressedspring length
256.000 N
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74 Task Descriptions
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize
lower upper min. max. min. max.
Spring length
compressed
46.7503
Spring lengthwhen mod. valverotator is used
45.850
3.1 Spring force atspring lengthpos. 3
466.000 N 19 N +19 N Springforce
min. 420.000 N
4 Spring length
Block dimension
42.500 Blockdimension
max. 42.500
5 Winding dia. 23.000
6 Wire dia. 3.600
e1 Permissible deviation of surface line from vertical with unloaded spring max. 2.300
e2 Spring seat, permissible parallelism deviation max. 0.400
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Task Descriptions 75
Cylinder head mating surface protective sleeve
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize lower upper min. max. min. max.
1 Cylinder headheight
184.000 0.100 +0.100 183.600
2 Protective sleevemating surface
124.000 0 +0.200
Protective sleevebore
44.200 0 +0.1003
Protective sleeve
external
diameter
44.100 0.100 0
0.100 0.300
4 Cylinder headand protectivesleeve thread
M 24 x 1.5
Reconditioning note: Rework only until a satisfactory mating surface has been achieved. When reconditioning cylinder head height, reestablish the fire side contour of 13.800 +0.100.
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76 Task Descriptions
Cylinder head screws
Deviation Clearance Interference Wear limitNo. Designation Repairsize
Tol. size
Basicsize lower upper min. max. min. max.
1 Cylinder headscrew withengine lifting eye
333.000 0.300 +0.300
2 Cylinder headscrew
283.000 0.300 +0.300
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