Valve Tappet Bores; Cylinder Head; Valve Seat - Mercedes-Benz Unimog 435 Service Manual

General
01.8
352/352 A
Valve tappet bores
Normal Repair stage 1 Repair stage 11 Repair stage III
mm mm
mm
mm
28,033 28,233 28,533
28,783
28,000 28,200 28,500
28,750
Cylinder head
Overall height of cylinder head mm
92,10
91,90
Permissible material allowance
mm 1,00
lengthwise mm
0,05
Permissible roughness of mating surface
crosswise
mm
0,015
Permissible parallel misalignment
lengthwise mm 0,10
of upper to lower mating surface
Pressure test in water
bar 2.5
Nozzle projection relative to lower edge of cylinder head
mm 1.8 to 2.5
Peak-to· valley height of lower mating surface mm 0,008 up to 0,016
Valve sea!
Exhaust
~-------- a ------~~
l---
a
Valve seat ring diameter
a
Inlet
mm 42
±
0,01
for new rings
Exhaust mm
34+ 0,01
Inlet
mm 1,6 up to 2,0
Width b
Exhaust mm 2,0 up to 2,5
Inlet mm
2,8 + 0,2
Reference dimension
C
Exhaust
mm 2,6 + 0,2
Permissible runout 01 valve seat
mm 0,03
Distance between cylinder head
Inlet mm
0,7 + 0,5
mating surface and valve head
Exhaust
0,7 + 0,5
mm
Valve seat angle
Inlet and exhaust
·
45.- 10 '
- 20'
Inside Inlet
·
60·
Exhaus!
·
75·
Correction cut
Outside Inlet
·
30·
and exhaust
Valve seat rings must be renewed il the machining limit is exceeded when remachining the valve seat.
UKD 30 402 21 42 - 04
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