Workshop Manual

REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION 00
DATE
10.06.99
ENDORSED
COMPILER TECO/ATI
34
DISASSEMBLY/REASSEMBLY
VIII
Valve seats and housings
Dimensions (mm)
A = 34.020 to 34.045
B = 34.106 to 34.115
C = 30.020 to 30.041
D = 30.108 to 30.116
aa
aa
a = 44°53' to 45°
aa
aa
a1 = 59°53' to 60°
Insert the seats in their housings
Note: Since they are pre-finished, the seats must
no longer be
machined after insertion.
Valve recessing and width of housing seal.
Dimensions (mm)
D = 0.5 to 0.8 D (wear limit) = 1.1
S = 1.6 to 1.7 S (wear limit) = 2.0
Grind the valves in their seats with fine emery paste.
After grinding, check the recess of valves D in relation to the head
surface and the retention width of seat S.
Old engine oil can cause skin cancer if repeatedly left in contact
with the skin and for long periods of time. If contact with the oil
is unavoidable, you are advised to wash your hands with soap
and water as soon as possible.
Dispose of old oil in the correct way as it is highly polluting. Do
not litter.
Oil sump, removal
Remove the fixing screws.
Insert blade 1 into the front and rear main bearing zone to detach
the sump from the engine block.
Remove the silicone from the main bearing seals.
Apply silicone of the " Dow Corning 7091" type when remounting,
as shown in the figure.
Tighten the fixing bolts to a 10 Nm torque.
Before starting the engine, make sure that:
1) the oil drain plug on the sump has been tightened in the
correct way
2) that the right quantity of oil has been added (see pages 13
and 17).
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63 64
65 66