19
COMPILER TECO/ATI ENDORSEDDATE
14.07.2003
REG. CODE
1-5302-612
MODEL N°
50894
DATE OF ISSUE
07-03
REVISION 00
X
10
11
12
c mm
13,025÷13,037
a mm
6,960÷6,970
6,945÷6,955
b mm
7,00÷7,01
e mm
13÷13,01
d mm
0,8÷1,0
Guide
Inlet
Exhaust
assembly
Cylinders heads
Parts shown in figure 10.
1. Head - 2. Tappets - 3. Valves - 4. Seats - 5. Guides - 6. Seals - 7.
Lower washers - 8. Springs - 9. Top washers - 10. Valve locking
split cones - 11. Rocker arms - 12. Rocker pins - 13. Gaskets - 14.
Push rods - 15. Pipe covers 16. O-ring - 17. Camshaft.
The heads are in aluminium with valve guides and seats in cast
iron.
Do not disassemble the head when the engine is hot to
avoid deformation.
Clean heads of carbon deposits and check the cylinder mating
surfaces; if the are deformed they must be ground to a maximum of
0.3mm. Check that there are no cracks or other imperfections in the
heads. If defects are encountered the heads must be renewed. In
this case consult the spare parts catalogue.
Valves - Guides - Seats
Clean the valves with a wire brush and renew them if the valve
heads are deformed, cracked or worn.
Check the dimensional conformity of the valve stems (fig. 12) and
the clearance between valve and guide, bore out the guides to the
dimensions indicated in the table (fig. 11).
Renew both guide and valve if the clearance is greater than 0.1mm.
It is always necessary to grind the valve seats when new guides are
fitted.
Oversize valve guides with external diameter increased by 0.10 are
available.
CHECKS AND OVERHAUL
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