Stiga TRE 0702 - Overhauling the Cylinder Head and Valves

Release 00 - 03/2018
pag. 36
Engine TRE 0701-TRE 0702-TRE 0801
Service manual
10. ENGINE BLOCK – External repairs
10.4 Overhauling the cylinder head and valves
NOTE - These paragraphs describe all the
operations for checking and overhauling
the cylinder head; it is left to the operator to
assess the advisability of performing all the
operations described or only part of them,
depending on the type of engine problems
encountered.
1 - Dismount the cylinder head [
10.3].
2 - Move the rocker arms (20); press down the spring
seal cap (21) and move it sideways to remove from
the valve stem (22).
IMPORTANT - The inlet and exhaust valves are diffe-
rentfromeachotherandcanbeidentiedbythe
marking «IN» (YI - inlet) and «EX» (YE - exhaust), on
the valve head.
3 -
Use an adequate tool to carry out the valve
removal procedure.
4 - Position the tool (23) onto the upper and lower
part of the valve as shown in the gure.
NOTE – The tool must be centered onto the
valve cup and stem part of the valve itself.
5 - Apply pressure with the tool onto the valve cup-
washer (25). The two half-cones (24) will pushed out
of their seat.
20
22
21
25
24
23
23
INDEX
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