Fav 900
Engine / Cylinder head
Removing and refitting valves
G
Repair
Fav 900 chassis number 23/3001 and up
19.02.2001
2010
000008
G
a
1/3
Capitel
Docu-No.
Index
Date
Version
Page
Removing and refitting valves
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PMTAB_Picture
Removing valves
Remove rocker arm assembly and cylinder head
(Chapter 2010 Reg G).
Note:
Valve springs and spring plates can be
replaced without removing the cylinder head.
This requires the appropriate piston to be at
TDC.
The use of a valve fitting tool is necessary.
●
Place fitting lever to cylinder head.
●
Turn screw (1) until the lever (2) is slightly
raised.
PMTAB_Picture
Note:
If a valve bench is available, this can be used
for the above operations.
●
Push valve fitting lever down and remove valve
collets.
●
Lift lever and swing to one side Caution:
Beware of spring tension. Danger of injury !
●
Remove upper spring plate (2), valve spring (3)
and washer (4).
●
Turn cylinder head over and extract intake (5)
exhaust (6) valve.
●
Check valves for damage and replace weak
springs.
●
Measure valve spring and replace weak
springs.
●
Check valve stem and guides for scoring and
wear; if necessary, measure guides with a plug
gauge.
●
Check valve seats for severe wear and signs of
burning, if necessary reseat valves or replace
the insert.
●
Remachine valve seat (following grinding
machine manufaturer's instructions), or
replace.
PMTAB_Picture
Refitting valves
Lubricate valve stems and insert into valve guides.
Note:
Minor valve seating damage can be removed
by reseating using a valve grinding paste.
When fitting new valves these must be
reseated so that uniform seating is attained, if
necessary machine the valve seat insert.
