Fav 900
Engine / Cylinder head
Replacing valve seat insert
G
Repair
Fav 900 chassis number 23/3001and up
19.02.2001
2010 000010
G
a
1/2
Capitel Docu-No.
Index
Date Version
Page
Replacing valve seat insert
Text-module
Remove valve seat insert
Note:
When replacing valve seat inserts, it is advisable to replace valve guides, since this is the only
way to guarantee precise reseating of the new inserts.
A tool was therefore designed with which valve guidance and valve seat inserts can only be
replaced together, or alternately the valve guides alone.
PM-Picturemodule
PM-Picturemodule
PM-Picturemodule
PMTAB_Picture
Using a valve lathe machine a 3 - 4 mm
(.118-.157") wide groove in the valve valve seat
inserts.
Insert internal extractor claw in the machined
groove and tighten.
PMTAB_Picture
Note:
To prevent damage to the cylinder head face,
insert a washer (1) or other suitable object
underneath the feet (4) of the support legs.
Screw spindle (2) into extractor (5), align support
legs (4) and extract valve seat insert by turning the
nut (3).
Clean contact surface of insert in the cylinder
head.
PMTAB_Picture
If a valve lathe is not available, proceed as follows:
● Using an arc-welder, apply two welding beads
to the valve seat (arrowed).
● Extract valve seat insert.
● Clean insert contact surface in the cylinder
head.
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