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
2/2
Capitel
Docu-No.
Index
Date
Version
Page
Replacing valve seat insert
PM-Picturemodule
Text-module
Note:
After cooling down: re-machine valve seats.
After re-machining: clean cylinder head and check for leaks with a cylinder detector.
Overheating of the cylinder head (above +200
°
C / 392
°
F ) causes the core plugs to become loose,
and they must be replaced.
To do this, clean core holes, blow out ducts and press in new core plugs using a mandrel and
"LOCTITE 270".
PMTAB_Picture
Replacing valve seat insert
Immerse cylinder head in a hot water bath and
heat up to approx. 80
°
C (176
°
F).
Supercool new insert to approx -200
°
C (-328
°
F)
and insert into the cylinder head.
When the temperature has equalized, check by
pressing in a mandrel to the end position.
Refit valve guides.
Note:
When replacing the valve seat inserts, it is
necessary to re-machine valve seats.
