4
Replacing valve seat insert
92
Installing valve seat insert
Fig. 4
Heat cylinder head to approx. 80_C (175_ F) in
water bath.
Cool new valve seat insert to approx. –200_C
(–330_F) and insert it in the cylinder head.
Carry out check by driving it in until the stop is
reached using pressing tool.
Install valve guides.
Note:
When the valve seat inserts have been
changed, the valve seats must be reworked.
3534
Notes:
D After temperature equalization, machine valve seats.
D After machining, clean cylinder head and check for leaks using leak testing device.
D If the cylinder head is excessively heated (above +200_C, +390_F) the core hole covers (end
covers) loose their tightness and must be exchanged.
D To do this, clean core holes, blow out channels and press in new core hole covers with
”LOCTITE 648” and pressing mandrel (special tool, see page 133).
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