Group
21
Reconditioning engine
Cylinder head, reconditioning
51661
5167^5165
5168]
E9
Select a new valve guide, one size larger than old
one
The valve guides are marked with grooves.
Valve guide
Standard +
Oversize 1
2
3
Mark
no groove
1 groove
2 grooves
3 grooves
Reamer
-
5166
5167
5168
5165
Ream seat for guide
See above table.
E10
EH
Heat cylinder head to approx.
150C.
(300 F)
E12
Cool valve guide to approx. -70C (-95°F)
Use liquid carbon
dioxide orequivalentto cool the
valve
guides.
Wear protective gloves and safety glasses.
E13
Press in new guide
Note!
This must be done very quickly, within 3-4
sees.
Place the cylinder head on a sloping surface so that the
valve guides are vertical.
Use drift 5108 for intake and 5109 for exhaust valve
guides.
E14
Clean inner surface of new valve guides
Use reamer 5224.
Reamer 5164 can also be used.
Valves and valve seats must be ground-in if guide has been
replaced.
48
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