Lotus Elise Service Notes page 190

ENGINE
18G 1576-1
18G 1576 3
K8 18G1576-4
1 K16 18G1576-2
8 R M 0 0 7 6 A
Valve seat inserts - renew
_ CAUTION: Triple angle valve seat inserts
/ ! \ have been introduced on later K16
engines; these inserts are not
interchangeable with those fitted to early
engines. Commencing engine numbers for
engines fitted with the new inserts are listed in
Information.
1. Renew valve seat inserts as necessary.
_ CAUTION: Do not damage counterbore
/ j \ when removing insert.
2. Cool replacement valve seat inserts using
liquid nitrogen and press into cylinder head in
one continuous operation.
A
CAUTION: Do not heat cylinder head.
A
NOTE: Cylinder head and valve guides
must be at room temperature when fitting
guides.
4. Locate valve guide in valve guide bore with
identification groove(s) towards valve seat;
position depth gauge :-
K8 - Use depth gauge 18G 1576-4.
K16 - Use depth gauge 18G 1576-2.
5. Position nylon guide 18G 1576-3 in cylinder
head, press guide into bore using driver 18G
1576-1 until depth gauge contacts top of valve
guide bore.
\
C
I/
\
"
J
B
I/
F
m
L H
*
H-*
" * — r — - I
8RM 1102A
8 R M 0 0 5 2
6. Check fitted height A of valve guide:-
K8 = 10.3 mm
K16 = 6.0 mm
OVERHAUL 5 3