Lotus Elise S1 Service Notes page 189

ENGINE
K8 Valve guides - renew
Valve stem diameter A:
Inlet = 6.960 to 6.975 mm
Exhaust = 6.952 to 6.967 mm
Valve guides:
Inside diameter B:= 7.000 to 7.025 mm
Valve stem to guide clearance C:
Inlet = 0.025 to 0.065 mm
Service limit = 0.07 mm
Exhaust = 0.033 to 0.073 mm
Service limit = 0.11 mm
1. Support cylinder head face down on wooden
blocks.
K16
Valve stem diameter A:
Inlet = 5.952 to 5.967 mm
Exhaust = 5.947 to 5.962 mm
Valve guides:
Inside diameter B:= 6.000 to 6.025 mm
Valve stem to guide clearance C:
Inlet = 0.033 to 0.063 mm
Service limit = 0.07 mm
Exhaust = 0.038 to 0.078 mm
Service limit = 0.11 mm
18G 1576-1
18Q 1576 3
8RM 0077 A
10. Renew valves and guides as necessary
2. Position tool guide 18G 1576-3 in tappet bore
and drift out valve guide using tool dnft 18G
1576-1.
NOTE: Retain valve guides in their fitted
order.
A B
C
D
12M0007
3. Identify type of valve guide fitted:-
A - Standard production
C - Production oversize
A
NOTE: Two replacement sizes of valve
guide are available, sizes B and D, replace
original guide A with B and original guide
C with D.
5 2 OVERHAUL