Lotus Esprit Series - Page 136

ENGINE
Page E25
2.
Heat the whole cylinder head to a temperature
NOT EXCEEDING 200°C
and freeze the insert with dry ice to a temperott~re NOT LESS THAN minus
80°C.
3.
With the aid of Special Tool (05A or
06A), press the insert into place,
ensuring that the seat FACES TOWARDS the combustion chamber. Allow
the c
y
linder head to cool natirrally in the air.
4.
Re - build and refit the cylinder head.
VALVE GUIDES
Check the valve spring seat adjacent to each guide bore for a
'l', '2' or '5'
d,
stamping. This refers to the amount of oversize of the guide (.001 in, .002 in,
and
.005 in, res
p
ectively).
If this stomping is visible, then that size guide MUST be used as replacements.
To Remove
1.
Remove the cylinder head and dismantle as for decarbonising.
2.
tieot the whole c
y
linder head to a temperature of between 100/150~~
(212/303OF) and, with Special Tool (OM), knock the gl~ides out of the
head from the combustion chamber side.
To Replace
ct' 1. Heat the cylinder head to a temperature of between 100/150~~ (212/303OF). . i
2.
Locate a new
circlip on the new guide and press the guide into its bore
from the top, until the circlip seats com
p
letely in its recess. Care must be
taken that the guides are
NOT driven in further than this point. See
TECHNICAL DATA for fitted hei
g
ht.
3.
Ream the guide AFCER fitting, to the dimension given in TECHNICAL DATA.
Recut the volve seat to ensure that it is concentric with the valve stern bore.
4.
Re - build and refit the cylinder head to the engine.
ESPRIT
Issue 04/78