Lotus Elise Service Notes page 187

ENGINE
Cylinder head - inspection Valve springs - inspection
1. Check cylinder head for damage, pay particular
attention to gasket face of cylinder head.
1. Check condition of valve springs:
A
NOTE: Valve springs are either colour
coded or plain:
8HM 3628
2. Check cylinder head face for warping, across
centre and from corner to comer:
Cylinder head:
Maximum warp = 0.05 mm
3. Check cylinder head height:
New = 118.95 to 119.05 mm.
Cylinder heads may be refaced.
Reface limit = 0.20 mm
~ CAUTION: Cylinder heads fitted to K16
/ j \ engines with automatic timing belt
tensioners are not interchangeable with
those fitted to engines with manual tensioners.
K8 - Yellow/red
K16 - Non VVC engines - Plain
K16 - VVC engines - Blue
KB
Free length = 46.2 mm
Fitted length = 37.0 mm
Load - valve closed = 255 ± 12 N
Load - valve open = 535 ± 20 N
K16 - Non VVC engines
Free length = 50.0 mm
Fitted length = 37.0 mm
Load - valve closed = 250 ± 12 N
Load - valve open = 450 ± 18 N
K16 - VVC engines
Free length = 47.6 mm
Fitted length = 37.0 mm
Load - valve closed = 210 ± 13 N
Load - valve open = 440 ± 22 N
5 0 OVERHAUL