Discovery II
ENGINE - V8
OVERHAUL 12-2-63
Cylinder head - overhaul
$% 12.29.19.01
Disassembly
1. Remove cylinder head gasket.
ENGINE - V8, OVERHAUL, Gasket -
2. Loosen screw on tool LRT-12-034.
3. Fit tool LRT-12-034 to valve and tighten screw
to compress valve spring sufficiently to release
collets from valve spring cap.
4. Remove 2 collets and release valve spring
compressor.
5. Remove valve spring cap and valve spring.
6. Remove valve from cylinder head.
7. Remove and discard valve stem oil seal.
8. Repeat above operations for remaining valves.
9. Keep valves, springs, caps and collets in their
fitted order.
Inspect
1. Clean mating faces of cylinder block and head
using suitable gasket removal spray and a
plastic scraper, ensure that bolt holes in block
are clean and dry.
CAUTION: Do not use a metal scraper or
machined surfaces may be damaged.
2. Clean cylinder head, valve springs, valves and
inlet valve guide bores. Ensure all loose
particles of carbon are removed on completion.
3. Models with SAI: Using a 5/8 in x 20 TPI (
threads per inch) UNF tap having a class 2A
thread, remove deposits from secondary air
injection adapter tappings in cylinder head.
CAUTION: Ensure that tap used has 20 TPI.
4. Check head and block faces for warping and
pitting. Maximum warp = 0.05 mm (0.002 in).
5. Check cylinder head height at each end of
head. Renew a head which is outside limits.
a 22.94 mm (0.903 in) - New
b 62.56 mm (2.463 in) - New
