Discovery II
ENGINE - V8
12-2-62 OVERHAUL
10. Remove cylinder head gasket.
CAUTION: Support both ends of cylinder
head on blocks of wood.
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. Check head and block faces for warping and
pitting.
l
Maximum cylinder head warp = 0.05 mm
(0.002 in).
Note: Cylinder head can be refaced to 0.50
mm (0.02 in) maximum below head height –
See cylinder head overhaul.
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.
Reassembly
1. Ensure that cylinder head bolt holes are clean
and dry.
2. Fit cylinder head gasket with the word TOP
uppermost.
CAUTION: Gaskets must be fitted dry.
3. Carefully fit cylinder head and locate on
dowels.
4. Lightly lubricate new cylinder head bolt threads
with clean engine oil.
5. Noting that bolts 1, 3 and 5 are longer than the
remainder, fit bolts and tighten in the sequence
shown to 20 Nm (15 lbf.ft) then turn through 90
°
, then a further 90
°
. CAUTION: Do not
tighten bolts 180
°
in one operation.
6. Models with SAI: Fit new air injection adapters
and using a 9 mm hexagonal drive bit, tighten
to 33 Nm (24 lbf.ft).
CAUTION: Do not use an air tool to tighten
adapters.
7. Clean the push rods, Lubricate ends of push
rods with clean engine oil, and fit in their
removed order.
8. Clean bases of rocker pillars and mating faces
on cylinder head.
9. Clean contact surfaces on rockers, valves and
push rods.
10. Lubricate contact surfaces and rocker shaft
with clean engine oil.
11. Fit rocker shaft assembly and engage push
rods.
12. Fit rocker shaft bolts and progressively tighten
to 40 Nm (30 lbf.ft).
13. Connect ht leads to spark plugs in their correct
fitted order.
14. RH cylinder head: Position alternator
mounting bracket, fit bolts and tighten to 40 Nm
(30 lbf.ft).
15. RH cylinder head: Fit auxiliary drive belt
tensioner.
16. Fit inlet manifold gasket.