Discovery II
ENGINE - V8
12-2-18 REPAIRS
13. Remove cylinder head gasket.
Refit
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. Clean mating faces of
cylinder head and exhaust manifold.
CAUTION: Do not use a metal scraper or
machined surfaces may be damaged.
2. Check head and block faces for warping and
pitting. If out of specification, renew head.
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. Fit cylinder head gasket with the word 'TOP'
uppermost.
CAUTION: Gasket must be fitted dry.
5. Carefully fit cylinder head and locate on
dowels.
6. Lightly lubricate new cylinder head bolt threads
with clean engine oil.
7. 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 90
°
, and finally
a further 90
°
.
CAUTION: Do not tighten bolts 180
°
in one
operation.
8. 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.
9. Clean push rods.
10. Lubricate ends of push rods with clean engine
oil.
11. Fit push rods in their removed order.
12. Clean bases of rocker pillars and mating faces
on cylinder head.
13. Clean contact surfaces on rockers, valves and
push rods.
14. Lubricate contact surfaces and rocker shaft
with clean engine oil.
15. Fit rocker shaft assembly and engage push
rods.
16. Fit rocker shaft bolts and progressively tighten
to 40 Nm (30 lbf.ft).
17. Position alternator mounting bracket, fit bolts
and tighten to 40 Nm (30 lbf.ft).
18. Position auxiliary drive belt tensioner, fit bolt
and tighten to 45 Nm (33 lbf.ft).
19. Connect ht leads to spark plugs in their fitted
order.
20. Using new gaskets, fit exhaust manifold to
cylinder head. Fit bolts and using sequence
shown, tighten initially to 15 Nm (11 lbf.ft), then
finally tighten to 36 Nm (28 lbf.ft).
21. RH drive models: Fit brake servo heat shield.
SYSTEMS - V8, REPAIRS, Heat shield -
brake servo - Without Secondary Air
Injection.
22. Position engine earth lead, fit bolt and tighten to
22 Nm (16 lbf.ft).
23. Fit inlet manifold gasket.