Discovery 2. Manual — part 51

ENGINE - V8

OVERHAUL 12-2-77

Camshaft

$% 12.13.02.01

Disassembly

1. Remove inlet manifold gasket.

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ENGINE - V8, OVERHAUL, Gasket -

inlet manifold.

2. Progressively loosen and remove 8 bolts

securing rocker shaft assemblies.

3. Mark each rocker shaft in relation to original

head.

4. Remove rocker shaft assemblies.
5. Remove push rods and store in their fitted

order.

6. Remove tappets.

CAUTION: Store tappets upright and in their
fitted order.

7. Remove timing chain and gears.

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ENGINE - V8, OVERHAUL, Timing

chain and gears.

8. Temporarily fit camshaft gear and lightly tighten

bolt.

9. Attach a dial test indicator (DTI) to front of

cylinder block with stylus of DTI contacting
camshaft gear.

10. Push camshaft rearwards and zero the DTI.
11. Using the camshaft gear, pull camshaft

forwards and note reading on DTI. End-float
should be from 0.075 to 0.25 mm (0.003 to
0.010 in).

12. If end-float is incorrect, fit a new thrust plate. If

end-float is still incorrect, a new camshaft/gear
must be fitted.

13. Remove camshaft bolt and gear.
14. Remove 2 bolts securing camshaft thrust plate

and remove thrust plate.

15. Carefully remove the camshaft avoiding

damage to the camshaft bearings.

ENGINE - V8

12-2-78 OVERHAUL

Reassembly

1. Clean camshaft bearings in block.
2. Clean camshaft.
3. Wipe camshaft bearing faces and lobes.
4. Clean thrust plate and mating face.
5. Lubricate camshaft bearings with clean engine

oil.

6. Fit camshaft, take care not to damage camshaft

bearings.

7. Lubricate thrust plate and mating face with

clean engine oil.

8. Position thrust plate, fit and tighten bolts to 22

Nm (17 lbf.ft).

9. Fit timing chain and gears.

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ENGINE - V8, OVERHAUL, Timing

chain and gears.

10. Immerse tappets in engine oil. Before fitting,

pump the inner sleeve of tappet several times
using a push rod to prime the tappets.

11. Clean tappet bores.
12. Lubricate tappets and tappet bores with clean

engine oil.

13. Fit tappets.
14. Clean push rods.
15. Lubricate tappet end of push rods with clean

engine oil.

16. Fit push rods.
17. Clean bases of rocker pillars and mating faces.
18. Clean contact surfaces on rockers and valves.
19. Lubricate contact surfaces on rockers and

valves with clean engine oil.

20. Fit rocker shafts and engage push rods. Ensure

rockers shafts are fitted to the correct cylinder
head.

21. Fit and progressively tighten rocker shaft bolts

to 40 Nm (30 lbf.ft).

22. Fit inlet manifold gasket.

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ENGINE - V8, OVERHAUL, Gasket -

inlet manifold.

EMISSION CONTROL - V8

DESCRIPTION AND OPERATION

17-2-1

EMISSION CONTROL - V8

DESCRIPTION AND OPERATION

Crankcase emission control system

1 Intake air
2 LH rocker cover breather tube

3 Oil separator in RH rocker breather tube

EMISSION CONTROL - V8

17-2-2

DESCRIPTION AND OPERATION

Exhaust emission control

1 RH catalytic converter
2 Heated oxygen sensors – post-catalytic

converter (2 off – NAS only)

3 LH catalytic converter
4 Heated oxygen sensors – pre-catalytic

converter (2 off)