1999 LAND ROVER DEFENDER light

ENGINE
21
DESCRIPTION AND OPERATION Oil pressure switch
The oil pressure switch is located in a port on the outlet side of the oil cooler housing. It detects when a safe
operating pressure has been reached during engine starting and initiates the illumination of a warning light in the
instrument pack if the pressure drops below a given value.
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12ENGINE
2
REPAIR
13.Position camshaft in camshaft carrier.
14.Check end-float of camshaft using a DTI.
Camshaft end-float = 0.06 to 0.16 mm (0.002 to
0.006in).
15.Renew components as necessary to achieve
correct end-float.
CAUTION: Cylinder head and camshaft
carrier are machined together as an
assembly. If bearing surfaces in either
component are found to be damaged, complete
assembly must be replaced.
NOTE: The procedure for checking
camshaft bearing clearances is covered in
Td5 Engine Overhaul section - Cylinder
head - overhaul.Refit
16.Using a suitable cleaning solvent, clean mating
faces of cylinder head and camshaft carrier.
17.Blow out all oilways and waterways.
18.Ensure threaded holes in cylinder head and
camshaft carrier are clean and dry.
CAUTION: Support each end of the
cylinder head on blocks of wood. With
camshaft carrier bolted down some valves
and the injector nozzles will protrude from the
face of cylinder head.
19.Fit new adjusting screws fully into rocker arms.
Fit new lock nuts to screws but do tighten.
CAUTION: Ensure screws are correct for
type of rocker arms fitted. Replacement
screws for Engine Serial No. Prefixes 15P
to 19P have a centre punch mark adjacent to the
adjusting screw slot. These screws are not
interchangeable with those fitted to Engine Serial
No. Prefixes 10P to 14P.
20.Lubricate cams and bearing journals on
camshaft, cylinder head and camshaft carrier
with clean engine oil.
21.Position camshaft in cylinder head with the
timing pin hole in the vertical position.
22.Apply an even film of sealant, Part No. STC
4600 to camshaft carrier face as shown and
spread to an even film using a roller.
CAUTION: Ensure sealant does not block
oilways (arrowed) or contaminate
camshaft bearings. Assembly and bolt
tightening must be completed within 20 minutes
of applying sealant.
23.Fit camshaft carrier ensuring that it is correctly
located on dowels.
24.Fit and lightly tighten camshaft carrier bolts.
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12ENGINE
10
REPAIR Refit
39.Clean mating faces of cylinder head and cylinder
block.
40.Check cylinder head for warping, across centre
and from corner to corner:
Maximum warp = 0.10 mm (0.004 in)
CAUTION: Cylinder heads may not be
refaced, replace cylinder head assembly if
warping exceeds figure given.
41.Ensure coolant and oil passages are clean.
42.Clean dowel holes and fit new dowels.
43.Fit new cylinder head gasket of the correct
thickness with the word’TOP’uppermost.
44.Using assistance, fit cylinder head and locate on
to dowels.
45.Carefully enter new cylinder head bolts together
with their captive washers,DO NOT DROP.
Lightly tighten bolts.
46.Using sequence shown, tighten cylinder head
bolts to:-
Stage 1 -30 Nm (23 lbf.ft)
Stage 2 -65 Nm (48 lbf.ft)
Stage 3 -90°
Stage 4 -Further 180°
Stage 5 -Further 45°
CAUTION: Ensure correct tightening
sequence is followed for all 5 tightening
stages. Do not tighten bolts 315°in one
operation.
47.Fit nut and bolt securing cylinder head to timing
chain cover and tighten to25 Nm (18 lbf.ft).
48.Clean camshaft sprocket and mating face on
camshaft.
49.Ensure engine is set to TDC No. 1 cylinder and
mark on camshaft sprocket is positioned
between the 2 coloured links.
50.Position camshaft sprocket to camshaft, fit and
lightly tighten new bolts then loosen bolts half a
turn.
51.Clean fixed guide retaining pin and apply Loctite
242 to threads.
52.Fit and tighten fixed guide retaining pin to25 Nm
(18 lbf.ft).
53.Clean timing chain tensioner and fit new sealing
washer.
54.Fit timing chain tensioner and tighten to45 Nm
(33 lbf.ft).
55.Tighten camshaft sprocket retaining bolts to36
Nm (27 lbf.ft).
56.RemoveLRT-12-058from camshaft.
57.RemoveLRT-12-158from gearbox bell housing.
58.Clean access plug recess in cylinder head and
fit new’O’ring. Fit access plug.
59.Clean vacuum pump union.
60.Tighten vacuum pipe union to10 Nm (7lbf.ft).
61.Fit bolts securing alternator bracket to cylinder
head and tighten to25 Nm (18 lbf.ft).
62.Connect top hose, heater hoses and secure with
clips.
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ENGINE
27
REPAIR Refit
9.Clean sump and mating faces.
10.Apply a bead of sealant, Part No. STC 3254 to
joint faces of timing chain cover and crankshaft
rear oil seal.
11.Position new sump gasket.
CAUTION: Gasket must be fitted dry.
12.Position sump, fit bolts ensuring they are in their
correct fitted position, lightly tighten bolts.
13.Fit bolts securing sump to gearbox bell housing
and tighten to15 Nm (11 lbf.ft).
14.Using sequence shown, tighten sump bolts to25
Nm (18 lbf.ft).
15.Tighten sump to gearbox bell housing bolts to50
Nm (37 lbf ft).
16.Fit new gasket to centrifuge drain pipe and
tighten bolts to10 Nm (7 lbf.ft).
17.Fit exhaust front pipe.See MANIFOLD AND
EXHAUST SYSTEM, Repair.
18.Refill engine with oil.
19.Reconnect battery negative lead.
20.Refit battery cover.
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ENGINE
5
OVERHAUL Refit
1.Thoroughly clean cylinder block and cylinder
head mating faces.
2.Ensure coolant and oil passageways are clear
and bolt holes are clean and dry.
3.Ensure locating dowel holes in cylinder block are
clean and dry.
4.Fit new plastic locating dowels in cylinder block.
5.Fit new cylinder head gasket of the correct
thickness with the word’TOP’uppermost.
CAUTION: Gasket must be fitted dry.
6.Ensure that camshaft timing pinLRT-12-158is
still in position and using assistance, fit cylinder
head.
7.Carefully enter new cylinder head bolts together
with their captive washers,DO NOT DROP.
Lightly tighten bolts.
CAUTION: Cylinder head bolts are
pre-lubricated and do not require
additional lubrication.
8.Using sequence shown, tighten cylinder head
bolts to:
Stage 1 -30 Nm (23 lbf.ft)
Stage 2 -65 Nm (48 lbf.ft)
Stage 3 -90
°
Stage 4 -Further 180°
Stage 5 -Further 45°
CAUTION: Ensure correct tightening
sequence is followed for all 5 tightening
stages. Do not tighten bolts 315°in one
operation.9.Fit cylinder head to timing chain cover nut and
bolt and tighten to25 Nm (18 lbf.ft).
10.Clean camshaft sprocket and mating face on
camshaft.
11.Ensure engine is set to TDC firing - No.1
cylinder.
12.Check that mark on camshaft sprocket is
positioned between the 2 coloured links on
timing chain.
13.Position sprocket to camshaft, fit and lightly
tighten 3 new bolts then loosen bolts half a turn.
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ENGINE
7
OVERHAUL CYLINDER HEAD GASKET SELECTION
NOTE: There are three thicknesses of
cylinder head gasket available and in order
that the correct gasket is fitted, it will be
necessary to determine the stand proud
(protrusion) of each piston above the top face of
the cylinder block. Gaskets have either 1, 2 or 3
identification holes and the following procedures
must be followed in order that the correct gasket
is selected.
1.Temporarily fit and lightly tighten a new
crankshaft pulley bolt.
2.Assemble a magnetic base DTI to cylinder block
top face adjacent to No. 1 cylinder bore.
3.Position stylus to cylinder block top face and
zero gauge.
4.Using crankshaft pulley bolt, rotate crankshaft in
a clockwise direction until No.1 piston is at TDC -
Woodruff key slot in crankshaft is at 12 o’clock.5.Position stylus of DTI at edge of piston and
directly over gudgeon pin axis.
6.Measure and record No.1 piston protrusion.
CAUTION: Measurement must be taken at
front and rear of piston.
7.Establish average of the 2 readings taken.
8.Repeat above procedures for remaining pistons.
9.From readings obtained, determine HIGHEST
piston protrusion figure and select the
appropriate cylinder head gasket:
Piston protrusion = 0.351 to 0.50 mm (0.014 to
0.02 in) - Select the 2 hole gasket.
Piston protrusion = 0.501 to 0.57 mm (0.021 to
0.022 in) - Select the 1 hole gasket.
Piston protrusion = 0.571 to 0.65 mm (0.022 to
0.025 in) - Select the 3 hole gasket.
10.Remove DTI.
11.Fit cylinder head gasket.See this Section.
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12ENGINE
18
OVERHAUL
4.Assemble valves, springs and valve spring caps
ensuring that they are in their original fitted
order.
5.Compress valve springs using toolLRT-12-034,
fit collets.
6.Using a wooden dowel and mallet, tap each
spring cap lightly to seat collets.
7.Lubricate new injector’O’rings with engine oil.
8.Using toolLRT-12-154/2, fit’O’ring to each
injector.
9.Using toolLRT-12-154/3, fit new sealing washer
to each injector.
10.Support each end of cylinder head on blocks of
wood.
CAUTION: Ensure blocks are clear of
valves.
11.Position reaction posts in their original fitted
order.
12.Carefully fit EUI’s, ensuring they are in their
original fitted order and that each retainer is
located on its dowel.
CAUTION: If new EUI’s are fitted, ensure
replacements are correct. Engine Serial
No. Prefixes 10P to 14 - Push rod bushes
are coloured BLACK or BLUE. Engine Serial No.
Prefixes 15P to 19P - Push rod bushes are
coloured GREEN.
13.Fit new retainer bolts and tighten to32 Nm (24
lbf.ft).
CAUTION: If new injectors are fitted they
must be programmed for use with the ECM
using Testbook.
14.Lubricate lash adjusters and bores with engine
oil.
15.Fit lash adjusters ensuring they are in their
original fitted order.
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ENGINE
19
OVERHAUL 16.Lubricate finger followers with engine oil.
17.Fit finger followers ensuring they are in their
original fitted order.
18.Lubricate cams and bearing journals on
camshaft, cylinder head and camshaft carrier
with engine oil.
19.Position camshaft in cylinder head with the
timing pin hole in the vertical position.
20.Apply an even film of sealant, Part No. STC
4600 to camshaft carrier face and spread to an
even film using a roller.
CAUTION: Ensure sealant does not block
oilways (arrowed) or contaminate
camshaft bearings. Assembly and bolt
tightening must be completed within 20 minutes
of applying sealant.
21.Fit camshaft carrier ensuring it is correctly
located on dowels.
22.Fit and lightly tighten new camshaft carrier bolts.
23.Using sequence shown, progressively tighten
bolts to25 Nm (18 lbf.ft).
24.Lubricate a new camshaft rear oil seal with
engine oil, fit seal using a suitable mandrel.
25.Position rocker shaft on camshaft carrier,
ensuring rocker shaft is located on dowel.
26.Fit new rocker shaft retaining bolts and working
from the centre outwards, tighten bolts
progressively to32 Nm (24 lbf.ft).27.Lubricate a new’O’ring with engine oil and fit to
injector harness multiplug.
28.Fit injector harness and connect multiplugs.
29.Clean fuel connector block and mating face.
30.Lubricate a new fuel filter’O’ring with engine oil.
31.Fit new fuel filter,’O’ring and gasket.
CAUTION: Gasket must be fitted dry.
32.Fit fuel connector block spacer and gasket (if
fitted).
33.Fit fuel connector block, fit bolts and tighten to
25 Nm (18 lbf.ft).
34.Clean glow plugs.
35.Fit glow plugs to cylinder head and tighten to16
Nm (12 lbf.ft).
36. Engine Serial No. Prefixes 15P to 19P:-
Lubricate new’O’rings with engine oil and fit to
spill return pipe; fit pipe and tighten connectors
to20 Nm (15 lbf.ft).
37.Fit new cylinder head gasket.See this Section.
CAUTION: Ensure that the fuel injector
rockers are adjusted following the
procedures given in Gasket - Cylinder
head - Refit.
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