1999 LAND ROVER DEFENDER engine

12ENGINE
8
OVERHAUL CYLINDER HEAD - OVERHAUL
Service repair no - 12.29.19.01
Dismantling
1.Remove cylinder head gasket.See this
Section.
CAUTION: Due to the design of the
cylinder head which incorporates drillings
for the fuel injection system, it is important
that absolute cleanliness is adhered to when
carrying out overhaul procedures.
2.Note the gasket thickness indicator and ensure
the same thickness gasket is used on refitment
of cylinder head.
CAUTION: If new pistons, connecting rods
or crankshaft are fitted, it will be
necessary to determine thickness of
gasket required.See this Section.
3.Remove 4 glow plugs.
4.Disconnect multiplugs from EUI’s and remove
harness from camshaft carrier. Remove and
discard’O’ring from harness multiplug.
5.Loosen lock nuts and fully unscrew rocker
adjusting screws; discard locknuts and screws.
6.Remove and discard 6 bolts securing rocker
shaft, remove shaft.
NOTE: Dowel located.
7.Using sequence shown, progressively loosen 13
bolts securing camshaft carrier to cylinder head
until valve spring pressure is released; remove
bolts.
CAUTION: Do not discard bolts at this
stage.
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ENGINE
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OVERHAUL
8.Gently tap camshaft carrier upwards to break
sealant bond, remove carrier.
NOTE: Dowel located.
9.Remove camshaft.
10.Remove and discard camshaft rear oil seal.
11.Remove finger followers and lash adjusters.
CAUTION: Store lash adjusters and finger
followers in their fitted order and store
lash adjusters upright. Maintain absolute
cleanliness when handling components.
12.Remove and discard 5 bolts securing EUI
retainers.
13.Using toolLRT-12-154/1remove EUI units from
cylinder head and collect retainers. Remove
reaction posts and keep in their fitted order.
14.Using toolLRT-12-154/4, remove and discard
sealing washer and’O’ring from each EUI unit.
15.Support cylinder head clear of valves, use a
hollow drift and tap each valve spring cap to free
collets.
16.Using toolLRT-12-034, compress valve spring.
17.Remove 2 collets from valve stem using a stick
magnet.
18.Remove toolLRT-12-034.
19.Remove valve spring cap, valve spring and
valve.
CAUTION: Keep components in their fitted
order.
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12ENGINE
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OVERHAUL
20.Using toolLRT-12-071, remove and discard
valve stem oil seal.
21.Repeat above operations to remove remaining
valves.
22. Engine Serial No. Prefixes 15P to 19P:-
Disconnect spill return pipe from cylinder head
and fuel connector block, remove and discard’O’
rings.
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ENGINE
11
OVERHAUL
23.Remove 3 bolts and remove fuel connector
block from cylinder head.
24.Remove and discard gasket,’O’ring and fuel
filter.
25.Remove spacer block and gasket (if fitted).Cylinder head and camshaft carrier - cleaning
1.Thoroughly clean cylinder head mating faces,
ensure oil and coolant passages are clear and
bolt holes are clean and dry.
CAUTION: Take care to ensure that EUI
drillings are clear.
2.Using suitable solvent, remove all traces of
sealant and gasket material.
CAUTION: Do not use metal scrapers.
3.Remove all traces of oil from camshaft bearings
and journals.
4.Clean glow plug threads.
Cylinder head - Inspection
1.Check core plugs for signs of leakage and
corrosion, seal replacement plugs with Loctite
243.
2.Check cylinder head for warping across centre
and from corner to corner.
Maximum cylinder head warp =0.1 mm (0.004
in).
CAUTION: Cylinder heads may not be
refaced, replace the head assembly if
warping exceeds the limit given.
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12ENGINE
12
OVERHAUL Lash adjusters and finger followers - Inspection
1.Check lash adjuster bores for scoring and signs
of wear or damage.
2.Check lash adjusters for signs of wear, scoring
and overheating, replace as necessary. Ensure
oil hole in each lash adjuster is clear.
CAUTION: Store lash adjusters upright
and in their fitted order.
3.Check finger followers for wear and that rollers
are free to rotate.
CAUTION: Store finger followers in their
fitted order.
Camshaft - Inspection
1.Check camshaft lobes and bearing journals for
signs of scoring and wear.
2.Check bearing surfaces in cylinder head and
camshaft carrier for signs of scoring and wear.
CAUTION: Cylinder head and camshaft
carrier are machined together as an
assembly, if bearing surfaces in either
component are damaged, both components must
be replaced as an assembly.Camshaft - Check end-float
1.Position camshaft in camshaft carrier.
2.Check end-float of camshaft using a DTI.
Camshaft end-float =0.06 to 0.16 mm (0.002 to
0.006 in).
3.Renew components as necessary to achieve
correct end-float.
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ENGINE
13
OVERHAUL Camshaft bearings - check clearance
1.Position camshaft in cylinder head.
2.Place a piece of Plastigage along the centre line
of each camshaft bearing journal.
3.Carefully fit the camshaft carrier ensuring it is
located on dowels.
CAUTION: Do not rotate camshaft.
4.Fit original camshaft carrier retaining bolts and
tighten in sequence shown to25 Nm (18 lbf.ft).
5.Using sequence shown, loosen then remove
camshaft carrier retaining bolts.
CAUTION: Do not discard bolts at this
stage.
6.Carefully remove camshaft carrier.
7.Measure and record widest portion of Plastigage
on each camshaft bearing journal.
8.Compare figures obtained with camshaft bearing
clearance.
Camshaft bearing clearance =0.04 to 0.10
mm (0.002 to 0.004 in).
9.If any bearing clearance is found to exceed
figures given, repeat the above procedure using
a new camshaft.
CAUTION: If, after repeating the bearing
clearance check with a new camshaft the
bearing clearances are still excessive, a
new cylinder head and camshaft carrier assembly
must be fitted.
10.Remove all traces of Plastigage using an oily
cloth, do not use a scraper.
11.Discard camshaft carrier bolts.
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12ENGINE
14
OVERHAUL Valve springs - Inspection
1.Check free length of valve springs:
Free length =47.0±0.25 mm (1.85±0.011 in)
CAUTION: Valve springs must be replaced
as a set, if springs are to be refitted, keep
them in their fitted order.
Valves and valve guides - Inspection
1.Clean carbon from valves, check valves for
burning, pitting or cracking; replace as
necessary.
2.Clean carbon from valve seat inserts, remove all
loose particles on completion.
3.Check valve seat inserts for pitting and burning.
CAUTION: It is not permissible to recut or
replace valve seat inserts.
4.Remove carbon deposits from valve guides
using toolLRT-12-186.
CAUTION: Tool must be inserted from
combustion chamber face side of cylinder
head, ensure all loose particles of carbon
are removed on completion.
5.Check and record diameter of each valve stem.
Valve stem diameter:
Inlet = 6.907 to 6.923 mm (0.2719 to 0.2725 in)
Exhaust = 6.897 to 6.913 mm (0.2715 to 0.2721
in)
6.Renew any valve if stem diameter is less than
specified.7.Check and record valve stem to guide clearance
using the following procedures:
8.Insert each valve into its respective guide.
9.Extend valve head 10 mm (0.375 in) out of valve
seat and position a DTI gauge to rear of valve
head.
10.Move valve towards front of cylinder head and
zero DTI gauge ensuring that stylus of gauge
remains in contact with valve head.
11.Move valve towards rear of cylinder head, record
gauge reading to give valve stem to guide
clearance.
Valve stem to guide clearance:
Inlet valve = 0.025 to 0.059 mm (0.0009 to
0.0023 in)
Exhaust valve = 0.035 to 0.069 mm (0.0013 to
0.0027 in)
CAUTION: If stem to guide clearance
exceeds figures given and valve stem
diameters were as specified, cylinder head
assembly must be replaced; it is not possible to
replace valve guides.
12.Repeat above procedures for remaining valves.
CAUTION: Keep valves in their fitted order.
13.Check face angle of each valve, renew any
valve with incorrect face angles, do not attempt
to recut.
Valve face angle:
Inlet =29°48’±12’
Exhaust =44°48’±12’
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ENGINE
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OVERHAUL Valves - Lapping-in
1.Lap each valve to its seat using grinding paste.
2.Apply Prussian Blue to valve seat, insert valve
into guide and press it firmly, without rotating on
to seat.
3.Remove valve and check that a continuous,
even line of Prussian Blue has been transferred
on to valve face.
NOTE: Line does not have to be across
whole width of valve face.
4.Remove all traces of grinding paste on
completion.
5.Check valve head stand-down.See this
Section.
Valve head stand down
1.Insert each valve into its respective guide.
2.Using a straight edge and feeler gauges, check
and record stand down of each valve head.
3.Compare figures obtained with figures given
below.
Valve head stand down:
Inlet valveA= 0.555 to 0.825 mm (0.022 to
0.032 in)
Exhaust valveB= 0.545 to 1.35 mm (0.021 to
0.053 in)
CAUTION: If any valve has a stand down
greater than specified, repeat check using
a new valve. If, after checking with a new
valve, stand down is still excessive, cylinder head
assembly must be replaced. It is not possible to
replace valve seat inserts.Rocker shaft - Dismantling
1.Suitably identify each rocker arm to its fitted
position.
CAUTION: Identify type of rocker arm
fitted. Engine Serial No. Prefixes 10P to
14P - Type A rocker arms. Engine Serial
No. Prefixes 15P to 19P - Type B rocker arms.
Type B rocker arms and type B rocker shaft may
be fitted to Engine Serial No. Prefixes 10P to 14P
as an assembly.
2.Remove and discard spring ring retaining rocker
arm on shaft.
3.Remove rocker arm.
4.Remove and discard 2nd spring ring.
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