1995 LAND ROVER DISCOVERY engine

ENGINE
OVERHAUL13
Inspecting components
1.Measure and record diameter of rocker shaft at
one of the pedestal locations.
2.Measure and record diameter of rocker shaft at
each of the rocker arm locations.
3.Compare measurements obtained and
calculate difference between diameters. If wear
at any rocker shaft location exceeds 0.025 mm,
a new rocker shaft must be fitted.
4.Check rocker arm pads for signs of wear,
replace rocker arms as necessary.
5.Check threads and ball ends of each tappet
adjusting screw for wear. Pay particular
attention to ball ends, replace any showing
signs of flattening on the ball or damage to
threads.
6.Check that each nut runs freely on adjusting
screw threads.
7.Check each push rod for signs of wear and for
straightness, replace as necessary.
8.Check valve caps for signs of wear, replace as
necessary.
9.Check rocker arm bushes for scoring and
wear.
10.Assemble each rocker arm to its fitted location
on rocker shaft and check clearance of bush to
shaft does not exceed 0.12 mm.
11.If clearance exceeds figure given, bushes must
be replaced.Rocker arm bushes - replace
1.Support rocker arm on bed of hand press.
2.Using a suitable piloted mandrel, press bush
out of rocker arm.
3.Lubricate replacement bush with engine oil and
press into rocker arm ensuring that lubrication
holes in bush and arm are aligned.
4.Check that lubrication holes in each rocker arm
are clear.
5.Check that lubrication holes in rocker shaft are
clear.
6.Check spacers and washers for wear, replace
as necessary.

ENGINE
14
OVERHAUL Rocker shaft - assembling
1.Lubricate all components with engine oil.
2.Assemble rocker arms, spacers, washers and
pedestals to rocker shaft ensuring that they are
in their original fitted positions.
3.Retain pedestals 1 and 5 with slave bolts.Rocker shaft - refit
1.Lubricate push rods with engine oil and fit to
their original positions. Ensure that ball end of
each push rod is correctly located in each cam
follower slide.
2.Screw each tappet adjusting screw into its
respective rocker arm until ball end is flush with
underside of arm; fit but do not tighten
locknuts.
3.Lubricate valve pads with engine oil and fit to
their original positions.
4.Position rocker shaft to cylinder head, fit but do
not tighten 3 nuts.
5.Remove slave bolts from pedestals 1 and 5, fit
but do not tighten 2 bolts.
6.Locate each push rod in turn beneath its
respective tappet adjusting screw and tighten
each screw until ball end locates in recess in
push rod.
7.Working from the centre outwards,
progressively tighten 3 nuts and 2 bolts to 5
Nm.

ENGINE
OVERHAUL15
8.Make a suitable pointer from welding rod and
position it to number 1 pedestal stud.
9.Temporarily fit a nut to secure pointer to stud.
10.Assemble degree plateLRT-12-007to a
suitable torque wrench or extension bar.
11.Tighten the centre pedestal nut a further 50°.
12.Tighten 2 pedestal bolts and number 5
pedestal nut a further 50°.
13.Remove pointer and secure it to number 5
pedestal stud.
14.Tighten number 1 pedestal nut a further 50°.
15.Remove pointer.
16.Adjust valve clearances.
17.Thoroughly clean mating faces of rocker cover
and cylinder head, remove all traces of gasket
material using gasket removal spray and a
plastic scraper.

ENGINE
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OVERHAUL
18.Check sealing washers for damage or
distortion, replace as necessary.
19.Position a new gasket - dry to rocker cover.
20.Position rocker cover to cylinder head, fit 3
flange nuts and working from centre outwards,
tighten to 10 Nm.
21.Lubricate a new 'O' ring with engine oil and fit
to crankcase breather cyclone unit.
22.Fit cyclone unit to rocker cover, fit bolt and
tighten to 9 Nm.
23.Connect breather hoses to cyclone unit, rocker
cover and cylinder block.

ENGINE
OVERHAUL17
VALVE CLEARANCES - ADJUST
CAUTION: To prevent possibility of
damage to cam follower seatings, it is
essential that ball ends of tappet adjusting
screws are seated in recess in push rods and
that ball end of each push rod is correctly
located in cam follower slide.
1.Rotate crankshaft by means of crankshaft
pulley bolt in a clockwise direction until number
8 valve ( counting from front of engine ) is fully
open.
2.Using feeler gauges and a screwdriver, adjust
clearance of number 1 valve.
Valve clearance - all valves = 0.20 mm
3.Tighten tappet adjusting screw locknut when
clearance is correct.
4.Adjust the remaining valve clearances in the
following sequence:
Adjust number 3 clearance with number 6
valve fully open
Adjust number 5 clearance with number 4
valve fully open
Adjust number 2 clearance with number 7
valve fully open
Adjust number 8 clearance with number 1
valve fully open
Adjust number 6 clearance with number 3
valve fully open
Adjust number 4 clearance with number 5
valve fully open
Adjust number 7 clearance with number 2
valve fully open
5.Upon completion, re-check all clearances and
adjust as necessary.

ENGINE
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OVERHAUL CYLINDER HEAD
Remove
1.Remove rocker shaft.
2.Remove fuel injectors.
3.Remove glow plugs.
4.Using sequence shown, progressively slacken
then remove and discard 18 bolts securing
cylinder head.
5.Using assistance, remove cylinder head.
NOTE: Dowel located.
6.Remove cylinder head gasket.
CAUTION: Identify cylinder head gasket
thickness by the number of holes in the
edge of the gasket between numbers 3
and 4 injector ports. Replacement gasket must
be of the same thickness as the original unless a
replacement cylinder head, crankshaft and/or
pistons are fitted.
- See Cylinder head gasket
selection.
7.Discard cylinder head gasket.
8.Remove 2 bolts securing coolant outlet elbow.
9.Remove coolant outlet elbow.
10.Remove thermostat from housing.
11.Remove 4 bolts securing thermostat housing to
cylinder head, remove housing.
12.Remove and discard gasket.
13.Remove all traces of gasket using suitable
gasket removal spray and a plastic scraper.

ENGINE
OVERHAUL19
14.Remove 2 bolts securing engine front lifting
bracket, remove bracket.Valves and springs - remove
1.Support cylinder head clear of valves, use a
hollow drift and tap each valve spring cap to
free collets.
2.Position cylinder head on its side.
3.Using toolLRT-12-034compress valve spring.
4.Remove 2 collets from valve stem.
5.Remove toolLRT-12-034.

ENGINE
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6.Remove spring cup, valve spring and spring
seat. Keep components in their fitted order.
7.Remove and discard valve stem oil seal.
8.Remove valve, and retain in fitted order.
9.Repeat above procedures for remaining
valves.Cylinder head - inspection
1.Decarbonise cylinder head.
2.Examine cylinder head for cracks, pay
particular attention to area between inlet and
exhaust valve seats. Cracks indicate engine
has overheated and cylinder head must be
replaced.
3.Check core plugs for signs of corrosion and
leakage, replace as necessary.4.Check cylinder head for warping using a
straight edge and feeler gauges.
Maximum warping = 0.08 mm
CAUTION: Cylinder head must not be
refaced, if warping exceeds figure given,
head must be replaced.
5.Check valve seat inserts for burning, pitting or
damage, replace inserts if pitting cannot be
removed by valve lapping-in or refacing.