1995 LAND ROVER DISCOVERY lock

ENGINE
DESCRIPTION AND OPERATION3
CYLINDER BLOCK, PISTONS AND CAMSHAFT
1.Top compression ring
2.2nd compression ring
3.Oil control ring
4.Piston
5.Gudgeon pin circlips
6.Gudgeon pin
7.Connecting rod
8.Brake servo vacuum pump gasket
9.Core plug
10.Connecting rod bolt
11.Big-end bearing shell
12.Push rod
13.Cam follower slide
14.Roller
15.Cam follower guide
16.Guide retaining bolt
17.Dipstick
18.Dipstick tube
19.Dipstick tube bolt20.Camshaft
21.Oil jet tube
22.Drive pin
23.Camshaft thrust plate
24.Camshaft bearings
25.Main bearing shell
26.Baffle plate
27.Core plugs
28.Oil pressure switch
29.Thermostatic valve assembly
30.Oil filter head
31.Fuel lift pump
32.Fuel lift pump gaskets
33.Spacer - if fitted
34.Brake servo vacuum pump
35.Crankcase breather pipe
36.Oil filter head gasket
37.Baffle plate gasket
38.Oil filter element

ENGINE
DESCRIPTION AND OPERATION7
ROCKER SHAFT AND COVER
1.Rocker cover flange nuts
2.Sealing washer
3.Oil filler cap
4.Rocker cover
5.Rocker cover gasket
6.Rocker shaft
7.Rocker shaft pedestal
8.Flange bolt
9.Washer10.Rocker arm bush
11.Adjusting screw
12.Locknut
13.Rocker arm
14.Spacer
15.Pedestal stud
16.Nut
17.Crankcase breather cyclone unit
18.'O' ring

ENGINE
DESCRIPTION AND OPERATION15
OPERATION
The 300 TDi is a 4 cylinder, water cooled,
turbocharged diesel engine with a capacity of 2.5
litres.
The cast iron cylinder block is integral with the
crankcase and incorporates direct bored cylinders.
The crankshaft is carried in 5 main bearings,
end-float being controlled by thrust washers which
are positioned on both sides of the centre main
bearing.
The flywheel/drive plate housing is an aluminium
alloy casting secured to the rear of the cylinder
block, it also forms the mounting for the starter
motor. A plugged aperture in the housing allows
access for the insertion of the timing pin.
The aluminium alloy cylinder head carries a
conventional rocker shaft and rockers, operating 2
valves per cylinder via camshaft followers and push
rods from a single camshaft, supported in the
cylinder block by 4 bearings and driven by a gear
and toothed belt from the crankshaft. A lobe formed
between the 2 inner bearing journals provides drive
for the fuel lift pump and another lobe, between the 2
drive end journals provides drive for the brake servo
pump. Camshaft end-float is controlled by a thrust
plate bolted to the cylinder block.
Graphite coated, aluminium alloy pistons are fitted
with 2 compression and an oil control ring and are
secured to the connecting rods by semi-floating
gudgeon pins which are an interference fit in the
small end bush. A swirl chamber is incorporated in
the piston crown to facilitate combustion.
The timing case consists of cast aluminium alloy
front and rear covers which house the oil pump,
crankshaft and camshaft front oil seals and which
also carry the fuel injection pump and drive belt idler
pulley. Housed within the timing case housing is the
crankshaft gear which provides drive for the
camshaft and fuel injection pump gears via a rubber
toothed belt.

ENGINE
DESCRIPTION AND OPERATION17
Lubrication
The engine lubrication system is of the wet sump
type, oil pressure being provided by the rotor type oil
pump (1) driven directly by the crankshaft.
Oil is drawn from the sump (2) through the strainer
(3), suction pipe (4) and passes through internal
drillings in the cylinder block to an external, full flow
filter (5). Further drillings feed oil to the cylinder
block main oil gallery (6) which, in turn, supplies the
crankshaft main bearings (7). Cross drillings in the
crankshaft carry oil to the connecting rod big-end
bearings (8). The camshaft bearings (9) are supplied
with oil from the main oil gallery.
An internal oilway from the camshaft front bearing
connects the cylinder block to the cylinder head and
feeds oil to the rocker shaft assembly (10),
lubricating the valves and springs.
The pistons, gudgeon pins and small end bushes
are lubricated and cooled by oil jets (11) which are
supplied from the main oil gallery via relief valves
which allow the oil to flow at a pre-determined
pressure.
Oil pressure is controlled by a pressure relief valve
(12) incorporated in the timing case housing
together with the oil pump. The valve allows excess
oil to be recirculated back into the oil feed gallery.
The rotor type oil pump is driven by 2 flats machined
on the front of the crankshaft.
Oil cooling is maintained by an oil cooler which is
integral with the radiator and linked to adaptors on
the oil filter head by pre-formed feed and return
hoses. A thermostatic valve in the filter head allows
oil to flow to the cooler when it reaches a
pre-determined temperature.

ENGINE
2
OVERHAUL
6.Remove timing belt front cover.
7.Remove and discard gasket.
8.Remove and discard crankshaft front oil seal
from timing belt front cover.
9.Temporarily fit crankshaft pulley bolt to
crankshaft.
Manual gearbox
10.Remove plug from bottom of flywheel housing.
11.Rotate crankshaft clockwise using crankshaft
pulley bolt until toolLRT-12-044can be
located in slot in flywheel.
CAUTION: Do not rotate crankshaft
anti-clockwise and do not use camshaft or
fuel injection pump gear bolts to rotate
crankshaft.
Automatic gearbox
12.Rotate crankshaft clockwise using crankshaft
pulley bolt until toolLRT-12-044can be
inserted through hole in engine plate and into
slot in drive plate.
CAUTION: Do not rotate crankshaft
anti-clockwise and do not use camshaft or
fuel injection pump gear bolts to rotate
crankshaft.

ENGINE
OVERHAUL7
8.Position flanged spacer on idler pulley stud.
9.Fit timing belt tensioner pulley and bracket
ensuring that hole in tensioner bracket is
located on flanged spacer.
10.Fit slotted washer with the slot vertical and fit
bolt, finger tight.
11.Temporarily fit crankshaft pulley bolt to
crankshaft.
NOTE: Flywheel illustrated
12.
Manual gearbox:Rotate crankshaft clockwise
using crankshaft pulley bolt until tool
LRT-12-044can be inserted in slot in flywheel.
13.
Automatic gearbox:Rotate crankshaft
clockwise using crankshaft pulley bolt until tool
LRT-12-044can be inserted in slot in drive
plate.
14.Check that crankshaft Woodruff key is aligned
with arrow on timing belt rear cover.
15.If necessary, rotate camshaft timing gear using
the centre bolt until timing mark on gear is
aligned with timing mark on timing belt rear
cover.
16.Remove crankshaft pulley bolt.

ENGINE
8
OVERHAUL Timing belt - refit and adjust tension
Refit
1.Using the fingers only, fit a new timing belt to
timing gears keeping slack portion of belt on
idler pulley side of belt. If necessary, rotate fuel
injection pump gear anti-clockwise to align
gear teeth with those of timing belt.
CAUTION: If original timing belt is to be
refitted, ensure direction of rotation mark
is facing correct way.
2.Fit idler pulley.
3.Fit idler pulley nut and tighten to 45 Nm.
4.Ensure that timing belt is correctly located on
timing gears.
5.Check that tensioner pulley bolt is finger tight.
6.Temporarily fit crankshaft pulley bolt to
crankshaft.Adjust tension
1.Ensure toolsLRT-12-044andLRT-12-045
are still fitted.2.Position a dial type torque wrench and suitable
extension to hole in tensioner bracket keeping
the torque wrench positioned vertically.
3.Tension timing belt to :
Used belt - 12 Nm
New belt - 15 Nm
4.Keeping timing belt at the correct tension,
tighten tensioner bolt to 45 Nm.

ENGINE
OVERHAUL9
5.Check that timing pinLRT-12-045moves
freely in and out of injection pump hub, if pin
does not move freely, slacken 3 bolts, move
gear slightly and re-check.
6.When timing pin moves freely, tighten 3 bolts
to 25 Nm.
7.Remove timing pinLRT-12-045and
flywheel/drive plate locking toolLRT-12-044.
8.Rotate crankshaft twice in a clockwise direction
using crankshaft pulley bolt until flywheel/drive
plate locking toolLRT-12-044can be refitted.
9.Slacken timing belt tensioner securing bolt and
re-tension timing belt.
10.Tighten tensioner bolt to 45 Nm.
11.Fit timing pinLRT-12-045into fuel injection
pump gear hub plate and pump hub. If timing
pin cannot be inserted, slacken injection pump
gear bolts, rotate pump shaft using shaft nut
until pin slides easily into pump hub, Tighten
bolts to 25 Nm.
12.Tighten camshaft gear bolt to 80 Nm.
13.Remove timing pin and flywheel/drive plate
locking tools.
14.Fit plug to flywheel housing, tighten to 12 Nm.
15.Remove crankshaft pulley bolt.
16.Support timing belt front cover on suitable
blocks of wood.
17.Smear a new crankshaft oil seal with engine
oil.
18.Using toolLRT-12-077,fit oil seal from inside
face of front cover.
19.Fit a dry, new gasket to timing belt rear cover.
20.Position timing belt front cover to rear cover.
21.Fit bolts of the correct length in positions
shown.