1995 LAND ROVER DISCOVERY engine oil

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 OPERATION5
CRANKSHAFT, SUMP AND OIL PUMP
1.Crankshaft
2.Woodruff key
3.Main bearing shell
4.Main bearing cap - front
5.Main bearing cap bolt
6.'O' ring - oil pick-up pipe
7.Oil pick-up pipe and strainer
8.Sump bolt
9.Oil drain pipe
10.Sump
11.Gasket - oil drain pipe
12.Main bearing cap - rear
13.Rear main bearing cap oil seal14.Crankshaft thrust washers
15.Main bearing cap - centre
16.Big-end bearing cap
17.Big-end bearing cap nut
18.Big-end bearing shell
19.Oil jet tube banjo bolt
20.Oil jet tube
21.Oil pump
22.Timing belt rear cover
23.Plug
24.Oil pressure relief valve spring
25.Oil pressure relief valve plunger

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 OPERATION11
TIMING BELT REAR COVER AND GEARS
1.Camshaft oil seal
2.Gasket
3.Crankshaft front oil seal
4.Timing belt rear cover
5.Injection pump drive gear
6.Hub plate
7.Nut - injection pump hub
8.Bolt - injection pump hub plate
9.Camshaft drive gear
10.Washer - camshaft drive gear11.Bolt - camshaft drive gear
12.Idler pulley
13.Retaining nut
14.Crankshaft gear
15.Bolt - timing belt tensioner pulley
16.Spacer - timing belt tensioner pulley bolt
17.Timing belt tensioner pulley and tensioner
bracket
18.Flanged spacer - idler pulley
19.'O' ring

ENGINE
DESCRIPTION AND OPERATION13
TIMING BELT AND FRONT COVER
1.Timing belt
2.Gasket
3.Access plate
4.Bolt - access plate
5.Timing belt front cover6.Bolts - timing belt front cover
7.Wading plug
8.Oil seal
9.Crankshaft pulley
10.Pulley bolt

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
18
DESCRIPTION AND OPERATION
Crankcase ventilation system
A breather cyclone unit (1), fitted to the right hand
side of the rocker cover controls the rate at which air
is purged from the sump, via a hose (2) from the
camshaft side cover to the rocker cover and extractsoil from the gaseous atmosphere. The oil then drains
back to the sump through a hose and flanged pipe
connection (3). The residues are drained-off from
the top of the cyclone breather and pass through a
hose (4) into the engine via the turbocharger where
they are burned in the combustion chamber.