1995 LAND ROVER DISCOVERY oil pressure

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 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
OVERHAUL31
TIMING BELT REAR COVER AND OIL PUMP
Timing belt rear cover - remove
1.Remove timing belt, tensioner and gears.
2.Remove fuel injection pump.
3.Remove sump and oil pick-up pipe.
4.Using sequence shown, progressively slacken
then remove bolts securing timing belt rear
cover; remove cover.
5.Remove and discard gasket.
6.Remove and discard camshaft and crankshaft
front oil seals.Oil pump and oil pressure relief valve - remove
Oil pump
1.Make suitable alignment marks between oil
pump and timing belt rear cover.
2.Progressively slacken then remove 7 screws
securing oil pump cover.
3.Remove oil pump cover.
4.Make suitable alignment marks between oil
pump inner and outer rotors and outer rotor
and timing belt rear cover.

ENGINE
32
OVERHAUL Oil pressure relief valve
1.Remove plug retaining oil pressure relief valve.
2.Withdraw spring and plunger.Inspecting components
1.Check rotor clearances.
A- Outer rotor to housing = 0.025 to 0.075 mm
B- Inner rotor to outer rotor = 0.025 to 0.075
mm
C- Rotor end-float = 0.026 to 0.135 mm
2.Remove inner and outer rotors.
3.Check rotors for damage, wear and scoring.
4.Check oil pump cover for wear and scoring.
5.Check oil pressure relief valve spring free
length is 68.0 mm.
6.Check plunger and relief valve bore for wear
and scoring.
7.Clean all traces of sealant from oil pump cover
using solvent from kit GUG 705548GM.
8.Remove all traces of sealant from relief valve
plug threads in oil pump body.
CAUTION: Do not use a tap.

ENGINE
OVERHAUL33
Oil pump and oil pressure relief valve - refit
Oil pump
1.Thoroughly clean timing belt rear cover,
remove all traces of gasket using suitable
gasket removal spray and a plastic scraper.
Remove all traces of sealant using solvent
from kit GUG 705548GM.
2.Ensure oil pump cover screw holes are clean
and dry.
3.Clean oil pump rotors and recess, lubricate
rotors and recess with engine oil.
CAUTION: Ensure alignment marks made
during dismantling are not erased.
4.Position inner and outer rotors in housing
ensuring that reference marks are aligned.
5.Apply bead of sealant from kit to outer edge of
oil pump cover, fit cover to housing ensuring
that reference marks are aligned.
6.Fit oil pump cover, fit and progressively tighten
7 screws.
7.Check that pump rotates freely.Oil pressure relief valve
1.Thoroughly clean oil pressure relief valve
plunger, spring and relief valve bore then
lubricate components with engine oil.
2.Insert plunger and spring into bore.
3.Smear threads of relief valve plug with Loctite
577.
4.Fit plug and tighten to 17 Nm.

ENGINE
OVERHAUL71
6.Check ring to groove clearances:
Top compression = 0.167 to 0.232 mm
2nd compression = 0.05 to 0.08 mm
Oil control rails = 0.05 to 0.08 mm
7.If new ring to groove clearances are excessive,
new pistons must be fitted.Oil jet tubes - inspection
1.Check that oil passage in each oil jet tube is
clear.
2.Thoroughly clean banjo bolts.
3.Insert a piece of stiff wire in end of banjo bolt
and check that non-return valve can be
depressed to open position and returns to
closed position under spring pressure.
CAUTION: If non-return valve is not
working correctly, replace banjo bolt.
4.Check sealing washers for damage, replace as
necessary.

ENGINE
74
OVERHAUL
11.Remove 2 bolts securing camshaft thrust plate
to cylinder block, remove and discard plate.
12.Carefully withdraw camshaft taking care not to
drop end of camshaft on to bearings.Camshaft, bearings and cam followers -
inspection
1.Check camshaft cams and bearing journals for
overheating, wear and scoring, replace
camshaft if necessary.
2.If camshaft is replaced, new bearings must be
fitted.
3.Check timing gear drive pin for security.
4.Check camshaft bearings for overheating, wear
and scoring and that lubrication holes are
clear, replace as necessary. Bearings must be
replaced as a set.
5.Check cam follower slides, rollers and cam
follower guides for signs of wear.
6.Check that each slide moves freely in its guide
and that oilways are clear. Cam followers must
be replaced as an assembly.
7.Check that oil passage in oil jet tube is clear.
8.Insert a piece of stiff wire in end of oil jet tube
and check that non-return valve can be
depressed and closes under spring pressure.

ENGINE
DATA, TORQUE & TOOLS3
TORQUE FIGURES
Timing belt tensioner bolt 45 Nm.....................
Timing belt idler pulley nut 45 Nm.....................
Flywheel/drive plate housing plug 12 Nm...............
Timing belt front cover bolts 25 Nm....................
Crankshaft pulley bolt 80 Nm then further 90° ........................
Rocker shaft nuts and bolts 5 Nm then further 50° ....................
Rocker cover nuts 10 Nm...........................
Crankcase breather cyclone unit bolt 9 Nm............
Rear timing cover bolts 25 Nm.......................
Oil pressure relief valve plug 17 Nm...................
Flywheel bolts 146 Nm..............................
Drive plate bolts 146 Nm.............................
Drive plate to starter ring gear bolts 25 Nm..............
Flywheel/drive plate housing bolts 45 Nm...............
Coolant outlet elbow bolts 9 Nm.....................
Thermostat housing bolts 25 Nm.....................
Oil filter head bolts 45 Nm...........................
Cylinder head bolts:
Stage 1 40 Nm...................................
Stage 2 Further 60° ...................................
Stage 3 Further 60° ...................................
Stage 4 - Bolts 1, 2, 7, 8, 9, 10, 15, 16, 17 and 18
onlyFurther 20°
......................................
Sump drain plug 35 Nm............................
Oil sump bolts 25 Nm..............................
Oil pick-up pipe bolts:
To main bearing cap 9 Nm.........................
To timing belt rear cover 25 Nm......................
Oil drain pipe bolts 25 Nm...........................
Fuel pump timing gear to hub plate bolts 25 Nm..........
Injector clamp nut 25 Nm...........................
Spill return pipe banjo bolts 10 Nm....................
Glow plugs 20 Nm.................................
Brake servo vacuum pump bolts 25 Nm................
Camshaft gear bolt 80 Nm..........................
Spill return pipe to injection pump banjo bolts 25 Nm......
Mounting bracket to fuel injection pump bolts 25 Nm......
Fuel injection pump and baffle plate to cylinder
block bolts25 Nm
.................................
Crankshaft rear oil seal housing bolts 25 Nm............
Camshaft thrust plate bolts 9 Nm....................
Camshaft oil jet tube 17 Nm.........................
Piston oil jet banjo bolts 17 Nm.......................
Cam follower guide bolts 14 Nm......................
Big-end bearing cap nuts 59 Nm......................
Main bearing cap bolts 133 Nm.......................