1995 LAND ROVER DISCOVERY compression ratio

01INTRODUCTION
14
INFORMATION LOCATION OF IDENTIFICATION NUMBERS
Engine serial number - 300Tdi Engine
The 300Tdi engine number is stamped on the cylinder
block on the right hand side of the engine above the
camshaft front cover plate.
Engine serial number - Mpi engine
Stamped on the R.H. face of the cylinder block
adjacent to the gearbox.
Engine serial number - V8i engine
Stamped on a cast pad on the cylinder block, between
numbers 3 and 5 cylinders.
NOTE: The appropriate engine
compression ratio is stamped above the
serial number.
Main gearbox R380
Stamped on a cast pad on the bottom right hand side
of the gearbox.
Transfer gearbox LT230
The serial number is stamped on the left hand side of
the gearbox casing below the mainshaft rear bearing
housing adjacent to the bottom cover.
Front and rear axles
Serial number is stamped on top of the left hand axle
tube.

GENERAL SPECIFICATION DATA
1
INFORMATION ENGINE 3.9 V8i
Type V8i.................................................................................
Number of cylinders Eight, two banks of four.........................................................
Bore 94,00 mm.................................................................................
Stroke 71,12 mm...............................................................................
Capacity 3950 cc...........................................................................
Compression ratio 8.13:1 or 9.35:1............................................................
Valve operation Overhead by push-rod................................................................
Maximum power - 8.13:1 127kW at 4550 rev/min............................
- 9.35:1 134kW at 4750 rev/min............................
Crankshaft
Main journal diameter 58,409-58,422 mm.......................................................
Minimum regrind diameter 57,393-57,406 mm...............................................
Crankpin journal diameter 50,800-50,812 mm................................................
Minimum regrind diameter 49,784-49,797 mm...............................................
Crankshaft end thrust/(end float) Taken on thrust washers of centre main bearing......................................
0,10-0,20 mm
Main bearings
Number and material 5, Lead-indium........................................................
Diametrical clearance 0,010-0,048 mm.......................................................
Undersize bearing shells 0,254 mm, 0,508 mm..................................................
Connecting rods
Type Horizontally split big-end, plain small-end.................................................................................
Length between centres 143,81-143,71 mm...................................................
Big-end bearings
Type and material Lead-indium............................................................
Diametrical clearance 0,015-0,055 mm.......................................................
End-float crankpin 0,15-0,36mm............................................................
Undersize bearing shells 0,254 mm, 0,508 mm..................................................
Piston pins
Length 72,67-72,79 mm..............................................................................
Diameter 22,215-22,220 mm..........................................................................
Fit-in connecting rod Press fit.........................................................
Clearance in piston 0,002-0,007 mm..........................................................

GENERAL SPECIFICATION DATA
3
INFORMATION ENGINE 4.0 V8
Type 4.0 litre V8.................................................................................
Number of cylinders Eight, two banks of four.........................................................
Bore 94.00 mm................................................................................. 3.70 in
Stroke 71.12 mm............................................................................... 2.80 in
Capacity 3950 cm
3........................................................................... 241 cu in
Valve operation Overhead by push-rod................................................................
High Compression Low Compression
Compression ratio 9.35:1............................................................ 8.2:1
Valve operation Overhead by push-rod................................................................
Maximum power: 9.35:1 140kW at 4750 rev/min..............................
8.2:1 132kW at 4750 rev/min................................
Crankshaft
Main journal diameter 63.500 - 63.487 mm....................................................... 2.50 - 2.4995 in
Crankpin journal diameter 55.513 - 55.500 mm................................................ 2.1855 - 2.1850 in
Crankshaft end thrust/end float Taken on thrust washers of centre main bearing........................................
0.10 - 0.20 mm 0.004 - 0.008 in
Main bearings
Number and type 5, Vandervell shells..............................................................
Material Lead bronze with lead-indium overlay............................................................................
Diametrical clearance 0.015 - 0.060 mm....................................................... 0.0006 - 0.0024 in
Connecting rods
Type Horizontally split big-end, plain small-end.................................................................................
Length between centres 155.12 - 155.22 mm................................................... 6.1071 - 6.1110 in
Big-end bearings
Type and material Vandervell VP3 Lead bronze with lead-indium overlay............................................................
Diametrical clearance 0.015 - 0.016 mm....................................................... 0.0006 - 0.0024 in
Piston pins
Length 60.00 - 60.50 mm.............................................................................. 2.3622 - 2.3819 in
Diameter 23.995 - 24.000 mm.......................................................................... 0.9447 - 0.9449 in
Fit-in connecting rod Press fit.........................................................
Clearance in piston 0.015 - 0.006 mm.......................................................... 0.0006 - 0.0002 in
Pistons
Clearance in bore, measured at bottom
of skirt at right angles to piston pin 0.020 - 0.050 mm................................... 0.0008 - 0.0020 in

04GENERAL SPECIFICATION DATA
18
INFORMATION 300 Tdi ENGINE
Type Direct injection, turbocharged, intercooled.................................................................................
Number of cylinders 4.........................................................
Bore 90,47 mm.................................................................................
Stroke 97,00 mm...............................................................................
Capacity 2495 cc...........................................................................
Compression ratio 19.5:1±0.5:1 ............................................................
Valve operation O.H.V. pushrod operated................................................................
Crankshaft
Main bearing journal diameter 63,475 - 63,487 mm..........................................
Regrind dimensions 63,2333 - 63,246 mm.........................................................
Use 0.010 in U/S bearings
Crankpin journal diameter 58,725 - 58,744 mm................................................
Regrind dimensions 58,4708 - 58,48985 mm.........................................................
Use 0.010 in U/S bearings
Crankshaft end thrust Taken on thrust washers at centre main bearing.......................................................
Crankshaft end float 0,05 - 0,15 mm.........................................................
Main bearings
Number and type 5 halved shells with oil grooves..............................................................
Diametrical clearance 0,0792 - 0,0307 mm.......................................................
Connecting rods
Length between centres 175,38 - 175,43 mm...................................................
Diametrical clearance (big-end bearings) 0,025 - 0,075 mm........................
End float on crankpin 0,15 - 0,356 mm.......................................................
Pistons
Type Aluminium alloy, combustion chamber in crown..................................................................................
Graphite coating on sidewalls.
Skirt diametrical clearance
(at right angle to gudgeon pin) 0,025 - 0,05 mm.........................................
Maximum height above combustion face 0,8 mm.........................
Gudgeon pins
Type Floating.................................................................................
Fit in piston Hand push fit.......................................................................
Diameter 30,1564 - 30,1625 mm..........................................................................
Clearance in connecting rod 0,0025 - 0,0163 mm............................................

04GENERAL SPECIFICATION DATA
22
INFORMATION ENGINE - Mpi - 2.0 LITRE
Type 20 T4 - 16 valve twin overhead camshaft.................................................................................
Cylinder arrangement 4 in line.......................................................
Bore 84.45 mm.................................................................................
3.325 in
Stroke 89.00 mm...............................................................................
3.504 in
Capacity 1994 cm
3...........................................................................
121.68 in3
Firing order 1-3-4-2.......................................................................
Compression ratio 10 : 1............................................................
Oil pump
Outer rotor to body clearance 0.05 to 0.10 mm..........................................
Inner rotor tip clearance 0.025 to 0.12 mm...................................................
Outer rotor end float 0.03 to 0.08 mm.........................................................
Oil pressure relief valve
Spring free length 42.0 mm.............................................................
Cooling system
Starts to open 82 to 86°C ...................................................................
Thermostat fully open 88°C .......................................................
Open travel A 9 mm...................................................................
Camshaft
Camshaft end-float 0.06 to 0.25 mm...........................................................
Bearing clearance 0.060 to 0.094 mm............................................................
Service limit 0.15 mm.............................................................
Timing belt tensioner
Spring free length 57.5 to 58.5 mm.............................................................
Cylinder head
Longitudinal warp - maximum 0.1 mm.................................
Transverse warp - maximum 0.1 mm...................................
Diagonal warp - maximum 0.1 mm......................................
Cylinder head height 135.0 to 135.1 mm...............................................
Valve springs
Free length 46.25 mm.......................................................................
Fitted length 37.0 mm.....................................................................
Load at fitted length 255±12 N ..........................................................
Load at valve open length 560±22.5 N ................................................

ENGINE TUNING DATA
1
INFORMATION ENGINE 3.9 V8i
Type3.9 Litre V8i .................................................................................
Firing order1-8-4-3-6-5-7-2 .....................................................................
Cylinder Numbers
Left bank 1-3-5-7..........................................................................
Right bank 2-4-6-8........................................................................
No 1 Cylinder locationPulley end of left bank ...................................................
Timing marksOn crankshaft vibration damper ..................................................................
Spark plugs
Make/type(8.13:1 Compression) Champion RN11YCC......................................
Gap 0.84-0.96mm..................................................................................
Make/type(9.35:1 Compression) Champion RN11YCC......................................
Gap 0.84-0.96mm..................................................................................
Coil
Make/type Bosch 0-221-122-392,........................................................................
Compression ratio8.13:1 or 9.35:1 .........................................................
Fuel injection systemLucas 14 CUX Hot-wire air flow sensor system .....................................................
electronically controlled
Valve Timing Inlet Exhaust
Opens 32°BTDC .............................................................................. 70°BBDC
Closes 73°ABDC .............................................................................. 35°ATDC
Duration 285° ........................................................................... 285°
Valve peak 104°ATDC ....................................................................... 114°BTDC
Idle speed - controlled by MFI system
- all loads off in neutral 665 to 735 rev/min.....................................................
- auto gearbox in gear, air con operating 650±28 rev/min .........................
- auto gearbox in gear, air con off 600±28 rev/min ....................................
- manual gearbox 700±28 rev/min .............................................................
- manual gearbox, air con operating 750±28 rev/min ................................
Base idle speed525±25 rev/min
See FUEL SYSTEM, Fault..............................................................
diagnosis, Base idle speed setting.
Ignition Timing - dynamic at 800 rev/min max,
vacuum disconnected
8.13:1 compression, non catalyst 2°BTDC±1° .....................................
9.35:1 compression, non catalyst 4°BTDC±1° .....................................
9.35:1 compression, catalyst 5°BTDC±1° ............................................
Exhaust gas
CO content at idle 0.5 to 1.0% max.............................................................

05ENGINE TUNING DATA
2
INFORMATION Distributor
Make/type Lucas 35DLM8 electronic........................................................................
Rotation Clockwise............................................................................
Air gap 0.20-0.35mm..............................................................................
Part number Lucas Rover
8.13:1, non catalyst 42584A.......................................................... ERR 4753
9.35:1, non catalyst 42582A.......................................................... ERR 4754
9.35:1, catalyst 42583A................................................................. ERR 4755
Centrifugal Advance
Decelerating check-vacuum hose disconnected
Distributor rpm decelerating speeds
8.13:1 non catalyst
2000 Distributor advance................................................................................. 5°30' to 8°30'
1400 ................................................................................. 6°18' to 8°30'
800 ................................................................................... 2°to 4°
9.35:1 non catalyst
2200 Distributor advance................................................................................. 7°to 10°
1400 ................................................................................. 7°48' to 10°
650 ................................................................................... 1°to 3°
9.35:1 catalyst
2200 Distributor advance................................................................................. 5°30' to 8°30'
1400 ................................................................................. 6°18' to 8°30'
800 ................................................................................... 2°to 4°
Fuel
8.13:1, non catalyst 91 RON minimum unleaded..........................................................
9.35:1, non catalyst 95 RON minimum unleaded..........................................................
9.35:1, catalyst 95 RON minimum unleaded.................................................................
USA-Premium unleaded (PUG) CLC or AKI 90 octane minimum.......................................
95 RON minimum
Australian market variations
Fuel 91 RON minimum unleaded..................................................................................
Compression ratio 8.13:1............................................................
Spark plug Champion RN12YC........................................................................
Spark plug gap 0.84-0.96mm (0.033-0.038 in).................................................................
Ignition Timing at 800 rev/min max
(vacuum pipe disconnected) 2°BTDC±1° ............................................
Exhaust gas idle CO 1% max (hot)........................................................

ENGINE TUNING DATA
3
INFORMATION ENGINE 4.0 V8
Type4.0 Litre V8 .................................................................................
Firing order1-8-4-3-6-5-7-2 .....................................................................
Cylinder Numbers
Left bank 1-3-5-7..........................................................................
Right bank 2-4-6-8........................................................................
No 1 Cylinder locationPulley end of left bank ...................................................
Spark plugs
Make/type Champion RN11YCC........................................................................
Gap 0.90 - 1.00 mm.................................................................................. 0.035 - 0.040 in
Coils
Make Lucas 2D1S2................................................................................
Type Twin coils, bank of 4.................................................................................
High Compression Low Compression
Compression ratio 9.35:1............................................................ 8.2:1
Fuel injection systemSagem - Lucas GEMS8 Hot-wire air flow sensor .....................................................
system electronically controlled
Valve Timing Inlet Exhaust
Opens 28°BTDC .............................................................................. 66°BBDC
Closes 77°ABDC .............................................................................. 39°ATDC
Duration 285° ........................................................................... 285°
Valve peak 108°ATDC ....................................................................... 110°BTDC
Idle speed - controlled by GEMS system
all loads off 700±20 rev/min ..............................................................
Base idle speedNot adjustable ..............................................................
Idle air control valve position, checked viaTestBook
CO at idle
vehicles without heated oxygen sensors 1.5% ñ 0.5%.................
Fuel
9.35:1 catalyst 95 RON minimum unleaded.................................................................
USA vehicles - Premium unleaded (PUG) 95 RON minimum.......................
8.2:1 catalyst 91 RON minimum unleaded.................................................................
Non catalyst 91 RON minimum unleaded or leaded.........................................................