4.0 V8 engine (Discovery 1)

Type - V8, 4 liters

Number of cylinders: eight, four per half-block

Cylinder diameter: 94.00 mm

Piston stroke: 71.12 mm

Working volume - 3950 cm³

Valve drive - pushrod, high compression ratio, low compression ratio

Compression ratio: 9.35:1 8.2:1

Maximum power:

• 9.35:1 - 140 kW at 4750 rpm
• 8.2:1 - 132 kW at 4750 rpm

Crankshaft

• Main journal diameter: 63.500-63.487 mm
• Crankpin diameter: 55.513-55.500 mm
• Axial clearance (by thrust bearing) — 0.10-0.20 mm

Main bearings

• Number and type - 5 inserts, Vandervell
• Material: lead bronze with lead-indium coating
• Bearing clearance: 0.015-0.060 mm
• Connecting rods - Horizontal split type
• Connecting rod length (between the axes of the heads) — 155.12-155.22 mm

Connecting rod bearings

• Type and material - Vandervell VP3, lead bronze with lead-indium coating
• Bearing clearance: 0.015-0.016 mm

Piston pins

• Length: 60.00-60.50 mm
• Diameter - 23.995-24.000 mm
• Fixation - press fit in the connecting rod
• Piston clearance: 0.015-0.006 mm

Pistons

Cylinder clearance: 0.020-0.050 mm (measure along the end of the skirt perpendicular to the axis of the piston pin)

Piston rings

Number of compression rings - 2

Oil scraper ring - 1

1st compression ring - barrel-shaped with nitride steel coating

2nd compression ring - conical (minute) with the TOR mark

Thickness of compression rings: 1.478-1.49 mm

top - 1.21-1.23 mm



The gap in the lock is 0.40-0.65 mm

top - 0.3-0.5 mm

Oil scraper ring - Aclonoform

Oil scraper ring thickness: 3.0 mm

The gap in the lock is 0.38-1.40 mm

Camshaft

• Location: in the block, centered
• Bearings are maintenance-free
• Number of bearings - 5
• Drive - chain (54 links, pitch 9.52 mm)
• Axial clearance: 0.076-0.355 mm
• Pushers - with hydraulic clearance compensation

Valves

Length:

• Intake - 116.59-117.35 mm
• Release - 116.59-117.35 mm

Seat locking chamfer angle:

• Inlet - 46°-46°25'
• Release - 46°-46°25'

Plate diameter:

• Inlet - 39.75-40.00 mm
• Issue - 34.227-34.48 mm

Rod diameter:

• Intake - 8.664-8.679 mm
• Release - 8.651-8.666 mm

Guide clearance:

• Inlet - 0.025-0.066 mm
• Release - 0.038-0.078 mm

Valve lift height (inlet and outlet) — 9.94 mm

(Details can be found on the website: lrman.ru)

The installed length of the valve spring is 40.4 mm with a force of 29.5 kg

Lubrication

• System type: wet sump, pressurized
• Oil pump type - gear with internal gearing
• Oil pressure - from 2.11 to 2.81 kg/cm² at 2400 rpm on a warm engine
• Internal oil filter - mesh on the oil intake
• External oil filter - full-flow with replaceable element