3.9 V8i engine (Discovery 1)

Type - V8i

Number of cylinders: eight, four per half-block

Cylinder diameter: 94.00 mm

Piston stroke: 71.12 mm

Working volume - 3950 cm³

Compression ratio: 8.13:1 or 9.35:1

Valve drive - pushrod from pushrod

Maximum power

• 8.13:1 - 127 kW at 4550 rpm
• 9.35:1 – 134 kW at 4750 rpm

Crankshaft

• Main journal diameter: 58.409-58.422 mm
• Minimum allowable: 57.393-57.406 mm
• Crankpin diameter: 50.800-50.812 mm
• Minimum allowable: 49.784-49.797 mm
• Axial clearance: 0.10-0.20 mm (measure by thrust bearing)

Main bearings

• Quantity and material - 5, lead-indium
• Gap: 0.010-0.048 mm
• Repair size - 0.254 mm, 0.508 mm

Connecting rods

• Type - with a connector on the bottom head
• Connecting rod length (between the axes of the heads) — 143.81-143.71 mm

Connecting rod bearing

• Material - lead-indium
• Bearing clearance: 0.015-0.055 mm
• The clearance between the connecting rod and the cheek is 0.15-0.36 mm
• Repair size - 0.254 mm, 0.508 mm

Piston pins

• Length: 72.67-72.79 mm
• Diameter - 22.215-22.220 mm
• Fixation - press fit in the upper head of the connecting rod
• Gap: 0.002-0.007 mm

Pistons

Cylinder clearance (measure along the edge of the skirt perpendicular to the axis of the piston pin) — 0.018-0.041 mm

Piston rings

Number of rings:

• compression - 2
• oil scraper - 1

1st compression ring - barrel-shaped with molybdenum coating

2nd compression ring - conical (minute) with T or TOP mark



Thickness of compression rings: 1.478-1.49 mm

The gap in the lock is 0.40-0.65 mm

Oil scraper ring thickness: 3.0 mm

The gap in the oil scraper ring lock is 0.38-1.40 mm

Camshaft

• Location: in the block, centered
• Bearings - tin-aluminum
• Number of bearings - 5
• Drive - chain (54 links, pitch 9.52 mm)
• Valve tappets - with hydraulic clearance compensation

Valves

Length:

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

Seat locking chamfer angle:

• Inlet - 45°-45.5°
• Release - 45°-45.5°

Valve disc diameter:

• Inlet - 39.75-40.00 mm
• Release - 34.226-34.480 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) — 9.49 mm

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

Lubrication

• System type: wet sump, pressurized
• Oil pump type - internal gear
• Oil pressure - 2.75 bar at 2500 rpm on a warm engine
• Internal oil filter - mesh on the oil intake.
• External oil filter - full-flow with replaceable element