300 Tdi engine (Discovery 1)

Type - diesel with direct injection, turbocharging and intermediate air cooling

Number of cylinders - 4

Cylinder diameter: 90.47 mm

Piston stroke: 97.00 mm

Working volume - 2495 cm³

Compression ratio: 19.5:1±0.5:1

Valve drive - pushrod

Crankshaft

Main journal diameter: 63.475-63.487 mm

Repair size - 63.2333-63.246 mm

install a repair insert - 0.025 mm

Crankpin diameter: 58.725-58.744 mm

Repair size - 58.4708-58.48985 mm

install a repair insert - 0.025 mm

Axial stop - thrust bearing on the central journal

Axial clearance: 0.05-0.15 mm

Main bearings

• Quantity and type - 5, bearings with lubrication grooves
• Bearing clearance: 0.0792-0.0307 mm

Connecting rods

• Connecting rod length (between the axes of the heads) — 175.38-175.43 mm
• Bearing clearance: 0.025-0.075 mm
• The clearance between the connecting rod and the shaft cheek is 0.15-0.356 mm

Pistons

• Type - aluminum alloy, combustion chamber in a piston with a graphite-coated skirt.
• Cylinder clearance: 0.025-0.05 mm (measure along the skirt perpendicular to the axis of the piston pin)
• Piston clearance at TDC - 0.8 mm

Piston pins

• Type - floating
• Installation - by hand
• Diameter - 30.1564-30.1625 mm
• Connecting rod clearance: 0.0025-0.0163 mm

Piston rings

Type:

• the top one is barrel-shaped, chrome-plated
• the second is conical (minute)
• oil scraper - composite with expander

Gap in the lock:

• upper - 0.40-0.60 mm
• second - 0.30-0.50 mm
• oil scraper - 0.3-0.6 mm

Piston groove clearance:

• second - 0.050-0.085 mm
• oil scraper - 0.050-0.085 mm

Camshaft

• Drive - toothed belt 30 mm wide
• Location: in the block on the right
• Axial clearance: 0.1-0.2 mm
• Number of bearings - 4
• Material: steel with chilled cast iron coating

Valves

Valve clearance: inlet and outlet - 0.20 mm

Locking chamfer angle:

• inlet - 30°
• release - 45°

Plate diameter:

• inlet - 38.75-39.05 mm
• release - 36.35 - 6.65 mm

Rod diameter:

• intake - 7.960-7.975 mm
• release - 7.940-7.960 mm

Valve lift:

• inlet - 9.67 mm
• release - 9.97 mm

Cam lift:

• inlet - 6.81 mm
• release - 7.06 mm

Valve plate sinking

• inlet - 0.81-1.09 mm
• release - 0.86-1.14 mm

Valve springs

• Type - single spiral
• Free length - 46.28 mm
• Length under load 21 kg - 40.30

Lubrication

Type - with a "wet" tray, under pressure

Oil pressure on a warm engine from - 1.76 to 3.87 kg/cm²

Oil pump:

• type - rotary in the front cover,
• drive - from the nose of the crankshaft

Non-adjustable pressure reducing valve

Pressure reducing valve spring:

• total length - 51.6 mm
• under load - 7.71 kg 31 mm

Oil filter - replaceable element

Oil cooler - built into the radiator of the cooling system