Pistons
- Make
- Land Rover
- Model
- Defender 90 Workshop Manual (NAS)
- Section
- Information › Pistons
General specification dataPistons
Pistons
Clearance in bore, measured at bottom
| of skirt at right angles to piston pin | 0,020-0,050 mm |
Piston rings
| Number of compression rings | 2 |
| Number of control rings | 1 |
| No 1 compression ring | Molybdenum barrel faced |
| No 2 compression ring | Tapered and marked ’T’ or ’TOP’ |
| Width of compression rings | 1,48-1.49 mm |
| Top | 1,21-1,23 mm |
| Compression ring gap | 0,40-0,65 mm |
| Top | 0.3-0.5 mm |
| Oil control ring type | Aclonoform |
| Oil control ring width | 3,0 mm |
| Oil control ring rail gap | 0,38-1,40 mm |
Camshaft
| Location | Central |
| Number of bearings | 5 |
| Bearing type | Tin-aluminium - Non serviceable |
| Camshaft end-float | 0. |
| Drive | Chain 9,52 mm pitch x 54 pitches. |
Tappets
| Type | Hydraulic-self-adjusting |
Valves
| Length: Inlet | 116,59-117,35 mm |
| Exhaust | 116,59-117,35 mm |
| Seat angle: Inlet | 45°to 45°25’ |
| Exhaust | 45°to 45°25’ |
| Head diameter: Inlet | 39,75-40,00 mm |
| Exhaust | 34,23-34,48 mm |
| Stem diameter: Inlet | 8,664-8,679 mm |
| Exhaust | 8,651-8,666 mm |
| Stem to guide clearance: Inlet | 0,025-0,066 mm |
| Exhaust | 0,038-0,078 mm |
| Valve lift (Inlet and Exhaust) | 9,94 mm |
| Valve spring fitted length at pressure of 29,5 kg, 65 lb | 40,4 mm |
Lubrication
| System type | Wet sump, pressure fed |
| Oil pump type | Eccentric rotor |
| Oil pressure at 2400 rev/min with engine | |
| at running temperature | 2.1 - 2.8 bar |
| Oil filter - internal | Wire screen, pump intake filter. |
| Oil filter - external | Full flow, self-contained cartridge |
0.0008-0.0020 in
0.058-0.059 in 0.047-0.048 in 0.016-0.26 in 0.012-0.020 in
0.118 in 0.015-0.055 in
4.590-4.620 in 4.590-4.62 in
1.565-1.575 in 1.347-1.357 in 0.341-0.342 in 0.340-0.341 in 0.001-.0026 in 0.0015-0.003 in 0.391 in 1.590 in
30 - 40 lb/in2
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