Discovery II (LT) V8-4.0L (2002)
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Trilobular bolts (i.e. Powerlock) have a special thread form which creates a slight interference with the thread of the hole or nut into which it is screwed.
DO NOT re-use self-locking fasteners in critical locations (e.g. engine bearings, flywheel). Always use the correct replacement self-locking nut, bolt or
screw.
DO NOT fit non self-locking fasteners in applications where a self-locking nut, bolt or screw is specified.
Nut identification
A nut with an ISO metric thread is marked on one face or on one of the flats of the hexagon with the strength grade symbol 8,12, or 14. Some nuts with a
strength grade 4, 5 or 6 are also marked and some have the metric symbol M on the flat opposite the strength grade marking.
A clock face system is sometimes used as an alternative method of indicating the strength grade.
The external chamfers or a face of the nut is marked in a position relative to the appropriate hour mark on a clock face to indicate the strength grade.
A dot is used to locate the 12 o'clock position and a dash to indicate the strength grade. If the grade is above 12, two dots identify the 12 o'clock position.
When tightening a slotted or castellated nut, never loosen it to insert a split pin except where recommended as part of an adjustment. If difficulty is
experienced, alternative washers or nuts should be selected, or the washer thickness reduced.
Where bearing pre-load is involved, nuts should be tightened in accordance with special instructions.
Self-locking nuts
Self-locking nuts, i.e. nylon insert or deferred thread nuts can be re-used providing resistance can be felt when the locking portion of the nut passes over
the thread of the bolt or stud.
Where self-locking nuts have been removed, it is advisable to replace them with new ones of the same type.
Flexible Pipes and Hoses
General
When removing and installing flexible hydraulic pipes and hoses, ensure that the following practices are observed to ensure component serviceability.
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Before removing any brake or power steering hose, clean end fittings and area surrounding them as thoroughly as possible.
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Obtain appropriate plugs or caps before detaching hose end fittings, so that the ports can be immediately covered to prevent the ingress of dirt.
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Clean hose externally and blow through with airline. Examine carefully for cracks, separation of plies, security of end fittings and external damage.
Reject any faulty hoses.
