Designations of bolts and nuts (Range Rover 3)

Bolt Designations

Most of the nuts and bolts used on the New Range Rover are replaceable once they have been loosened or removed. Detailed information is provided in the relevant sections of this Manual.

CAUTION: All rear suspension mounting threads must be replaced with new ones after being loosened.

All bolts or screws with metric ISO threads made of steel and with an outside diameter greater than 6 mm have the ISO M or M designation stamped on the bolt head.

In addition to the manufacturer's designation, the bolt head also has a strength index designation, for example: 8.8; 10.9; 12.9; 14.9. Some bolts have the designation M and strength index stamped on the hexagon faces.

Bolts protected with anaerobic sealant

Anaerobic sealant is applied to the threads of a bolt or screw in a special way during manufacturing. These bolts can be identified by a colored strip that continues 360 degrees around the circumference of the bolt shaft. The anaerobic sealant is activated during assembly of the unit, then hardens as a result of chemical transformations. This ensures reliable fixation of the bolt from unscrewing.



Unless otherwise stated, undamaged bolts with anaerobic sealant may be reused. To do this, follow these steps:

• Clean the bolt body and threaded hole from any remaining anaerobic sealant.
• Clean the threads from oil.
• Apply recommended thread sealant to threads.

A bolt with anaerobic sealant can be replaced with a similar bolt, provided that a special anaerobic sealant is used during installation.

Self-locking bolts

Self-locking screws and bolts (meaning bolts with nylon insert) can be reused provided that an increase in tightening resistance is felt when starting to tighten the part of the bolt with the insert.

Self-locking bolts or screws have a nylon insert that is installed during the manufacturing process of the bolt. These bolts can be identified by a colored insert that extends halfway around the bolt shank.

Another type of self-locking bolt is a bolt with a thread that is slightly out of alignment with the thread of the counter hole or nut into which the bolt is screwed.

DO NOT reuse self-locking bolts for critical assembly. (engine bearings, flywheel mounting bolts). Always replace a self-locking bolt, screw or nut with similar parts.



(Information obtained from the website: www.lrman.ru)

DO NOT install conventional fasteners in place of the self-locking nuts, bolts or screws provided by the design.

Designation of nuts

Nuts with metric ISO threads and strength index 8, 12 or 14 are designated by applying the index to one of the ends of the nut or to one of the hexagon faces. Some nuts with strength index 4, 5 or 6 also have a strength index designation. Some nuts may be designated by the symbol "M" on the end opposite the end with the strength index. This symbol designates metric threads.

Instead of indicating the strength index, the so-called "clock" method of indicating the strength index is sometimes used. A mark is applied to the outer chamfer or end face of the nut, which corresponds to the readings of the clock hands. The "clock" readings are the designation of the strength index.

A dot is used to indicate the 12 o'clock mark, and a dot is used to indicate the progress of the clock. (strength index values) a notch is used. If the strength index is greater than 12, a double dot is used to indicate the 12 o'clock mark.



When tightening a crown nut that has cotter pin slots, never loosen the nut to align the cotter pin holes unless the adjustment instructions so require. If you cannot align the cotter pin holes, try replacing the washer or nut or grinding down the existing washer.

If the bearing preload is adjusted using a nut, the nut must be tightened in accordance with the individual instructions.

Self-locking nuts

Self-locking nuts (refers to nuts with nylon insert or nuts with increased thread friction) can be reused provided that an increase in tightening resistance is felt at the moment the part of the nut with the insert begins to tighten.

When the self-locking nuts are completely loosened, it is recommended to replace them with new ones of similar design.