LEXUS RX 300

1998 — 2003 of release

Repair and car operation

Technology of service, tool and workplace equipment

Technology of service

There are some techniques of performance of procedures of maintenance and car repairs on which the reader can find references in the text of this Management. Following to it will make work of more effective, will allow to organize in the best way a workplace and qualitatively to execute various technical procedures.

Fixture

Prirzhavevshiye for simplification of their otdavaniye and in order to avoid their damage should be processed bolts and nuts special getting structure. Many mechanics prefer to use for this purpose turpentine which it is convenient to put from the special small canister with a long nouse. After wetting of the "become attached" fixture by getting structure before starting its otdavaniye, it is necessary to give to structure within several minutes to impregnate the oxidized contact layer. Strongly rusted fixture can be cut down a chisel, to cut a hacksaw or to remove by means of special гайколома.

When cutting a head of a bolt or a hairpin oblamyvaniya on assembly, the rest of a carving part can be drilled or taken by means of the special tool. The majority metalwork and repair trucks can undertake performance of this, also as well as others (for example, restoration of the broken carving in carving openings), repair procedures.

At assembly it is necessary to establish flat and lock washers always into place in the same order and the same way, as earlier. The damaged washers always replace new. Between a lock washer and a soft metal surface (for example, aluminum), thin sheet metal or plastic always it is necessary to establish flat washers.

Sizes of fixture

For many reasons manufacturers of cars everything wider and more widely apply metric fixture. However, it is important to know a difference between fixture used sometimes SAE (called also American) and more universal in system of measures metric fixture as, despite external similarity, they are not interchangeable is standard.

All bolts as the SAE standard, and metric, are classified on diameter, a step of a carving and length. For example, the bolt of SAE 1/2-13x1 has half-inch in diameter, 13 rounds of a carving on one inch and length of 1 inch. Metric bolt M12-1.75x25 has diameter of 12 mm, a step of a carving of 1.75 mm and length of 25 mm. Both bolts are outwardly almost identical, however are not interchangeable.

In addition to the listed signs bolts can be identified by survey of their head. The distance between лысками heads of a metric bolt is measured in mm, whereas at a SAE standard bolt — in inches (the same is fair and for nuts). As a result, the wrench on the SAE standard is not necessary for use with metric fixture, and on the contrary).

Sizes and marking of a class of durability of bolts of the SAE and USS standards

G — Marking of a class of durability L — Length (in inches) T — a carving Step (quantity of rounds on inch) D — Nominal diameter (in inches)

Sizes and marking of a class of durability of metric bolts

P — a durability Class L — Length, mm T — a carving Step (distance between the next rounds, mm) D — Nominal diameter, mm

Besides, on heads of the most part of bolts of the SAE standard usually there are the radial risks defining the maximum admissible effort of a tightening of a bolt (durability degree). The more the quantity рисок, the is higher admissible effort (on cars bolts with durability degree from 0 to 5 are usually applied). The class of durability of metric bolts is defined by a digital code which is usually cast on a bolt head.

Marking of a class of durability of bolts (at the top of SAE and USS, below — metric)

1 — the Class of durability 1 or 2 2 — the Class of durability 5 3 — the Class of durability 8

Marking of a class of durability of six-sided nuts of the SAE and USS standards