LEXUS RX 300

1998 — 2003 of release

Repair and car operation

General information and preparatory operations

General information

3.0 l V-shaped 6-cylinder 24-klapanny engines 1MZ-FE with four (on two on each number of cylinders), located from above, camshafts are established cross-section in a forward part of the car. Automatic transmission is located at the left.

Inlet and final valves are given from camshafts through pushers. Valves are located in the directing plugs pressed in a head of the block, as well as a saddle of valves.

Camshafts are located in heads of the block of cylinders and are brought into rotation from a cranked shaft by means of a belt. In each number of cylinders one camshaft puts in action inlet valves, and another – final valves.

The pump of system of cooling is located on the right side of the block of cylinders and is brought by a GRM belt.

For preparation of a toplivovozdushny mix the electronic system of injection of fuel serves. Necessary for mix ignition the spark is created by noncontrollable system of ignition.

Oil in system of greasing moves under pressure by means of the rotor pump. On the pressure head party of the oil pump the reduktsionny valve which opens at pressure excess above the established value is established and let's parts of oil flow down back in the case pallet. Oil is soaked up from a case through a maslozabornik. The pump directs oil to the replaceable polnopotochny filter. At a contamination of the oil filter perepuskny the valve directs oil directly to the main canal bypassing the filter.

From the filter oil moves in the main gallery located in the block of cylinders. In the main gallery it is located Д/В pressure of impellent oil which warns the driver about oil pressure decline, including the control lamp located on the dashboard. From the main gallery oil is brought to radical bearings of a cranked shaft and a head of the block of cylinders.

Oil is brought to shatunny bearings through internal drillings in a cranked shaft. In a head of the block of cylinders there are two oil galleries, one passes along a shaft of inlet valves, another – along a shaft of final valves. Through these galleries oil is brought to bearings of shaft and pushers of valves.

To bearings of all shaft oil moves under pressure, valves and cams of camshafts are oiled being sprayed, as well as other internal knots of the engine.

Preparatory operations

Before carrying out any procedures of service of the engine make cleaning of an impellent compartment and external surfaces of the power unit with application of special solvent. Such processing will allow to avoid dirt hit in the engine.

In case of need, the forthcoming work defined by character, it is possible to remove a cowl for the purpose of ensuring freedom of access to components subject to service (see. Section Removal and installation of a cowl, its lock and decorative reshyotka of a radiator). In order to avoid casual damage of a paint and varnish covering cover car wings with special covers or old blankets.

It is possible to consider an excessive consumption of impellent oil as a signal about need of carrying out check of a condition of piston rings, maslootrazhatelny caps and/or directing plugs of valves. Naturally, first of all, it is necessary to make sure that losses of oil are not connected with development of its external leaks. Check a compression in cylinders (see. The section Check of kompressionny pressure) to define the general condition of the engine.

Loss of the developed capacity, violation of stability of turns, excessive noise of the klapanny mechanism and the increased fuel consumption usually are rather characteristic signs of need of performance of major maintenance of the engine, in particular, when all these factors are shown at the same time. If performance of a full range of settings does not help with elimination of the problems, carrying out the general mechanical works on engine restoration will be the unique way out.

Major maintenance of the power unit means recovery of all of its working parameters to level, characteristic for the new engine. During major maintenance replacement of piston rings and restoration of mirrors of cylinders (a pro-point and/or a honingovaniye) is without fail made. Replacement of radical and shatunny bearings is usually carried out, the pro-point and restoration of necks of a cranked shaft can be in case of need made. Service of the valves which condition at the moment of emergence of need for performance of major maintenance of the engine almost for certain leaves much to be desired is without fail carried out. In parallel with carrying out the general repair of the power unit also regenerative repair of a starter and the generator is usually made.

Major maintenance of the engine at all does not demand from the performer of high vocational training, however takes away a lot of time. It is necessary to plan refusal of using the car for the term of not less than two weeks, in particular in need of the request for the help in a mechanical workshop for the purpose of performance of separate recovery operations.

The most part of works can be executed with application of a usual set of the metalwork tool, however some of checks by determination of suitability of separate components to further use demand use of the precision measuring equipment. In doubtful situations address for the help to experts HUNDRED.

In summary it is possible to notice that all efforts on performance of regenerative repair of worn-out components will appear spent for nothing at the negligent relation to the requirement of observance of purity at unit assembly.