1998 — 2003 of release

Repair and operation of the car

Lexus RX 300
+ Lexus RX-300 cars
+ Governing bodies and methods of operation
+ Settings and routine maintenance of the car
- Engine
   General information and preparatory operations
   Check of compression pressure
   Check of the engine by means of the vacuum gage
   Reduction of the piston of the first cylinder in the provision of the top dead point (TDP)
   Check of a corner of an advancing of ignition
   Removal, check and installation of a belt of the GRM drive of its natyazhitel, pulley and cogwheel of a bent shaft, cogwheels of camshafts and intermediate rollers
   Removal, dismantling, check, assembly and installation of a head of cylinders and its components
   Removal and installation of the engine, check of support
   Block of cylinders
   Check of D/V of pressure of motive oil
   Removal, dismantling, check, assembly and installation of the oil pump and pallet of a case
+ Cooling systems of the engine, heating, ventilation and air conditioning
+ A power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Automatic transmission and interaxal differential
+ Transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schematic diagrams of electric connections


General information and preparatory operations

General information

The description of the most typical and important procedures of service and repair of the engine is provided in this chapter, except for the procedures demanding special skills and tools, such as procedures of capital repairs of the engine – these works should be charged to specialists of car service.

3.0 are established camshafts by the l V-shaped 6-cylinder 24-valvate engines 1MZ-FE with four (on two on each number of cylinders) located from above cross 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 block head, as well as saddles of valves.

Camshafts are located in heads of the block of cylinders and are given to rotation from a bent 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 the cooling system is located on the right side of the block of cylinders and is given by a GRM belt.

For preparation of fuel-air mix the electronic system of injection of fuel serves. The spark, necessary for mix ignition, is created by unregulated system of ignition.

Oil in the lubrication system moves under pressure by means of the rotor pump. The reducing valve which opens at excess of pressure above the established value and allows a part of oil to flow down back in the case pallet is installed on the pressure head side of the oil pump. Oil is soaked up from a case through a maslozabornik. The pump directs oil to the replaceable full-line filter. At a contamination of an 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 D/V of pressure of motive oil which warns the driver about oil pressure decline, including the control lamp located on the dashboard is located. From the main gallery oil is brought to radical bearings of a bent shaft and a head of the block of cylinders.

Oil is brought to conrod bearings through internal drillings in a bent 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 sprayed, as well as other internal knots of the engine.

Preparatory operations

Before holding any procedures of service of the engine make cleaning of a motive compartment and the external surfaces of the power unit with use of special solvent. Such processing will allow to avoid hit of dirt in the engine.

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

The excessive consumption of motive oil can be considered a signal of need of conducting check of a condition of piston rings, maslootrazhatelny caps and/or the 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 Compression Pressure) to define the general condition of the engine.

Loss of the developed power, violation of stability of turns, excessive noise of the valvate mechanism and the increased fuel consumption usually are rather characteristic signs of need of performance of capital repairs 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 problems, carrying out the general mechanical works on restoration of the engine will be the only way out.

Capital repairs of the power unit mean restoration of all its working parameters to the level characteristic of the new engine. During capital repairs 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 conrod bearings is usually carried out, the pro-point and restoration of necks of a bent shaft can be in case of need made. Service of valves which condition at the time of emergence of need for performance of capital repairs 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 recovery repair of a starter and the generator is usually made.

Such critical components of the cooling system as hoses, driving belts, the thermostat and the water pump when carrying out capital repairs of the engine have to be replaced with new without fail. Besides, it is necessary to check attentively a condition of a radiator (see the Head of the Cooling system of the engine, heating, ventilation and air conditioning). In case of identification of signs of development of leaks or violation of passability the radiator should be replaced. Do not forget to check a condition of the oil pump also.

Capital repairs of the engine do not demand from the performer of high vocational training at all, however take away a lot of time. It is necessary to plan refusal of use of 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 work.

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

Do not forget that in a question of expediency of performance of capital repairs of the engine the condition of the block of its cylinders is decisive factor. Frequent cheaper and more reliably it appears to replace the worn-out engine restored.

In conclusion it is possible to notice that all efforts on performance of recovery repair of worn-out components will be spent for nothing at the negligent relation to the requirement of respect for purity at assembly of the unit.

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