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
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Check of compression pressure
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Implementation of the procedure of check of compression pressure will require the help of the assistant. |
The measurement of compression pressure allows to make general idea about current state of such internal components of the engine as laying of heads of cylinders, elements of the valvate mechanism, pistons and piston rings. The analysis of results of check allows to define whether the engine needs capital recovery repairs, or it is enough to replace only sealing laying of a head of cylinders. Measurement is performed by means of a kompressometr.
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- Warm up the engine up to the normal working temperature (about the 80th hail.) also muffle it.
- Make sure of completeness of a charge of the rechargeable battery that at an engine provorachivaniye a starter it was possible to receive not less than 250 rpm.
- Remove a windshield fairing (see the Head Kuzov).
- Turn out spark plugs (see the Section Check and replacement of spark plugs).
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Prepare компрессометр and screw its nozzle in a candle opening of one of cylinders.
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- Completely open a butterfly valve and, turning the engine a starter, consider indications of a kompressometr. Write down result of measurement.
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Time of carrying out measurement has to be as it is possible well. |
- Repeat procedures for the remained engine cylinders.
- Compare results of measurement by requirements of Specifications of the Head Dvigatel.
- The compression grows in the serviceable engine very quickly. The low value shown after the first cycle, increasing with the subsequent cycles indicates wear of piston rings. The low value after the first cycle which is not increasing after the following indicates existence of leaks via valves, or the punched laying of a head of the cylinder (also the crack in a head can be the cause). Can lead existence of a deposit on plates to decrease in a compression of valves.
- The results received at measurement of a compression have to be approximately identical to all cylinders. If pressure is in any cylinder at the level of minimum admissible and even below, then for clarification of the reason pour in the cylinder through a candle opening in a teaspoon of motive oil and repeat measurement of a compression.
- If oil addition temporarily improved a compression, most likely, wear of the piston, rings or the cylinder is the reason of its decrease. If increase in a compression did not happen, then it is possible to assume that the reason – in leakage of valves or the punched laying of a head of the block.
- The low compression in two next cylinders almost for certain is a consequence of breakdown of laying of a head. Availability of cooling liquid in combustion chambers or in a case of the engine will confirm this assumption.
- If the compression in one of cylinders is about 20% lower, than in the others, besides turns of idling are unstable, then the reason, perhaps, excessive wear of a cam of the camshaft.
- After conducting check disconnect компрессометр and install the being removed components.
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