Repair and operation of the car
+ Cars of the Honda Accord brand
+ Settings and routine maintenance
+ Four-cylinder engines
- V6 engines
Preparatory actions and the list of repair procedures which can be executed without extraction of the engine from the car
Reduction of the piston of the first cylinder in the provision of the top dead point (TDP)
Removal and installation of covers of heads of cylinders
Removal and installation of the inlet pipeline
Removal and installation of final collectors
Removal, check of a state and installation of a gas-distributing belt and cogwheels of the GRM drive
Replacement of a forward epiploon of a bent shaft
The VTEC system - the general information
Removal, check of a state and installation of assembly of yokes
Removal, check of a state and installation of camshafts
Replacement of maslootrazhatelny caps and valvate springs with plates
Removal and installation of heads of cylinders
Removal and installation of the pallet of a case of the engine
Removal, check of a state and installation of the oil pump
Removal and installation of a driving disk
Replacement of a back epiploon of a bent shaft
Check of a state and replacement of support of a suspension bracket of the power unit (V6 Engines)
System of correction of a suspension bracket of the power unit - the general information and check of serviceability of functioning
+ General and capital repairs of the engine
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Engine management
+ Gear shifting box
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
The VTEC system - the general information
General informationThe VTEC system is developed by specialists of the Honda company for the purpose of a possibility of dynamic management of installation of phases of gas distribution and extent of opening of valves. The engines equipped with this system are marked by the inscription VTEC formed on a cover of a head of cylinders. All V6 engines used to a complete set of the considered models of cars are equipped with the VTEC system.
Difference of the engines equipped with the VTEC system from the basic version consists only in principle managements of phases of gas distribution and features of the device of the valvate mechanism.
The onboard processor of a control system of the engine of the equipped VTEC models is capable to correct the moments of operation and extent of opening of inlet valves due to use of cams of the camshaft of various size and a form. Depending on the data arriving from the information sensor, the processor, either includes, or disconnects system.
The order of functioning of the VTEC system is defined by the following initial parameters:
a) Frequency of rotation of the engine (rpm);
b) Speed of the movement of the car (miles/h);
c) Output signal of the sensor of provision of a butterfly valve (TPS);
d) The current load of the engine determined by indications of the sensor of absolute pressure in the inlet pipeline (MAR);
e) Temperature of cooling liquid.
The camshaft is equipped with three cams of the drive of each of the inlet valves of the engine differing from each other in a form of a profile and height of rise by which duration and size of opening of the corresponding valves are defined.
At small turns of the engine secondary inlet valves work from own cams of the camshaft having very small rise and a peaked form (i.e. valves, in comparison with primary, are slightly opened only slightly and very much for a while), holding the sprayed fuel from consolidation in a head of cylinders. At the same time the good lower torque with high speed of reaction develops that defines excellent traction characteristics and high acceleration performance of the car. Primary cams at the same time function in the normal mode, creating turbulences of gas mixture in combustion chambers.
If there is a need for increase in return of the engine, secondary yokes are blocked through intermediate with primary special synchronizing pistons. The synchronizing pistons have the hydraulic drive with electronic control. When blocking yokes both inlet valves begin to open in the identical mode, and degree and duration of their opening are defined by a form of a cam of an intermediate yoke and have the increased value.
Check of a condition of components
Electromagnetic valve of management of VTEC blocking
Proofreaders of valvate gaps
The synchronizing assemblies