since 1993-1999 release
Repair and operation of the car
+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Repair of engines
+ 3.1. SOHC engines of 2,0 liters
+ 3.2. DOHC engines of 2,0 liters
+ 3.3. 2,5 and 3,0 liters engines
- 3.4. Partition of all petrol engines
3.4.1. Technical characteristics
3.4.2. Check of a compression
- 3.4.3. Engine partition
188.8.131.52. Capital repairs of the engine
184.108.40.206. Diagnostics of the engine by means of the vacuum gage
220.127.116.11. Check of a compression in engine cylinders
18.104.22.168. Capital repairs of the engine - an alternative 3_4_3_5.htm
22.214.171.124. Block of cylinders of an incomplete complete set
126.96.36.199. Repair engine (block of cylinders of a full complete set)
3.4.4. Auxiliary elements of the engine
+ 3.4.5. Engine
3.4.6. Engine partition
3.4.7. Head of cylinders and valves
3.4.8. Pistons and rods
3.4.9. Bent shaft
3.4.10. Block of cylinders
3.4.11. Radical bearings and bearings of rods
3.4.12. Piston rings
3.4.13. The first start of the engine after a partition
+ 3.5. 2,0 liters diesel engine
+ 3.6. 2,5 liters diesel six-cylinder engine
+ 4. Heating system and ventilation
+ 5. Fuel, exhaust systems
+ 6. System of start of the engine
+ 7. System of ignition
+ 8. Coupling
+ 9. Transmissions
+ 10. Main transfer, half shafts
+ 11. Brake system
+ 12. Suspension bracket and steering
+ 13. Body
+ 14. Body electric equipment
Measurement of depression is reliable and rather cheap way of diagnostics of the engine. According to indications of the vacuum gage it is possible to gain an impression about a condition of piston group, about tightness of laying of a head of the block of the cylinders which are soaking up and final collectors, correctness of adjustments of a power supply system of the engine and production of exhaust gases, the capacity of exhaust gases, a condition of valves (their sticking or a burn-out) and springs of valves, and also to check correctness of adjustment of the moment of ignition and preservation of phases of gas distribution during the operation of the engine.
Unfortunately, it is difficult to interpret indications of the vacuum gage and results of the analysis of indications can be wrong therefore, it is expedient to unite vacuum diagnostics with other methods.
Initial factors on which indications of the vacuum gage are analyzed and draw the most exact conclusions about a condition of the engine, absolute instrument reading and the nature of the movement of an arrow of the device (dynamics of indications) are. The scale of the majority of vacuum gages is graduated in mm. рт. column. In process of depression increase (and according to pressure drop) instrument reading increases. On each 300 m above sea level absolute indications of the vacuum gage will differ approximately on 25 mm Hg.
Attach the vacuum gage directly to the soaking-up collector, but not to other openings through which vacuum, is created by the channel of a certain length separated from a collector (for example, to openings before a butterfly valve).
Before tests completely warm up the engine. Block wheels and put the car on the emergency brake. At position of the lever of gear shifting in neutral situation (or in situation Park on cars with automatic transmission) start the engine and leave to idle.
Check the indication of the vacuum gage. On the serviceable engine the vacuum gage has to show depression of 430-560 mm Hg, and the arrow of the device has to be not mobile almost.
Below the description of character of indications of the vacuum gage and a technique of definition of a condition of the engine on their basis follows.