since 1993-1999 of release
Repair and car operation
+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Repair of engines
+ 3.1. SOHC engines in volume 2,0 liters
+ 3.2. DOHC engines in volume 2,0 liters
+ 3.3. Engines in volume 2,5 and 3,0 liters
- 3.4. Partition of all petrol engines
3.4.1. Technical characteristics
3.4.2. Compression check
- 3.4.3. Engine partition
18.104.22.168. Major maintenance of the engine
22.214.171.124. Engine diagnostics by means of the vacuum gage
126.96.36.199. Compression check in engine cylinders
188.8.131.52. Major maintenance of the engine - alternatives 3_4_3_5.htm
184.108.40.206. Block of cylinders of an incomplete complete set
220.127.116.11. 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. Cranked 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. Diesel engine in volume 2,0 liters
+ 3.6. Diesel six-cylinder 2,5-liter engine
+ 4. Heating system and ventilation
+ 5. Fuel, exhaust systems
+ 6. System of start of the engine
+ 7. Ignition system
+ 8. Coupling
+ 9. Transmissions
+ 10. Main transfer, semi-axes
+ 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 receive idea of a condition of piston group, of 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, capacity of exhaust gases, a condition of valves (their zalipaniye 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 a gazoraspredeleniye at operation of the engine.
Unfortunately, indications of the vacuum gage are difficult for interpreting and results of the analysis of indications can be erroneous therefore, vacuum diagnostics is expedient for uniting with other methods.
Initial factors on which indications of the vacuum gage are analyzed and the most exact conclusions about an engine condition become, absolute instrument reading and nature of movement of an arrow of the device (dynamics of indications) are. A scale of the majority of vacuum gages проградуирована in mm. рт. column. In process of depression increase (and respectively 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 a soaking-up collector, but not to other openings through which the vacuum, by the channel of a certain length separated from a collector (for example, to openings before a butterfly valve is created).
Before the beginning of tests completely warm up the engine. Block wheels and put the car on the hand brake. At position of the lever of gear shifting in neutral situation (or in the situation Park on cars with automatic transmission) start the engine and leave to idle.
Check the vacuum gage indication. On the serviceable engine the vacuum gage should show depression of 430-560 mm Hg, and the arrow of the device should be almost motionless.
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.