Opel Astra A

1991-1998 of release

Repair and operation of the car

Opel Astra A
+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engines
   - 3.1. SOHC engines
      3.1.1. Introduction
      3.1.2. Technical characteristics
      3.1.3. Check of a compression
      3.1.4. Top Dead Point (TDP)
      3.1.5. Cover of a head of cylinders
      3.1.6. Pulley of a kolechaty shaft
      + 3.1.7. Top external cover of a gas-distributing belt
      3.1.8. Back cover of a gas-distributing belt
      3.1.9. Gas-distributing belt (models of 1,4 and 1,6 l)
      3.1.10. A gas-distributing belt (C18 NZ, C20 NE which are released till 1993)
      3.1.11. Gas-distributing belt (C18 NZ, C20 NE 1993 of release later)
      3.1.12. Camshaft asterisk
      3.1.13. Asterisk of a bent shaft
      3.1.14. Tension roller of a gas-distributing belt (l models 1,4 and 1,6)
      3.1.15. Camshaft epiploons
      3.1.16. Camshaft
      3.1.17. Head of cylinders
      3.1.18. Oil pallet and maslozaborny branch pipe
      3.1.19. Oil pump
      3.1.20. Epiploons of a bent shaft
      3.1.21. Flywheel
      3.1.22. Fastening of the engine and transmission
   + 3.2. DOHC engines
   + 3.3. Diesel engines
   + 3.4. Engine electric equipment
+ 4. Ventilation and heating
+ 5. Power supply system
+ 6. System of decrease in toxicity
+ 7. Coupling
+ 8. Transmissions
+ 9. Half shafts
+ 10. Brake system
+ 11. Suspension bracket and steering
+ 12. Body
+ 13. Electric equipment
+ 14. Electrical circuitries


3.1.3. Check of a compression

1. If the engine works badly or with interruptions, check system of ignition and fuel system. If the reasons of bad operation of the engine did not manage to be found, carry out an inspection of a compression. Regular conducting this check will allow you to prevent emergence of malfunctions also in advance.
2. For conducting check the engine has to be warmed, the accumulator has to be charged, and spark plugs – are unscrewed.
3. Disconnect system of ignition: disconnect a wire of high voltage of system of ignition from a cover of the distributor of ignition and ground it on the block of cylinders.
4. Connect the device for measurement of a compression to a N1 cylinder spark plug opening.
5. Completely open a butterfly valve and scroll a bent shaft of the engine a starter. After one or two turns pressure of compression has to will increase to the maximum mark, and then to be stabilized. Write down the received result.
6. Carry out a similar inspection with other cylinders and write down the received indications.
7. Pressure in all cylinders has to be identical. The difference more than in 2 bars between any two cylinders means malfunction. In the serviceable engine pressure has to increase quickly. The low pressure of the first step which is gradually increasing at the subsequent steps indicates that piston rings are worn-out. Low pressure of the first step which does not increase at the subsequent steps indicates leak in valves or on the punched laying of a head. Deposits on the lower parts of valves can become the reason of a low compression also.
8. If when conducting check you have doubts, address experts.
9. If pressure in any cylinder too low, carry out the following inspection to establish the reason. Pour in a teaspoon of pure engine oil in the cylinder through an opening of a spark plug and repeat check of pressure.
10. If after oil addition pressure of compression increased, then it means that the piston or the cylinder is worn-out. If pressure did not increase, so the reason in the worn-out or burned valves or in the punched laying of a head of cylinders.
11. Low pressure in two next cylinders practically always means that between them laying of a head is punched.
12. If in one of cylinders pressure is about 20% lower, than in the others, and the engine badly idles, the reason, most likely, in a worn-out cam of the camshaft.
13. If pressure too big, perhaps, walls of combustion chambers are covered with coal deposits.
14. After completion of check screw in spark plugs on places and connect system of ignition.

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