Opel Omega

since 1993-1999 of release

Repair and car operation

Opel Omega
+ 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
      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

3.4.8. Pistons and rods


1. In SOHC engines of 2,0 liters remove a head of cylinders and the oil pallet. Remove a maslozaborny branch pipe and a dividing partition.
2. In engines in 2,0 liters remove a head of cylinders, the oil pallet and a maslozaborny branch pipe. In the models which have been let out after 1998, remove counterbalancing block of a cranked shaft. In earlier models remove a dividing partition of the pallet.
3. In engines 2,5 and 3,09 of liter remove heads of cylinders and the oil pallet. Remove a dividing partition.
4. Remove ledges in the top part of the cylinders, formed as a result of wear.
5. If rods and covers of rods are not marked, mark them. In engines in volume 2,0 liters the N1 cylinder is located from a gas-distributing belt. In engines in volume 2,5 and 3,0 liters the N1 cylinder is located in the right part of the block of cylinders from a gas-distributing belt.
6. Establish the N1 piston in the bottom dead point.
7. Unscrew bolts of a cover of the bearing of the first rod. Uncover a rod and the bottom loose leaf of the bearing, mark the loose leaf.
8. Remove the loose leaf of the bearing and get a rod from above the block of cylinders.
9. Remove other rods and pistons similarly.


1. Remove old piston rings. Clean a piston head from deposits and clean flutes for piston rings. After removal of all deposits clean pistons and rods solvent and dry up them.
2. If pistons and walls of the cylinder are not so worn-out and cylinders were not chiseled, it is not required to establish new pistons.
3. Carefully examine all pistons on existence of cracks on a skirt of the piston and round a shatunny finger.
4. Examine pistons on existence of scratches, задиров, the scorched areas or corrosion.
5. Measure diameters of pistons and compare the received results to technical requirements.
6. Measure a gap between the piston and the cylinder. For this purpose it is necessary to take away diameter of the piston from diameter of the cylinder or to insert the piston into the cylinder and to measure a gap the shchupy. If the gap is too great, it is necessary to replace the piston.
7. Do similar procedure with other pistons.
8. Examine rods on existence of cracks and other damages. For more detailed checking of pistons and rods address to experts.
9. In engines in volume 2,0 and 2,5 liters the piston finger is motionlessly fixed in the rod bearing therefore for replacement of the piston or a rod address to the expert.
10. In engines in volume 3,0 liters a small screw-driver remove lock rings of a piston finger and remove a finger.
11. Examine a finger on existence of wear and damages, at detection of damages, replace a finger and a rod.
12. Grease piston fingers and collect pistons and rods so that shooters on heads of pistons (drawing at the left) and labels in the bases of rods (drawing on the right) were sent to the opposite sides.

Installation and check of a lubricant gap of shatunny bearings

Selection of loose leaves

For the correct selection of loose leaves be guided by size of a lubricant gap which it is possible to measure by means of a plastic measuring tape. At emergence of any problems with selection of loose leaves address to experts.

Check of a lubricant gap of shatunny bearings

For measurement of a lubricant gap it is possible to use an internal micrometer or other special device, but the most exact and easy method – to use a special plastic measuring instrument.

1. Temporarily establish the piston in the cylinder, establish loose leaves, tighten bolts of covers of rods and check a lubricant gap of the shatunny bearing similar to check of a lubricant gap of radical bearings.
2. If size of a gap do not correspond demanded, possibly, loose leaves of the wrong size are established.

Final installation of pistons and rods

1. Remove all traces of plastic. Check, that the surface of loose leaves was absolutely pure, and grease them with engine oil.
2. Clean the top loose leaf of the bearing of a rod and establish it on a rod. Lubricant openings of a rod and the loose leaf should be combined.
3. Clean the second loose leaf and establish it in a rod cover.
4. Grease pistons and rings and compress piston rings by means of the special tool.
5. Turn a cranked shaft so that the shatunny bearing of the first cylinder was in the family way the bottom dead point and grease cylinder walls.
6. Check, that the arrow on a head of the piston was turned towards a gas-distributing belt.
7. Press on the piston and establish it in the cylinder.
8. Establish a rod on a shaft neck, establish a rod cover so that the ledge (it is specified by an arrow) on a cover was directed towards a flywheel.
9. Insert fixing bolts of a cover.
10. Tighten bolts till the demanded moment of an inhaling.
11. Hold on bolts on a necessary corner.
12. Similarly establish other pistons.
13. After installation of all rods turn a cranked shaft several times and check ease of a course.
14. Depending on model of the engine establish the remained details.