Opel:: Omega B:: Pistons and rods

3.4.8. Pistons and rods

Removal

PERFORMANCE ORDER

1. In SOHC engines 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 produced after 1998 remove the counterbalancing block of a bent 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 the ledges in the top part of cylinders formed as a result of wear.
	5. If rods and covers of rods are not marked, mark them. In the 2,0 liters engines the N1 cylinder is located from a gas-distributing belt. In the 2,5 and 3,0 liters engines the N1 cylinder is located in the right part of the block of cylinders from a gas-distributing belt.
6. Install the N1 piston in the lower dead point.
7. Unscrew bolts of a cover of the bearing of the first rod. Uncover a rod and the lower insert of the bearing, mark an insert.
8. Remove an insert of the bearing and get a rod from above of the block of cylinders.
9. Remove other rods and pistons similarly.

Check

PERFORMANCE ORDER

	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 really worn-out and cylinders were not chiseled, new pistons are not required to be installed.
3. Carefully examine all pistons on existence of cracks on a skirt of the piston and around a conrod finger.
4. Examine pistons on existence of scratches, zadir, the burned 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 by the probe. If the gap is too big, the piston needs to be replaced.
7. Do the similar procedure with other pistons.
8. Examine rods on existence of cracks and other damages. For more detailed checking of pistons and rods address experts.
9. In the 2,0 and 2,5 liters engines the piston finger is not movably fixed in the rod bearing therefore for replacement of the piston or a rod address the expert.
10. In the 3,0 liters engines the 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 (the drawing at the left) and tags in the bases of rods (the drawing on the right) were sent to the opposite sides.

Installation and check of a lubricant gap of conrod bearings

Selection of inserts

For the correct selection of inserts be guided by the size of a lubricant gap which can be measured by means of a plastic measuring tape. At emergence of any problems with selection of inserts address experts.

Check of a lubricant gap of conrod 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 the special plastic measuring instrument.

PERFORMANCE ORDER

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

Final installation of pistons and rods

PERFORMANCE ORDER

1. Remove all traces of plastic. Check that the surface of inserts was absolutely pure, and oil them engine.
2. Clean the top insert of the bearing of a rod and establish it on a rod. Lubricant openings of a rod and an insert have to be combined.
3. Clean the second insert and establish it in a rod cover.
	4. Grease pistons and rings and squeeze piston rings by means of the special tool.
5. Turn a bent shaft so that the conrod bearing of the first cylinder was in the family way of the lower 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 install 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 required inhaling moment.
	11. Hold on bolts on a necessary corner.
12. Similarly install other pistons.
13. After installation of all rods turn a bent shaft several times and check ease of the course.
	14. Depending on model of the engine establish the remained details.