Audi 100/A6

1990-1997 of release

Repair and car operation

3.3.8. Pistons and rods

THE GENERAL DATA

The piston and rod

1. Piston rings 2. The piston 3. A piston finger 4. A lock ring 5. A rod 6. The rod loose leaf 7. The block of cylinders 8. A rod cover

9. An adjusting pin 10. An oil jet 11. The screw of an oil jet 12. Bolts of a cover of a rod And – identification labels on a rod and a rod cover In – ориентационные labels

Removal

The piston and rod

PERFORMANCE ORDER

1. Remove a head of cylinders, a flywheel, the oil pallet, the oil pump and маслозаборный a branch pipe. 2. Remove a ledge in the top part of the cylinder, formed as a result of deterioration. 3. If rods and covers of rods are not marked, mark them. 4. Establish pistons N1 and N4 in the bottom dead point. 5. Turn off fixing nuts, and uncover the first rod and the bearing loose leaf, mark loose leaves. 6. Put on pieces of a rubber tube rod bolts not to damage a neck of a cranked shaft and a cylinder wall. 7. Remove the loose leaf of the bearing and get a rod from above the block of cylinders. 8. Remove other rods and pistons similarly. 9. Whenever possible unscrew screws and remove jets of pistons.

Check

Piston head (ААТ)

PERFORMANCE ORDER

1. A small screw-driver remove lock rings of a piston finger and remove a finger. Examine a finger on presence of deterioration and damages, at detection of damages address to experts. 2. Remove piston rings. Clear a head of the piston of adjournment and clean flutes for piston rings. After removal of all adjournment. Clear pistons and rods solvent and dry up them. 3. Carefully examine all pistons on presence of cracks on a skirt of the piston and around шатунного a finger. Examine pistons on presence of scratches, задиров, the scorched areas or corrosion. 4. Examine rods on presence of cracks and other damages. For more detailed checking of pistons and rods address to experts 5. Measure diameters of all four pistons. 6. Measure a lateral backlash of piston rings. 7. At carrying out of assemblage of the piston and a rod, pay attention that the arrow on a piston head should specify aside газораспределительного a belt. Labels on a rod and on a rod cover should be directed in турбонагнетатель the party.

Check of a lubricant backlash шатунных bearings

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

Temporarily establish the piston in the cylinder, tighten bolts of covers of rods, and check up a lubricant backlash шатунного the bearing to similarly check of a lubricant backlash of radical bearings.

If backlash size do not correspond demanded, possibly, loose leaves of the wrong size are established.

Definitive installation of pistons and rods

Arrangement of pistons and the coding in diesel engines

PERFORMANCE ORDER

1. Remove all traces of plastic. Check up, that the surface of loose leaves was absolutely pure, and grease with their engine oil. 2. Clean the top loose leaf of the bearing of a rod and establish it on a rod. Lubricant apertures 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 compressor of piston rings. 5. Turn a cranked shaft so that шатунный the bearing of the first cylinder was in the family way the bottom dead point, and grease cylinder walls. 6. Check up, that the mark from above the piston has been turned forward. 7. Press on the piston and establish it in the cylinder. 8. Installation of other rods is spent similarly. 9. Establish a rod on a neck of a shaft and establish a rod cover. And – a pin (only a diesel engine) In – an adjusting aperture (only a diesel engine) 10. In diesel 4 cylinder engines 1Z and AHU and 5 cylinder ABP, AAT, AEL pistons have the special form for the best combustion of a mix and should be correctly established (fig. the Arrangement of pistons and the coding in diesel engines) see. 11. Tighten bolts till the demanded moment of an inhaling. 12. Hold on bolts on a demanded corner. 13. After installation of all rods turn a cranked shaft some times and check up ease of a course.

DIESEL ENGINES 1Z, AHU, AAS, ABP, AAT, AEL

PERFORMANCE ORDER

13. For exact selection of a thickness of a lining measure ledges of pistons by means of the special tool.