Audi 100

1982-1990 of release

Repair and car operation

3.1.2.16. Survey and check of details of shatunno-piston group

THE GENERAL DATA

The scheme of measurements of diameter of the cylinder

And, In – directions of gaugings 1, 2, 3 – belts of gaugings

Piston identification

And = 8,1 mm, fashions. DR And = 4,4 mm, fashions. DS

PERFORMANCE ORDER

1. All details of shatunno-piston group are necessary for clearing and washing out gasoline. 2. To examine pistons. To measure diameter of a skirt of the piston on distance of 15 mm from a skirt bottom edge of perpendicularly axis of a piston finger. It is necessary to replace the piston, if the measured diameter differs on 0,04 mm from nominal, equal 80,98 mm. To measure a backlash in the lock of a piston ring, insert a ring into the cylinder and advance the piston, as оправкой, on distance of 15 mm from the cylinder basis. Щупом to measure a backlash in the lock. If the backlash exceeds 1,0 mm, it is necessary to replace rings. 3. To measure a lateral backlash between piston rings and flutes on the piston in several places on a circle. If the backlash exceeds 0,15 mm, replace rings or pistons. 4. Нутромером to measure diameter of cylinders, as is shown in drawing the Scheme of measurements of diameter of the cylinder. Diameter of each cylinder measure in six points, in 10 mm from a cylinder bottom edge, in 10 mm from an upper edge of the cylinder and in the middle in two perpendicular directions. If deterioration from the nominal diameter equal of 81,01 mm, exceeds 0,08 mm, to chisel cylinders under the repair size. If deterioration reaches limiting only in one cylinder, it is necessary to chisel all the same all four cylinders, differently the engine will not be отбалансирован.