Checking pistons and cylinder bores

Printed in Germany - XXVII, 1991

PISTON ARRANGEMENT - 1980/1981/1982/1983 Models

Hho Dry Cell Austria

Engine M 28/13 and M 28/14 M 28/19 and M 28/20 USA, Canada, Japan Compression ratio 9 : 1 95 mm diameter (M 28/13, M 28/14) 97 mm diameter (M 28/19, M 28/20)

Engine M 28/11 and M 28/12

Europe and Rest of World Compression ratio 10:1 97 mm diameter

Engine M 28/09 and M 28/10

Europe and Rest of World Compression ratio 10 1 95 mm diameter

Piston Weight Tolerances

Since 1980 models pistons and piston pins are paired according to weight. Pistons are weighed with components (piston pins, piston rings, cir-clips).

Piston pins must always remain in the corresponding pistons and must not be mixed up within a set of pistons for one engine. This is important when disassembling and assembling an engine and pistons must be marked if necessary.

If pistons and pins are mixed up, they must be rearranged by checking the total weight.

Weight = 722 g Permissible tolerance = £ 4 g

Printed in Germany - XII, 1986

Piston Arrangement

13 24 a

PISTON SIZES, 84/85/86 MODELS ONWARD

Engine M 28. 21/22, Europe and all other countries, compression ratio 10.4 : 1

Nominal diameter - 97.0 mm

Engine M 28. 21/22, Sweden, Switzerland and Australia, compression ratio 9.3 : 1

Nominal diameter - 97.0 mm

{32-VALVE ENGINES) Engine M 28. 43/44 USA, Canada and Japan, Compression ratio 10.0 : 1 Nominal diameter - 100.0 mm

Engine M 28. 45/46 Australia, Germany, Austria and Switzerland, Compression 9.3 : 1 Nominal diameter 100.0 mm

NOTES FOR INSTALLING PISTONS PISTONS, 87 MODELS ONWARD

(32-VALVE ENGINES)

inscribed on the base of the piston indicates the installation position (arrow toward exhaust side). When pre-assembling pistons, check that the connecting rods are in the correct installation position.

Note:

Modifed installation position for pistons as of engine numbers:

M 28.43 as of 81 G 00594 - 00622 M 28.44 as of 81 G 06311 - 06378

The valve cutouts for the valves are of equal size on both sides. The installation position is indicated by an arrow which points toward the belt pulley.

M 28, 41/42 engines, worldwide Compression ratio: 10.0 : 1 Nominal dia. 100.00 mm

The valve cutouts for the valves are the same size on both sides. The installation position is indicated by an arrow which points toward the belt pulley.

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