Piston, Engine

Diameter Specifications






Cylinder-to-piston clearance 0.02 - 0.03

Piston Identification





The following marks are stamped on the upper piston crown section (installation position):

Letter "E" in the middle (towards inlet), with change level ID (internal Mahle ID) to the right; the tolerance group (0, 1, 2, 3) is indicated to the left of the "E", and the weight class is indicated next to the tolerance group.

NOTE: The signs - - (minus minus) to indicate the weight group may also appear in vertical direction.


Weight Specifications
The weight of the pistons has been changed for technical reasons. The new pistons are lighter. If it is necessary to replace individual pistons and cylinders during repair work, first check which pistons are installed.

The marks on the piston can be inspected by using a steel brush to remove deposits. Otherwise, the pistons must be weighed!

Distinguishing Features:





Old ,heavy" piston
Stamp on piston crown: 11/0

New,light" piston
Stamp on piston crown: 24/0

Only the new ,light" pistons are now available.

Compensating For Weight Differences
The new and the old pistons can be installed in the same engine. However, the weight difference must be compensated.

Compensation is effected by installing a 14 g heavier replacement piston pin (dimensions 23 x 11 x 54).

To install the piston pin, special tool pressure piece 9500/4, order no. 000 721 950 04, must be used.

Weight Classes For "Heavy" Pistons





Weight classes for Mahle pistons
Pistons weighed complete with fittings (piston pins, piston rings, snap ring)






Weight Classes For "Light" Pistons