11 25 671 Replacing piston rings of all pistons (N47)

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Necessary preliminary tasks:

Remove PISTONS .

Remove all piston rings (2) with piston ring pliers (1).

NOTE: It might not be possible to find the identification on used piston rings.
Put aside piston rings in correct sequence and installation position.

Fig 1: Removing Piston Rings With Pliers

G09920753

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Piston rings with "TOP" identification must point to piston crown.

Plain rectangular compression ring
Piston ring
Bevelled roof ring with spiral expander

Arrange piston ring contact points with offset of approx. 120° to one another, but not over gudgeon pin boss.

Fig 2: Compression Ring And Piston Rings

G06852885

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Marking (TOP) must point towards piston crown.

The oil scraper ring has no identification marking and can be installed in any position.

Fig 3: Oil Scraper Ring Marking

G09920755

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust piston rings to 120 degree position.

Fig 4: Piston Rings Position

G05501829

Courtesy of BMW OF NORTH AMERICA, INC.

Measure side clearance.

REFER TO TECHNICAL DATA .

Fig 5: Measuring Piston Rings Side Clearance

G04739784

Courtesy of BMW OF NORTH AMERICA, INC.

Measure end clearance.

Refer to Technical Data . See PISTONS WITH RINGS AND PINS and PISTON AND PIN .

Fig 6: Measuring Piston Rings End Clearance

G04739786

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.