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Home >> BMW >> 2003 >> X5 30i, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 27 (Engine - Repair Instructions - X5 (4.6L)) >> Piston With Rings >> 11 25 530 Removing and installing/replacing all pistons (M62) >> Installation

11 25 530 Removing and installing/replacing all pistons (M62): Installation

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Piston and piston bolts are paired and must not be fitted individually.

Installation of pistons is described separately from removal. The assembly sequence for removal and installation is different.

If necessary, replace connecting rods.

NOTE: The conrods can also be replaced individually.

The piston pin must be able to be pressed through the liner by hand with little force and must not display any significant play.

Fig 1: Testing Piston Pin Fit
G03254621Courtesy of BMW OF NORTH AMERICA, INC.

Before installation, measure piston installation clearance.

Measure piston diameter with micrometer at measuring point A from bottom edge of piston and offset at 90° to the axis of the piston pin.

Fig 2: Measuring Piston Diameter
G03254622Courtesy of BMW OF NORTH AMERICA, INC.

For Measuring Point A, refer to PISTONS WITH RINGS AND PINS .

Adjust micrometer to cylinder bore of engine block, set internal caliper on micrometer to zero. Measure bottom, center and top of cylinder bore in direction of travel and direction of engine rotation.

Diameter of cylinder bore.

Piston installation clearance.

Total permissible wear tolerance.

Fig 3: Measuring Cylinder Bore
G03254623Courtesy of BMW OF NORTH AMERICA, INC.

Install conrod bearing.

IMPORTANT: Piston and piston bolts are paired and must not be fitted individually.

Fit conrod with piston pin to piston in such a way that both of the visible pair numbers on the installation direction arrow on the piston point to the right.

Fig 4: Identifying Connecting Rod Numbers
G03254624Courtesy of BMW OF NORTH AMERICA, INC.

Install retaining ring.

Fig 5: Installing Piston Pin Retaining Ring
G03254625Courtesy of BMW OF NORTH AMERICA, INC.

Install special tool 11 2 470 in conrod.

Fig 6: Installing Special Tool To Conrod
G03254626Courtesy of BMW OF NORTH AMERICA, INC.

M62 B46 only: 

Lightly coat pistons and piston rings with oil.

Align contact points of piston rings (offset at approx. 120°, but not over piston pin lug).

Compress piston rings with special tool 11 9 500.

Fig 7: Compressing Piston Rings
G03254627Courtesy of BMW OF NORTH AMERICA, INC.

Keep piston rings compressed with special tool 11 9 500.

Install piston so that arrow points to camshaft drive.

IMPORTANT: Danger of piston ring failure.
Press in piston only with finger force (do not knock in!).

Attach crankpin to connecting rod.

Fig 8: Attaching Crankpin To Connecting Rod
G03254630Courtesy of BMW OF NORTH AMERICA, INC.

Apply light coat of oil to connecting-rod bearing shells.

Fit bearing caps so that pair numbers match up.

Fig 9: Identifying Connecting Rod Pair Numbers
G03254631Courtesy of BMW OF NORTH AMERICA, INC.

Install new conrod bolts.

Tighten down conrod bearing with special tool 00 9 120 or with special tool 11 2 110.

Fig 10: Tightening Conrod Bearing Caps
G03254632Courtesy of BMW OF NORTH AMERICA, INC.

Tightening Torque,

refer to 11 24 1AZ in ENGINE - TIGHTENING TORQUES - X5 4.6L .

Install spray nozzle and tighten down screw.

Fig 11: Installing Spray Nozzle
G03254633Courtesy of BMW OF NORTH AMERICA, INC.
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