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

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

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: Identifying Piston Pin Pressed Through Liner

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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.

Measuring point A.

Fig 2: Measuring Piston Diameter With Micrometer At Measuring Point A From Bottom Edge Of Piston

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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

Courtesy 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 Visible Pair Numbers

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Install retaining ring.

Fig 5: Installing Retaining Ring

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Install special tool 11 2 470 in conrod.

Fig 6: Installing Special Tool 11 2 470 In Conrod

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