11 25 530 Removing and installing or replacing all pistons (M52 / S52 / M52TU / M54 / M56): Removal:
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Removal of pistons is described separately from installation. Assembly sequence for removal and installation is different.
IMPORTANT:
Re-install piston, connecting rod and bearing shells back in the same position and in the same installation location. Connecting rods and bearing covers are designated with the same pair number: do not mix them.
Remove oil pump. Refer to 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (M52TU / M54 / M56) .
If oil pump and oil scraper are two parts: Remove oil scraper.
NOTE:
Figure shows crankshaft removed.
On engines with spray nozzles for piston cooling on cylinder underside:
IMPORTANT:
When removing and installing pistons, make sure the piston cooling spray nozzles are not damaged.
Installation:
Screw threads are coated with screw securing adhesive (Loctite). Replace screws.
In event of heavy oil carbon residue:
Carefully remove oil carbon residue from cylinder wall.
Unscrew connecting rod bearing cover.
Insert special tool 11 3 480 in connecting rod.
Remove connecting rod with piston from cylinder head side.
Lift out retaining ring and press out piston pin.
IMPORTANT:
Piston and piston pin are paired and must not be fitted individually.