Removing and installing or replacing all pistons engine BMW M52, S52, M52TU, M54, M56

11 25 530
Special tools required:
00 9 120
11 2110
11 2260
11 2470
11 3 480
11 8141

(Engine removed)

Remove cylinder head.

Removal:
Removal of pistons is described separately from installation. Assembly sequence for removal and installation is different.

A warning!
Pistons, connecting rods and bearing shells back in the same place at the same position.

Connecting rods and bearing caps marked with the same numbers in the selection of a pair and must be installed together.

Remove the oil pump.
If the oil pump and the damper oil level two separate parts:

Remove the damper oil level.
Изображение

Note:
The figure shows the position of the crankshaft without.

In engines with piston cooling nozzles in the lower part of the cylinder:

A warning!
When removing and installing pistons to follow in order not to damage the nozzles for cooling the piston.
Installation:
Thread bolts coated with anti-loosening agent. Replace screws.
Изображение

With strong oil carbon:
Carefully remove oil carbon deposits from cylinder walls.
Изображение

Remove the connecting rod bearing caps.
Изображение

Insert the rod into the tool 11 3 480.
Move with the piston rod in the direction of the cylinder head and remove the parts.
Изображение

Remove the retaining ring and press out piston pin.
A warning!

Pistons and piston pins are paired and must be fitted together.
Изображение

Setting:
Installation of pistons is described separately from removal. Assembly sequence for removal and installation is different.

The piston pin must be pushed through the bushing tap of a finger, and have no visible gap with it.
Изображение

Measure the clearance between the piston and the bore in the cylinder block.
Micrometer to measure the diameter of the piston at a distance A from the lower edge of the piston skirt and 90Aotnositelno offset in piston pin axis.
Size A.

Adjust micrometer to cylinder bore of engine block mirror bore gauge on micrometer to zero. Measure the diameter of the cylinder bottom, middle and top in the direction of movement and in the transverse direction.
The diameter of the bore of the cylinder.
The clearance between the piston and the bore in the cylinder block.
Permitted total wear clearance.
Изображение

Replace the connecting rod bearing shells.
A warning!

Pistons and piston pins are paired and must be fitted together.

Connecting rod with a piston pin to the piston so that in a state where the pair number is visible, arrow pointing to the right on the piston.
Изображение

Install the snap ring so that the hole was located in front of the recess.
Изображение

Insert the crank tool 11 in 2470.

Lightly Lubricate pistons and piston rings.
Align piston rings (offset at approx. 120Apri at this junction should not be above the bosses).

Note:

Piston diameter 84 mm:

Use special tool 11 8 141.

Piston diameter 80 mm:

Press together piston rings with special tool 11 2 260.
Изображение

Insert piston so that arrow on the head pointing towards camshaft drive.
Tightening strap should fit snugly around the cylinder surface to the perimeter.

A warning!

The danger of breakage of piston rings.

Install Only press pistons into place with finger does not drive!
Изображение

Align the crank pin and connecting rod.
Изображение

Lubricate the connecting rod bearing shells.
Install the bearing caps so that coincided number of selection in the pair.

Install new connecting rod bolts.
Изображение

Tighten the connecting rod bolts with special tool 00 9 120 or special tool 11 2 110.
Torque November 24 1AZ.
Изображение

Install the oil pump.
If the oil pump and the damper oil level two separate parts:

Set the damper oil level.

Assemble engine.
Изображение