Removal and installation of valve springs

Cold engine (ca. 20 °C)

Warm engine (60 °C ± 15°C)

Intake

0.10¹

0.15¹

Exhaust

0.25

0.30

0.05 mm more for consistent outside temperatures below —20 °C.

Nm

Rail to hold down valve springs

110 589 06 62 00

Magnetic lifter for valve collets

116 589 06 63 00

Depressor for valve spring

110 589 04 61 00

Chain tensioner holder

110 589 02 31 00

Impact extractor for bearing pin (basic unit)

116 589 20 33 00

M 6 x 50 bolt for impact extractor

116 589 01 34 00

Valve adjusting wrench 17 mm, 1/2″ square

110 589 00 01 00

Wrench socket 27 mm, 1/2″ square to turn engine

001 589 65 09 00

05.2-250/1 F3

1    Remove camshaft housing (01—470).

2   Remove pressure pads (8).

3   Unscrew spark plug of respective cylinder and set piston to ignition TDC to prevent valves from dropping in.

05.2-250/2 F3

4 Bolt hold-down rail to cylinder head.

5 Support valves with pneumatic air (cylinder leak tester).

6   Loosen valve collets by applying light knocks from a hammer to valve spring retainers.

7   Press down valve spring retainer with removal and installation tool and remove valve collets with magnet­ic lifter.

Valves must not rest on piston skirt, since this could bend the valves.

8   Remove valve spring retainer, outer and inner valve springs.

9   Check valve springs and replace if necessary (05— 260).

10    Replace valve stem seals (05-270).

11    Further installation in reverse sequence of remo­val.

Install valve springs that tighter coil ends rest on roto-cap.

Valves and rocker arms

05.2-250/3 F2