Replacing valve stem seals

Cold engine (ca. 20 °C)

Warm engine (60 °C ± 15°C)

Intake

0.10¹

0.15¹

Exhaust

0.25

0.30

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

Depressor for valve spring

110 589 04 61 00

Socket 27 mm, 1/2″ square for rotating engine

001 589 65 09 00

Impact extractor for bearing pin (basic unit)

116 589 20 33 00

Rail to hold down valve springs

110 589 00 62 00

05.2-270/1 F3

Chain tensioner holder

110 589 02 31 00

Assembly mandrel for valve stem seals intake and exhaust 9 mm dia.

Installation mandrel for exhaust valve stem seals 11 mm dia.

116 589 00 43 00

116 589 01 43 00

Magnetic lifter for valve collets

116 589 06 63 00

Valve adjusting wrench 17 mm

110 589 01 01 00

11004-7003

Remove camshaft housing with camshafts (01—470) and pertinent valve springs (05—250) to replace valve stem seals.

Valve stem seals are supplied in a repair kit with assembly sleeves.

The exhaust valve stem seal with 9 mm ID for engines starting April 1978 (emission-controlled engines start­ing model year 1980) has a holding bead inside (arrow) Do not mix up with intake valve stem seal without holding bead.

Valve guides, which are worn at the groove for the valve stem seal, must be replaced.

Repair set 123 586 03 05 (up to April 1978 or up to model year 1980 (@)).

Repair set 110 586 03 05 (starting April 1978 or starting model year 1980 (usa)).

1 Press off valve stem seals.

Don’t damage valve stem and valve guide.

05.2-270/2 F3

2   Deburr valve stem at groove (arrow).

3   Replace dented valve cones and spring retainers.

4   Check Rotocap and replace if necessary.

5 Lubricate valve stem seals and install with installa­tion mandrel.

Use assembly sleeve on intake valve.

6 Install valve springs (05—250) and camshaft hous­ing (01-470).

05.2-270/3 F3