Valve Stem Seals, Removing And Installing: Procedure
Vehicles with Ceramic Glow Plugs:
- Ceramic glow plugs are very sensitive because of the materials they are made with. They require special handling when assembling and disassembling. Always follow the procedures described when removing and installing. Refer to GLOW PLUG SYSTEM .
Vehicles with Metal Glow Plugs:
-- Remove the glow plugs with the Glow Plug Socket:3220 .
Continuation for All Vehicles:
-- Remove the camshafts. Refer to CAMSHAFTS, REMOVING AND INSTALLING .
-- Position the Valve Cotter Tool Kit - Guide Plate 23:VAS5161/23 on the cylinder head.
-- Secure guide plate with Valve Keeper Tool Kit - Knurled Thumb Screws 12:VAS5161A/12 .
-- Insert the Valve Cotter Tool Update Kit Punch 3A:VAS5161/30 into the guide plate and loosen the valve retainers with a plastic mallet.
-- Install the Valve Keeper Tool Kit Compression Stud:VAS5161/10 in the Guide Plate.
-- Install the Valve Keeper Tool Kit Adapter for Compressed Air Connection:VAS5161/11 in the glow plug threads and tighten by hand.
-- Screw engaging device Valve Cotter Tool Kit - Retainer:VAS5161/6 with installation fork Valve Cotter Tool Kit - Guide Forks M6/M8 Threaded:VAS5161/5 into Guide Plate.
-- Slide the Valve Cotter Tool Kit - Guide Plate 23 Sleeve:VAS5161/23-1 on the Valve Cotter Tool Update Kit assembly cartridge VAS5161/8A:VAS5161/30 .
-- Connect the Adapter to compressed air with a commercially available connector and apply constant pressure.
- Minimum pressure: 6 bar (87 psi)
-- Engage Pressure Fork:VAS5161/2 at Engaging Device and press down Installation Cartridge.
-- At the same time, turn knurled bolt of installation cartridge to the right, until the points engage in the valve retainers.
-- Lightly move knurled bolt back and forth, causing the valve retainers to be pressed apart and be captured in the installation cartridge.
-- Release pressure fork.
-- Remove the installation cartridge with the spacer ring, the valve plate and the valve spring.
-- Pull off valve stem seals using the Puller - Valve Seal:3364 .
If the Puller - Valve Seal:3364 cannot be used on some valve stem seals due to restricted clearance, proceed as follows.
-- Drive the tensioning pin -arrow- on the Valve Seal Removal Tool:3364 out with a drift and remove the impact puller attachment.
-- Place the lower section of the Valve Seal Removal Tool:3364 on the valve stem seal.
-- Secure the valve stem seal puller with a drift or cotter pin driver -1- as illustrated.
-- Position a puller on the valve stem seal puller and remove the seal in direction of -arrow-.
A plastic sleeve -A- is supplied with the new valve shaft seals.
-- Place plastic sleeve -A- on valve stem to prevent damage to new valve stem seals -B-.
-- Lightly coat sealing lips of valve stem seal with oil.
-- Push valve stem seal onto plastic sleeve.
-- Carefully press valve stem seal onto valve guide using Seal Installer - Valve Stem:3365 .
-- Remove plastic sleeve again.
-- If the valve retainers were removed from the installation cartridge, they must then be inserted into the Valve Keeper Tool Kit Valve Insertion Device:VAS5161/18 .
The large diameter of the valve retainers point upward.
-- Press the installation cartridge onto the insertion tool from above and remove the valve retainers.
-- Insert the Valve Keeper Tool Kit Assembly Cartridge:VAS5161/8 in the Guide Plate.
-- Press the pressure fork down and pull the knurled bolt upward while turning it left and right to insert the valve retainers.
-- Release Pressure Fork with the knurled bolt still pulled.
Assemble in reverse order of disassembling. Note the following:
-- Install the glow plugs. Refer to GLOW PLUG SYSTEM .
-- Install camshafts. Refer to CAMSHAFTS, REMOVING AND INSTALLING .
After installing camshafts, do not crank engine for at least 30 minutes. The hydraulic adjusting elements must seat themselves (otherwise the valves will seat themselves on the pistons).
After working on the valvetrain and lifters, carefully rotate the crankshaft by hand at least two full revolutions before starting to be sure that valves do not strike the pistons.