Valve Guide Seal: Service and Repair

Valve stem oil seals, replacing

^ Cylinder head installed

Special tools and equipment
^ VW653/3 pressure hose
^ 3122B spark plug removal tool
^ 3362 valve spring tool and 3362/1 pressure piece
^ 3364 valve seat tool
^ 3365 valve stem seat fitting tool

Removing
^ Remove camshafts and hydraulic chain tensioner, Refer to Camshaft, Engine , Service and Repair.
^ Remove valve lifters and lay aside with camshaft contact surface facing down. Be careful not to interchange valve lifters.
^ Using 3122B spark plug removal tool, remove all spark plugs.
^ Move piston for individual cylinder to Bottom Dead Center (BDC) position.
^ Thread VW653/3 pressure hose into spark plug hole.

Note: Lightly tap valve spring retainer to loosen stuck valve keepers.





Intake and exhaust valves have different installation angles in cylinder head. 3362 valve spring tool can be used in two different positions:
1 - Top position for the center intake valve
2 - Lower position for both outer intake valves and both exhaust valves
3 - Threaded bores with M6 x 25 retaining bolts on the left and right are used to secure the lower bracket to cylinder head





^ Using retaining bolts bolted into tool, secure 3362 valve spring tool to cylinder head.
^ Adjust tool to correct position for corresponding valve.
^ Attach pressure hose to compressor.
Minimum pressure: 6 bar (87 psi)
^ Using threaded spindle and 3362/1 pressure piece, press valve springs downward and remove.





^ Using 3364 valve seat tool, remove valve stem oil seals.

Installing





^ Place plastic sleeve -A- on valve stem to prevent damage to new valve stem oil seals.
^ Lightly oil lip of valve stem oil seal -B-.
^ Insert valve stem oil seal into 3365 valve stem seal fitting tool and carefully slide onto valve guide.
^ Remove plastic sleeve.
^ Install camshafts.

CAUTION!
^ After installing the camshafts, the engine must not be started for approximately 30 minutes. The hydraulic valve lifters have to settle (otherwise valves will strike the pistons).
^ After installing the valvetrain and lifters, carefully rotate the crankshaft by hand at least 2 full revolutions before starting to be sure that valves do not strike the pistons.