Valve Rotator

08028-0D/H5250/94.08.12

Safety precautions:

Stopped engine

Shut-off starting air

Shut-off cooling water

Shut-off fuel oil

Shut-off cooling oil

Stopped lub. oil circul.

Description:

Dismantling, inspection and mounting of valve rotator.

Starting position:

Related procedure:

Special tools:

52005 051

Hand tools:

Small screwdriver.

Ring and open-end spanner 24 mm.

Replacement and wearing parts:

L23/30H

Inspection of Rotocap

Dirt especially in the ball pockets due to residues in the oil (abrasives, combustion products), can cause the individual parts to become stuck, and hinders the movement of the balls.

Rotocap valve rotators need no servicing under normal operating conditions.

Rotator performance is satisfactory when the valve rotates visibly and evenly.

Dismantling of Rotocap

See working card 505-01.05, point 3 to 9.

Overhaul of Rotator

1)Clean the valve rotator.

2)Inspect for wear and ball impressions.

3)Remove the retaining ring and disassemble the individual parts.

4)Replace parts showing wear grooves or depressions formed by the balls.

5)Insert the balls and the tangential springs.

Note! All balls on the inclined races of the ball pockets must point in the same direction, see fig. 1.

The inner ring of the spring washer should rest on the retainer body.

Note! Having assembled the valve rotator in dry condition it should be placed in clean lubricating oil for a short period of time.

Fig 1.

Mounting of Rotocap

See working card 505-01.05, point 3 to 9, opposite direction.

08028-0D/H5250/94.08.12

L23/30H

When to Replace the Valve Guide

If the clearance exceeds the max. limit, see page 500.35, the valve guide must be replaced.

Dismounting of Valve Guide

1) Knock the valve guide out from the bottom of the cylinder head, by means of a mandrel, which has a shoulder turning that fits into the valve guide, see fig 1.

4)Before mounting - cool down the new valve guide to approx. -70°C with nitrogen or similar.

5)Insert the valve guide into the bore.

6)Knock slightly with the mandrel and a hammer. Note! The shoulder of the valve guide must bear against the cylinder head, by knocking slightly with the mandrel and a hammer.

Valve seat ring

Mandrel

Valve guide

Fig 1.

2)Clean the bore of the cylinder head carefully.

3)Inspect for marks that can prevent mounting of new valve guide.

Fig 2.

7) Before mounting of the valve spindle insert a new O-ring in the valve guide.

Correct mounting can easily be done by the use of two valve spindles as mounting tool, one spindle to be used as support and the other spindle to be used for pushing the O-ring downwards.

Screw-drivers or other sharp tools should never be used for this purpose.

8) For mounting of valve spindle, see working card 505-01.05.

08028-0D/H5250/94.08.12