Valve Spring: Service and Repair

NOTE: This same method can also be used for the replacement of valve springs, valve caps or collets.





REMOVAL
1. Remove the intake manifold, the valve covers and the camshafts.

NOTE: Store all disassembled valve parts in valve stand 83 93 787, or equivalent so that they do not become mixed.

2. Lift out the tappets with tool 83 91 401, or equivalent.
3. Install plastic sleeves 83 95 022, or equivalent around the valve springs to protect the sealing surfaces of the tappets.
4. Turn the crankshaft so that the piston in the cylinder is at its TDC position. Lock the engine using flywheel stop 83 94 868, or equivalent unscrew the spark plug from the cylinder and install air nipple 83 94 173, or equivalent. Connect compressed air and place piston and valves under pressure.
5. Hold removal tool 83 94 181, or equivalent against the valve head and in line with the valve stem. Strike the tool smartly with a hammer. This should free the collets from the valve and they will then be collected in the tool as it is removed.
6. Lift out the spring cap and valve spring . Remove the valve stem seal using pliers 83 94 157, or equivalent.





INSTALLATION
1. Install the seal to the valve. Use tool 83 95 071. Use a plastic mallet to tap the seal carefully into position.
2. Install the spring and spring cap and position the collets in the groove in the spring cap.
3. Carefully tap the collets home using a hammer, installing tool 83 94181 and sleeve 83 94 207, or equivalent. Disconnect the compressed air, remove the compressed-air adaptor and the flywheel locking attachment. Install the spark plugs and tighten to 25 Nm (18.5 ft. lbs.).
4. Remove the plastic sleeves Benefit the tappets.
5. Turn the crankshaft to 60° BTDC and install the camshafts, the valve covers and the intake manifolds. Set the valve timings.