Valve guide sealing rings
Position the cylinder head on the appropriate support
88713.2103.
Use denatured alcohol to lubricate the valve guide sealing rings (14) and insert them from the spring side onto tool (L) no.
88713.2442.
Fit the end of the tool into the valve guide and use a hammer to tap the sealing rings (14) home into the valve guides.
Reassembling the closing rocker arms
Check that the rocker arms are not scored or show signs of breakage in the area of contact with the camshaft and shim.
The closing rocker arm shafts (17) feature a 10 mm diameter, whereas the opening rocker arm shafts (13) feature a 9 mm diameter.
Using an M6 screw, position the closing rocker shaft (17) towards the exhaust side of the cylinder head.
Insert the new split rings (8) in the valve groove (T) and release the rocker arm to correctly position shim (7).
Turn the closing rocker arm (5), and compress the spring as much as possible while holding valve, shim and split rings in
the valve closed position.
Release the rocker arm with a quick movement, so that the split rings seat in the shim.