49
Repair Instructions
Valve guides, inspection
Special tools: 999 9683, 999 9696
1
Position the cylinder head on a pair of wooden blocks
and install new valves in the guides.
Lower the valve approximately 2 mm and check wear.
2
Position the rocker dial indicator 999 9683 with mag-
netic holder 999 9696 so that the dial indicator gauge
point is against the valve stem. Move the valve side-
ways in the direction of the exhaust and intake ports.
Read off the value of the indicator gauge.
Permissible values see “Workshop manual, technical
data”.
Valve guides, replacing
Special tools: 31/32/41/42/43 series: 884 992, 999
5218, 999 5028
44/300 series: 885 238, 885 261
1
Press out the valve guide with drifts 999 5218 (31/32/
41/42/43 series) and 885 261 (44/300 series).
2
31/32/41/42/43 series:
Lubricate the new guides and press them in with drift
999 5028. The drift gives the guides the correct
height (A= 18 mm) above the cylinder head spring
level.
44/300 series
Position the cylinder head upside down on a flat sur-
face. Lubricate the new guides and press them in with
drift 885 261. Press until guides bottom out against
the surface underneath.
3
Ream valve guides if necessary.
NOTE! Valve seats must be ground after replacing
guides.
