Technical data

38
Repair instructions
2
Place dial gauge 9989876, with magnetic stand
9999696, so that the tip of the dial gauge rests upon
the edge of the valve head. Move the valve sideways
in the direction of the inlet and exhaust ports.
Read the values on the dial gauge.
Valve guides, replacement
Special tools: 6(x) series: 9991459, 9996169,
7(x) series: 9991084, 9992661.
Press out the valve guides with mandrel 9991459 6(x)
series, or 9991084 7(x) series.
1
Wear tolerances
Inlet valve, max. clearance ............... 0.33 mm
Exhaust valve, max. clearance ......... 0.38 mm
If these values are exceeded, change the valve
guides.
2
Oil the new valve guides and press them in with man-
drel 9996169, 6(x) series, or 9992661 7(x) series. The
mandrel gives the guides the correct height (23 mm
and 22 mm respectively) above the spring plane of the
cylinder head.
3
Broach the valve guides up if necessary.
Valve guides, inspection
Special tools: 9999876 and 9999696.
1
Put the cylinder head on a flat surface and put new
valves in the guides.
The valve spindles should rest on the flat surface. If
necessary, remove the injector fastening studs to get
good contact.