46
Repair Instructions
Guide pin, valve yoke, change
(only KA(M)D44/300)
The guide pin should only be changed in cases where
the guide pin has been broken. Since this task requi-
res great accuracy, we recommend that the cylinder
head should be removed from the engine before work
starts.
1
Make a center punch mark in the center of the guide
pin. Be very careful to center the center punch mark.
2
Drill with a 3.2 mm (0.125984") hole (1). Drilling depth
about 10 mm (0.3937") , or when the case hardened
layer of the guide pin is reached. Use a pillar drill.
Thread the hole with an M4 tap (2).
3
Screw in a stud (M4), slide a spacer sleeve over, plus
a suitably sized washer. Pull the guide pin up by scre-
wing the nut down.
4
Inspect and clean the hole for the guide pin.
5
Press the new guide pin in with a suitable mandrel.
Press until the guide pin projects 28 mm (1.10236")
above the cylinder head plane.
