MTU Detroit Diesel 183 Series Technical Publication page 331

Task Description
20080/1 E 98-12
Install drive gear (5) on drive flange.
Note
Do not fully tighten hex screws (7).
Turn injection pump camshaft until mark on drive flange
is aligned with mark on injection pump (arrow).
Move injection pump drive gear to central position in
elongated holes.
Replace O-ring (9) for injection pump oil pressure duct.
Place injection pump in bearings on crankcase. Make
sure the injection pump markings are aligned. The drive
gear must engage tension-free in the injection timer
splines.
Group 07
Subgroup 8410
Page 7