Based on my files, the service bulletins referred to for the "racka-racka" syndrome typically encountered on cold start up are as follows:

AF05.00-U-1300AG and AF05.20-P-1400EG

AF05.00-U-1300A:
The first refers to the oil passage tubes which if they fail can cause a ticking lifter noise. This will typically be noticeable hot or cold. They get brittle and fail with age. I would spend the $160 for the parts (I think its 8 per head for a total of 16 at about $10 ea.) while I was in there and be done with it.

AF05.20-P-1400EG:
The second refers to the oil filter return valve. Fault is described as short loud rattling noise audible during cold start only on left or rigt side in the camshaft adjuster. It can be heard from inside the car, but is impossible to ignore if you crank the car with the hood up. The correction is posted in Procedure 18-1100 (RA1823-1100 pages 1-6 (housing removal) and Procedure 18-1120 (RA18.1323-1120 page 1 (check valve removal) The part no. for the early 92 models should be 119.184.01.30 and requires gasket replacement part no. 119.184.02.80 and you may wish to replace the rubber plug no. 116.187.00.55 (see figure shown on page RA.1322-1120/1) the rubber plug is behind the hex head plug/screw for the lower tube which has no part no. shown. The screw is part #000908014008. Note the screw and the rubber plug are shown on the dealership digram

DiamlerChrysler AG - Electronic Parts Catalogue (EPC)
119.974/18/045/B18045000123 Engine Lubrication/Oil Filter page ? Pcterm30?
as part no. 41 (rubber plug 116.187.00.55)
and part no. 44 (metal screw plug 000908014008)

The oil pump check valve replacement is procedure 18-2150 but I do not have a bulletin number for it.

Good Luck.

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dwight