450 SL oil cooler

Hello all,

I’m about to exchange the oil cooler on my ‘72 450 SL (US) with another genuine unit. It is attached to the radiator with two bolts - but not ordinary bolts. Rather they have a round head (ref. enclosed picture). I cannot see a corresponding nut on the backside. Anybody know how to get these fittings loose? Is there perhaps a small clip between the small bracket and the radiator? Difficult to see. I have not yet loosened the fan scroud.

best, Peter

Hi Peter,

from my memory: There should be 2 nuts under scroud. You have to remove that first. Then spray screws and nuts well with with rust solvant. Srew sits in a square hole in cooler.

Hi Peter,
the oil cooler is screwed in place with two M6 carriage bolts, with the watercoller together from otherside you find M6 Nuts not clips .

Hi Volker and Igor,

You are absolutely correct. I checked with some light and could clearly see the two small nuts on the other side, facing forward. At least the upper nut looks like a tight fit but a small wrench ought to do the trick.

Br. Peter