Nice work, thanks for posting the pics.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

I used the same MasterCool AC ferrule crimper when I re-hosed the oil cooler lines on my 1984 300D. I used AC barrier hose, which is rated for hot oil and much higher pressure. No leaks in ~5 years. The OE hose had been hacksawed by the p.s. belt, due to sagged motor mounts. I cut the new upper hose 1" longer to better clear that belt. Amazing M-B never thought of that.

I'm surprised that a 240D even needs an external oil cooler since even classic V-8 U.S. engines don't. I assumed it was needed for the turbo engines since they have oil squirter coolers under the pistons. My 2002 Chrysler 3.8L minivan has an oil cooler, a simple pancake between filter and block which routes thru engine coolant, so your first idea of using the radiator transmission cooler "should work". Ours has the factory tow-package and AWD, which adds that oil cooler and p.s. cooler.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Agreed. Car is in heated garage, no worries on freezing. Planning on running errands through the weekend, then the flush and G05 fill.
This car suffered similarly, old hose wounded by p/s belt due to mounts. Mounts were relatively new when I got it, but historical documents show me replacements point-in-time. I'm surprised this needed the cooler too, and more so with this latest service part oil t-stat, slightly higher temps. I guess hot climates might have needed it, so the a/c combo plus homologating to the US market that has hot zones made their decision for them. As far as classic V-8s go, Caddy HT4100 and Olds Diesels had oil coolers on them. I've got a few Olds diesel powered land barges.

I also did a vacuum pump while I was in that far, found a NORS model made by same mfr of OE, felt nice and solid. The holy trinity of catastrophes now averted for the time-being, reinforced rad upper inlet, oil cooler hoses, and vacuum pump all fresh. Someone had already done the front seal, didn't realize that until I popped the damper off, did it anyway, along with that bastard of a seal race. Timing chain is nice and tight. Oil changes beyond counting in the records I have going back to day 1 on this car. Crankcase is pristine. Coolant...not so much.

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1983 240D 4-speed manual

probably already mentioned but…
a heat exchanger in lieu of the cooler
The transmission cooler on a radiator for A/Ts

Good you finally found a good Oil Cooler.

Here is a good thread of fixing the OC nipples when stripped off, from 11 years back.
Couple links in there also to click on.

https://www.peachparts.com/shopforum/diesel-discussion/333912-oil-cooler-nipple-fitting-weld.html


Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works