Replacement bolts are indeed Torx. PITA to find a tool that fits in the available space; you end up buying a whole set for one driver. Last visit to the junkyard I robbed a few cars of their hex-head bolts for my spares kit; hopefully I'll have enough to last a lifetime (mine and the car's).

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Its in and sounds like a truck!! That was actually a lot easier on the 606 than the 603. The trick is undo the rad support and voila plenty of room to work with and thankfully no vicious radiator cuts. 8mm allen with a cheater pipe, pulley holder and room to spare made this R&R a breeze. I think it took about 40 minutes, not counting a phone call and fixing some other things.

Now, I have hopes this will also help the AC work better by keeping the coolant temps in check. I noticed the AC seems to be definitely not as cold at around 90C vs 80C. Interestingly, temps never got above that w/o a good fan clutch even in stop and go city traffic.

Well ready for summer anyway.

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Treetops
06 E320 CDI 127K Miles
87 300TD 231K Miles

99 E300 269K Miles-Sold

You cannot use a hex wrench there is not enough room. I used an 8mm viking socket a 1/4" breaker bar with a deep socket in 3/8" extension. Just barely enough room to get the socket in. You can cut off a hex wrench but unless you do it is too long. Make sure the hex is all the way in the bolt is very soft and easy to bugger up. I threw mine away and bought a hard bolt to replace it.