Putting this motor back together after replacing the rings and rebuilding injectors and have this cover left over that I can't remember where to put back in the car. (This is a w124 series 300D.)

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just a guess, but heat shield for turbo or downpipe?

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1991 300D

X2 on the heat shield. Look at the first and last pictures in this thread

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1995 E300D 316K Miles

Looks to me like the heat shield for the steering gear idler arm.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

Yeah, I think the idler arm is where it goes. Those pictures show it - thanks four the help.

Not trying to give you grief but this reminds me to always take copious photos of everything before and during disassembly. With a smart phone, there's no excuse not to.

I hate running into the same sort of head smacking event. For awhile, my daily drivers were matching '87 E30s, made two days apart. THAT was a serious luxury, I always had the other one to refer to when trying to figure out where I had gone wrong.

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1986 300SDL, 362K
1984 300D, 138K