I was replacing the trans mount and carrier mount on my 1985 w123 300D and I found that the threads on the 2 bolts holding both of these parts were pretty smashed together as well as a pain to remove. For temporary, I installed same length, size, and thread pitch Lowe's hex cap bolts with lock & regular washers without difficulty. Any real danger just leaving these on the car? I looked online for torque values on regular 8.8 m10x1.25 bolts and their max torque value appears to be ~18ftlbs. Also, for the life of me I cant find the Mercedes torque values for flex discs, diff mount, trans mount, trans sub-frame, and carrier mount bolts. Anybody out there know the values?

Should not be a problem as long as your replacement fasteners were at least grade 5 or grade 8.

"Grades" are applicable to SAE fasteners, not metric.

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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx

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84 300D, 82 Volvo 244Gl Diesel

Correct, should have stated a minimum of metric 8.8.

Here a some of the torque values you're looking for


Jeff

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1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end