190SL King Pin Tech Tip

This is how I do it. If anyone has a better way or suggestions, please comment.

[@mercedesmaintenance.6339]

Thanks for taking the time to make this. You're assembly procedure makes a lot sense. I've heard of some that fight with alignment of the upper and lower pins/trunions. Cheers John 🍻

[@Mercedes-Guru]

Hey John, thanks for the nice comment.

[@belesimobelesimo3191]

Very nice Will! Thank you

[@Mercedes-Guru]

Thank you for viewing and for your kind message.

[@stephaneloret3427]

Hi Wil, I have a question for you : I can’t figure why there is 2 différent size (30 and 31) on the A arm assy bolt. Why did they do that ?

[@Mercedes-Guru]

Excellent question. To quote from the workshop manual "For reasons of manufacture, both the upper and the lower control arm have been given 2 different threads, the one M 30 x 2 and the other, M 31 x 2. In order to distinguish between these two, the figure "31" has been stamped at the side of the eye of the control arm which has the M 31 thread and a groove has been machined in front of the thread in the threaded bushing which has the M 31 thread." So not only do they have to make 2 different threads in the A arms, they have to make 2 different threaded bushings, they have to stamp 31 on one side of the A arm and they also have to machine a groove in one of the bushings. That is a ton of extra work. My short answer is full employment for engineers. Everyone has a job, even if it is busy work. What I would like to know is what is meant by "for reasons of manufacture"? As we know, Detroit would have simplified this process to 2 stamping operations with total interchangeability of parts. If anyone has an answer to your question I am ready to hear it.