micro-encapsulated screws?
 

What is the deal with these screws?

I'm planning on changing the window regulator in my 1994 E320 and it says I should replace the screws.

The local dealer said they had no idea what I was talking about????

Please help.

Thanks.

Re: micro-encapsulated screws?
 

What or who is IT?

And are you replacing the front or rear regulator?

Not that it matters, but usually, replacement involves the whole assembly.

Some parts can be purchased seperately, especially the plastic track mechanism that the window rides on.

I have replaced both rears, but aside from the three 10mm bolts that hold the assembly to the door shell, I have not run across the "screws" you are referring to...

microencapsulated is fancy Locktite.

jbaj007 is right.

The "micro-encapsulated screws" are factory bolts that have on them, a Loctite type of chemical (usually blue) that prevents bolts from getting loose in high vibration and shock applications. Why this instead of say a lock-washer? Because there is a greater surface area of resistance with the chemical than a lock-washer.

The micro-encapsulation really just means that little tiny droplets of the "Loctite" type chemical is applied to the bolt. When the bolt is threaded into its respective nut or piece, the little droplets burst and chemically attach to the bolt's threads and to the respective attached piece. It is my understanding that this actually occurs at the microscopic grain level of the metals.

I have seen them used in window regulators and bolts mounting brake calipers. Non-wet applications: no oil, fuel or coolant.

The idea is once used, they should be replaced. I have found that using them again with a small dab of Locktite seems to rejuvenate the "micro-encapsulated" chemical.

My 2 cents

thank you
 

Many thanks everyone!

"IT" was the service CD. Sorry I was vague.

I'm changing the front driver's side regulator.

I rolled the window up, and now it is stuck up.

I heard a poping noise like something broke inside the door.

Now I only hear the motor going, but I don't see the window moving.

Thanks for the help.