[vr2whf]

Should I apply the thread sealant (such as loctite blue) when put back the differential oil plug?

And, I notice that both W210 and W203 plug torque spec is 50Nm.

 

[Check Codes]

Definitely not.

It's a pipe thread (tapered), so no sealant.

Some recommend a layer or two of teflon tape, helps make it easier to remove the next time.

Remember to remove the fill plug before you remove the drain plug.

Good luck.

 

[vr2whf]

Thanks! Check codes.

Removing the fill plug first will make removing the drain plug easier? This is my first time ever on the diff.

I only handled the engine oil, tranny oil, coolant, washer fluid before.

Definitely not.

It's a pipe thread (tapered), so no sealant.

Some recommend a layer or two of teflon tape, helps make it easier to remove the next time.

Remember to remove the fill plug before you remove the drain plug.

Good luck.

 

[nugent]

Remove the fill plug first, because if you do the drain first, and find that the fill cannot come off, you have a problem.

 

[Kajtek1]

Teflon dope, find in Home Depot plumbing is better than tape on several fronts.
It will not end floating inside the case to start.
Notice the relatively low torque for big plug. Lot of mechanics like to overtorque them and you need really long bar to break them loose.

 

[vr2whf]

I see. Wonder if anyone cannot actually remove the plug for some reason? Any experience to share?

Remove the fill plug first, because if you do the drain first, and find that the fill cannot come off, you have a problem.

 

[vr2whf]

Thanks for your advise. I have a 24" breaker bar ready.

Teflon dope, find in Home Depot plumbing is better than tape on several fronts.
It will not end floating inside the case to start.
Notice the relatively low torque for big plug. Lot of mechanics like to overtorque them and you need really long bar to break them loose.

 

[Check Codes]

I see. Wonder if anyone cannot actually remove the plug for some reason? Any experience to share?

I don't know of anyone who was ultimately unsuccessful. There have been some who gave up on it as a DIY because it was "too tight" and they didn't want to damage anything, so they took it to have it done; it came out, it just wasn't their doing...or undoing.

I think since the drain plug is bathed in oil it doesn't "seize" like the fill plug can. I recall that my fill plug took quite a bit more effort to loosen than did the drain plug, and I was the first one to ever remove either one. I'm assuming the same torque was used at the factory to tighten each of them.

 

[vr2whf]

Would it be sensible to spray some PB or WD40 at the fill plug to make it easier to remove?

 

[vr2whf]

I just notice G-AMG applied a drop of omnifit 100h sealant to the thread of the plug.

http://www.benzworld.org/forums/w21...ar-differential-oil-change-4.html#post5237244

Definitely not.

It's a pipe thread (tapered), so no sealant.

Some recommend a layer or two of teflon tape, helps make it easier to remove the next time.

Remember to remove the fill plug before you remove the drain plug.

Good luck.

 

[Simon_E]

Because I also followed the instructions by G-AMG when I exchanged the differential fluid, I also used some thread locker. I believe it was the blue loctite. If one thinks about it, it is probably superfluous, as Check Codes points out. On the other hand, if applied sparingly and correctly, it should not do any harm, neither should it affect the breakaway torque much.

 

[Check Codes]

Would it be sensible to spray some PB or WD40 at the fill plug to make it easier to remove?

Only if there is lots of rust on the surface.

It's a pipe thread. There's no place for it to penetrate.