Oh ... dear ... motor mount bolt busticated - Page 2 - PeachParts Mercedes-Benz Forum

280EZRider · #16 12-04-2009, 08:11 PM

Torque for that bolt is 75 nm. Using a breaker bar, you probably doubled that torque.

t walgamuth · #17 12-04-2009, 11:09 PM

I strongly would advise against trying the easy out. They usually break off and they are too hard to drill out easily.

Stick with a drill or left hand drill. If you cannot save the threads you can through bolt it fairly easily, IIRC.

Crazy_Nate · #18 12-04-2009, 11:18 PM

Quote:

Originally Posted by 280EZRider

Torque for that bolt is 75 nm. Using a breaker bar, you probably doubled that torque.

Aha! Just in time for me to do my mounts

I was wondering what it would be roughly

BodhiBenz1987 · #19 12-04-2009, 11:34 PM

Quote:

Originally Posted by t walgamuth

Stick with a drill or left hand drill. If you cannot save the threads you can through bolt it fairly easily, IIRC.

Forgive my ignorance, but what does this mean exactly?

pawoSD · #20 12-05-2009, 12:08 AM

Left hand drill bit works counterclockwise to drill a hole vs. clockwise for normal bits. So the mere action of using a "reverse" bit might back out the remaining piece of the bolt.

BodhiBenz1987 · #21 12-05-2009, 12:16 AM

Quote:

Originally Posted by pawoSD

Left hand drill bit works counterclockwise to drill a hole vs. clockwise for normal bits. So the mere action of using a "reverse" bit might back out the remaining piece of the bolt.

Got it ... thanks. Hopefully my dad has such drill bits somewhere. I have one piddly (but nice) set of regular bits.

Diesel911 · #22 12-05-2009, 12:19 AM

"If you cannot save the threads you can through bolt it fairly easily, IIRC."

I think the above means that as one of the members did; he drilled completely trough the arm and installed a long bolt through the hole with a Nut on the other end.

pawoSD · #23 12-05-2009, 12:32 AM

Quote:

Originally Posted by Diesel911

"If you cannot save the threads you can through bolt it fairly easily, IIRC."

I think the above means that as one of the members did; he drilled completely trough the arm and installed a long bolt through the hole with a Nut on the other end.

Wouldn't that cause great risk of cracking the aluminum arm? I don't want to think about what happens when the end of the arm breaks off while going down the highway.

t walgamuth · #24 12-05-2009, 07:59 AM

Not that bolt. the ones going down through the subframe. They are allen heads but the big bolt that goes up is a hex head isn't it?

charmalu · #25 12-05-2009, 11:38 AM

That aluminium arm is some stugh stuff, It ain`t going to break easily.
think about it, you have a 500# engine sitting on them bouncing, twisting etc for xxx 100,000 miles w/o a problem.

I cut the end off one with a saws all (long story, later dude) and it was tough as nails.

I would be more worried about breaking off the 2 little bolts that hold the motor mounts to the body. now that would be bigger problem to deal with.

I think a aluminium arm from the JY is like $10. that would be the route I would go.

charlie

pawoSD · #26 12-05-2009, 11:43 AM

The little allens that hold the mount to the frame are 8.8 hardness.....and they don't really do anything, since the mount sits on the frame the only thing they have to do is keep it in place.

C Sean Watts · #27 12-05-2009, 12:30 PM

Quote:

Originally Posted by pawoSD

It is an excellent word.

Right up there with Explodified.

Or.....Rupturized

in the words of Early Cuyler, "rejuvitized, fastitized, apprecinate"

And who cold forget, "telecomutacatize?"

BodhiBenz1987 · #28 12-07-2009, 05:23 PM

Well, I couldn't find a reverse drill bit, and the guy in Sears wasn't much help on this occasion. I did buy a nice kit of very small extractors, but they won't reach the bolt because of its being far up in the frame. I couldn't find an extension, and Sears and Lowe's were similarly unhelpful in that regard. So it looks like the arm has to come off. I'll try putting it in a vice and getting the bit out with the extractor. If that doesn't work, new arm.
So ... removal process is support engine, remove arm? Anything I'm missing? Not looking forward to this even though it seems simple enough; it's 25 degrees out.

Also, might as well ask this now: What is the proper torque for the bolts that hold the arm to the engine? Thanks.

raslaje · #29 12-07-2009, 07:14 PM

Ebay, Amazon and others have left hand drill bits. Here's some from Harbor Freight but I have no idea of the quality.
http://search.harborfreight.com/cpisearch/web/search.do?keyword=left+hand+drill&Submit=Go

Or just google left hand drill bit

kmaysob · #30 12-07-2009, 07:36 PM

easy outs work great when you know when to back off. (as in it feels like its gonna break) as for the reverse drill bits, you will probably have to chase down a snapon or matco truck. my assumption is the same as brians, there shouldnt be any torque on the bolt since the head is gone. i would remove the arm to try anything on it.