Merc snapped an axle

[Shaun @ Tru6]

Was driving the wagon the other day when there was a loud boom and the car stopped driving. AAA got me home, a little troubleshooting and it looked like a bad drive axle CV joint. Getting it apart, in fact the axle snapped in half. In the pics below, you can see older rust on the rotational shear and really explains the loud boom.

Axles are crazy cheap and easy to put in, but I think the transmission grenaded in some way when the axle snapped. You can put the car in R, N, D, 3, 2 and everything works as expected, or at least with the car stationary and the drive axle off.

When you try to put it back into park, you get a loud metallic flap like a card in bike spokes as something is slowing down the drive shaft. If you let the car sit in N for a second and then quickly put into Park, there's very little, if any, of this noise.

Anyone every hear a sound like that? Looks like I have a nice parts car now.

[EarlyPorsche]

What you are hearing is because there is no shaft in there so the transmission never stops spinning. Stop trying to do that before the park pawl strips away completely.

[enzo1]

I know u posted it but forgot what Mercedes model u have..... '99?

[Shaun @ Tru6]

Thank you! Only did it 4 times to test and listen. New axle coming on Wednesday. Love this car, was worried I would have to give it up.

[Shaun @ Tru6]

It's a 94 E320 Wagon.

[EarlyPorsche]

I've done it before too - everything will be back to normal with a new axle. Did you drop the transmission pan and replace filter, gasket, and fluid? Its easy on a Benz and it is the one thing you need to do to make sure the vehicle lasts a lifetime. Get the fluid at Carquest and it will be dirt cheap.

[Shaun @ Tru6]

Originally Posted by EarlyPorsche

What you are hearing is because there is no shaft in there so the transmission never stops spinning. Stop trying to do that before the park pawl strips away completely.

Does the park pawl have anything to do with how far the car rolls after it's been parked? It can roll several inches after back parking with an abrupt stop. I am typically careful to let it slowly roll with the brake on softly.

[Shaun @ Tru6]

Originally Posted by EarlyPorsche

I've done it before too - everything will be back to normal with a new axle. Did you drop the transmission pan and replace filter, gasket, and fluid? Its easy on a Benz and it is the one thing you need to do to make sure the vehicle lasts a lifetime. Get the fluid at Carquest and it will be dirt cheap.

The fluid was changed 2 years ago. Should I do it again?

[EarlyPorsche]

The amount it rolls is directly proportional to the pawl. If it was done 2 years ago but it wasn't done by you then I would do it once more and then it will literally be the last time you touch the transmission until it needs replacement (if it needs that even).

[Shaun @ Tru6]

OK, thank you, I'll take care of it.

Any ideas on how/why the axle snapped?

[masraum]

OK, thank you, I'll take care of it.



Any ideas on how/why the axle snapped?

You need to stop doing neutral drops when you drag race the ricers.

[dafischer]

Originally Posted by Shaun 84 Targa

Does the park pawl have anything to do with how far the car rolls after it's been parked? It can roll several inches after back parking with an abrupt stop. I am typically careful to let it slowly roll with the brake on softly.

Shaun, it's best not to do that, as it puts a load on the park pawl. This can lead to damage of the pawl or shift linkage when disengaging park, since the pawl is locked into place by the torsional load. It's best to stop, shift into park, and then apply the e-brake to prevent it from rolling against the park stop.

[Red88Carrera]

Originally Posted by Shaun 84 Targa

That looks like my male dog after a long night chasing the neighbors b!tch!

[Tobra]

With a slush box, you want the weight on the parking brake, not the trans. When I drive the wife's truck, it is stop, shift into neutral, apply parking brake, foot off brake pedal, then shift to park.

Pretty trippy it would snap like that, maybe a defective one, but that is pretty odd

[Shaun @ Tru6]

Originally Posted by dafischer

Shaun, it's best not to do that, as it puts a load on the park pawl. This can lead to damage of the pawl or shift linkage when disengaging park, since the pawl is locked into place by the torsional load. It's best to stop, shift into park, and then apply the e-brake to prevent it from rolling against the park stop.

Agreed, but that means I have to get in there and free up the emergency brake cables. Which we are doing, I think I'm putting on new rear calipers as well.

[jyl]

Good news that it is nothing major (x-fingers). The 911 is not exactly, I'd say, date-ready.

[m110]

I've seen this before but never on a 124. That halfshaft must have been hit and then corroded. Replace the halfshaft, which can be done without removing the diff pretty easily, and see how it goes. I bet it will be alright. Changing the tranny oil and filter is always a good idea so that you can look at it yourself.

[Shaun @ Tru6]

Originally Posted by jyl

Good news that it is nothing major (x-fingers). The 911 is not exactly, I'd say, date-ready.

You fared OK, no?

[jyl]

In terror of being analized by some random floorpan bolt . . . But maybe the right kind of girl would like that . . . And she's your "keeper"!

[Pazuzu]

Originally Posted by jyl

In terror of being analized by some random floorpan bolt

AND with THAT...we've officially traveled over to the Other Side...the TMI Side...

Goodbye to sanity, goodbye to dreams not filled with images of jyl being raped by a car, goodbye to all that is decent and clean in this world...