Can any of you that have had a Eurocharged 180mm crank pulley installed confirm the torque specs on the new crank bolt?? I was all ready to go for the install tomorrow but, the Mercedes tech that is doing the install states the specs from EC aren't really possible. I'm just looking for someone to confrm which is correct..

The Mercedes tech states the bolt should be torque to 200nm(148 foot/pounds) and then the bolt is turned an additional 90 degrees to lock/stretch it.

I was told previously the bolt needs to be torqued to 275 foot/pounds and then the bolt is turned an additional 90 degress to lock/stretch it.

Everyone agree's the 90 degree turn is correct but, I'm getting conflicting stories about the initial torque setting on the bolt. I've been told if they are not torqued incorrectly and come off, it is very costly...

Also, does anyone ever use loc-tite on the bolt as an additional precaution or no?

Thanks,
Todd

 

275 and 90 degrees for our pullies

 

Todd -

All pulleys made in 2011 require the new trq specs I emailed you.

Everyone should have the same TRQ specs provided in the box.

Failure to comply will void the warranty on the pulley.

If the tech is unable to follow our instructions, then I suggest finding a new shop to install the pulley.

 

Jake, is that 275 Nm or ft-lbs prior to the additional 90°?

Either way, one best eat his Wheaties beforehand. ;)

 

ft/lbs

and oh ya....big time lol

 

Jerry told us 200ft lbs and 90 degree turn.

 

Are these specs for the 2011 pullies?

 

Mine says 265 + 90. I'll tell you what though...I have no idea how I'm going to get that much torque out of my body...LOL.

 

We had to take apart the casing on the trans and find the flywheel. I jammed a crowbar into the space while the teck got to work on the crank bolt with what looked to be a 4ft tq wrench. It took a couple runs but we got her to 275 + 90. The AMG certified tech said that those numbers are insane. He says tat the stock factory settings when installing crank pulleys are nowhere near what EC recommends. Believe me tho, under load it feels good knowing that bolt is literally fused with the pulley...

 

The bolt that is being sent with the new pulley is a stock Mercedes/AMG bolt. it is not a bolt that is manufactured by the makers of the pulley. The makers of the bolt state that the bolt is torque to yield, meaning that the bolt it stretched to its max clamping force at 150 ft-lbs, and then 90 degrees. Mercedes is saying that at that point the bolts ability to clamp is compromised and it should not be reused, or re-torqued as it will fail. Why is the new directions requiring the same bolt to be torqued to over twice what Mercedes/AMG are saying to bolt is Capable of holding.
If you contact any bolt manufacture, ARP for example, they don't care what you are using the bolt for, they will tell you what the clamping force, and torque capabilities of the bolt are.
Has ASP done testing on this bolt to determine that Mercedes is wrong, and they bolt can handle this extra torque?
Is this torque causing the bolt to stretch and not able to hold the pulley correctly?
Causing the woodruf key to hold all the torque, and shear?