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Old 04-11-2017, 02:31 PM   #1
lindenengineering
 
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Default Rear Axle U Bolt Retorquing

Membership of the wheel tappers and shunters club that is!
Some seem to be moving over to the key tappers and paper shufflers GRRr, trying to keep their Lilly whites (hands) clean!

I am seeing large propensity of Sprinter rolling into the shop with LOOSE REAR AXLES and wallowed out spring perches with damaged rear springs in many cases.

This can be easily be detected in its early days and remedied if you would get back into the wheel tappers club (its free) and check the U bolts with hammer and shunt some new U bolts under there when needed.

Just simply tap the U bolt with a hammer!
If its tight it will ping!
If its loose it will make a thunk sound.

Quote:
Originally Posted by SprinterTeck View Post
Taken directly from WIS this morning the torque U-bolts as follows


[B]SPRING U- bolt on rear axle spring to rear axle M14X1.5 Nm 160 Model 906.6/7[/B]


[B]Rear spring U-Bolt to rear axle m14X1.5 Model 904./5 690.612/613.904 Nm 170[/B]


So:
NVC3 - 118 foot lbs torque for the 2007 and up Sprinters and
T1N - 125 ft/lbs for the 904 or 2001-2006 Sprinters.

Hope that helps a bit.
If its rusted in place it MUST be freed off and re-torqued !

Torque pattern here: https://sprinter-source.com/forum/sh...1&postcount=35

Dennis

Last edited by hkpierce; 12-30-2017 at 04:40 PM.
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Old 04-11-2017, 02:34 PM   #2
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Default Re: Membership is declining.

Somewhat random, or is there any correlation with model years or miles?

vic
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Old 04-11-2017, 02:46 PM   #3
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Default Re: Membership is declining.

No Vic its random but found more often on the later 906 NCV3 models.
Dennis
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Old 04-11-2017, 04:06 PM   #4
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Default Re: Membership is declining.

That's never been a thing on any of my American vans; I'll give it a try

Tightening until the bolts started to deform worked on my Ford

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Old 04-11-2017, 04:17 PM   #5
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That is something that it states to do one the 1st PM according to the sheet from Benz, however I make sure to re-torque them on every PM here at Coke. We do Pms every 7,500 miles. So far we have never had any issues of this. I have found several times the bolts do need a few degrees before the torque wrench "clicks"....
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Old 04-12-2017, 06:08 AM   #6
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Default Re: Membership is declining.

This is a good warning, I took mine in for a checkup in case I missed anything and they did indeed find loose u bolts.
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Old 04-12-2017, 10:32 PM   #7
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Is this simply a matter of jumping under there and retorquing, or does the rear suspension first need to be unloaded?
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Old 04-13-2017, 12:48 AM   #8
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Default Re: Membership is declining.

Quote:
Originally Posted by sprint2freedom View Post
Is this simply a matter of jumping under there and retorquing, or does the rear suspension first need to be unloaded?
Free 'em off in the axle perch eyelets as they can be seized in there by corrosion.
Re-torque to 125 lbf ft.
Dennis
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Old 04-13-2017, 12:55 AM   #9
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Default Re: Membership is declining.

Refer to Mercedes-Benz document AP32.20-D-3271H for details on recommended re-torquing procedures.

General note: On older vehicles, I would recommend several applications of Gunk brand Liquid Wrench or equivalent rust penetrator on nut and threads common to u-bolt the day prior to retorquing. Especially, vehicles operated on salt Roads.
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Last edited by Bobnoxious; 04-13-2017 at 06:39 PM.
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Old 04-13-2017, 04:35 AM   #10
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Default Re: Membership is declining.

If it's rusted in place do you NEED to retorque it? I hope to drive this thing into the ground 10,000 miles a year. Hopefully it will take many more years.

-Randy
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