U-bolt torque spec - 1972 Imperial

Posted By: WyleECoyote

U-bolt torque spec - 1972 Imperial - 08/14/11 01:38 AM

So the old u-bolts didn't survive dis-assembly for the new leaf springs...

I'll be ordering 4 new ones Monday from Springs-N-Things.
What kind of torque specs did these things have from the factory?

PS - Kano Aero Kroil was phenomenal on all other bolts except the u-bolts.

Thanks!

Posted By: 340SHORTY

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 02:03 AM

I agree Kroil is great stuff, smells good to

IIRC somewhere around 50/75 flbs

get the new U bolts from Speedway Motors,, much cheaper....

Posted By: MoparMarq

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 02:43 AM

From '72 FSM:
End of chapter 17;
U-bolt nuts (all except 7-1/4" axle) 45 ft-lbs.

Posted By: WyleECoyote

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 03:14 AM

Quote:

From '72 FSM:
End of chapter 17;
U-bolt nuts (all except 7-1/4" axle) 45 ft-lbs.

Sure felt like 4,445 ft-lbs coming off!

!!!!

Posted By: RapidRobert

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 03:55 AM

Quote:

Sure felt like 4,445 ft-lbs coming off!

I never unscrew the nuts, I split them w a nut cracker then chase the threads w a "thread chasing" die, not a regular die. road debris deforms the threads & they rarely come off easy but w the above new nuts will spin on by hand. Yes 45 sounds low but that's what the FSM lists

Posted By: dOrk !

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 04:08 AM

Quote:

Quote:

Sure felt like 4,445 ft-lbs coming off!

I never unscrew the nuts, I split them w a nut cracker then chase the threads w a "thread chasing" die, not a regular die. road debris deforms the threads & they rarely come off easy but w the above new nuts will spin on by hand. Yes 45 sounds low but that's what the FSM lists

Yeah ...I would agree ...some of the road-debris in NE can-be a real maggot-farmer !

RR ... I just buzzed off a set of U's by-hand from a motorhome Dana 70.... JUST GET a big breaker-bar !!

Posted By: RapidRobert

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 04:11 AM

Quote:

JUST GET a big breaker-bar !!

Doc that's too much work

Posted By: WyleECoyote

Re: U-bolt torque spec - 1972 Imperial - 08/14/11 04:27 AM

Quote:

Quote:

Quote:

Sure felt like 4,445 ft-lbs coming off!

I never unscrew the nuts, I split them w a nut cracker then chase the threads w a "thread chasing" die, not a regular die. road debris deforms the threads & they rarely come off easy but w the above new nuts will spin on by hand. Yes 45 sounds low but that's what the FSM lists

JUST GET a big breaker-bar !!

The breaker bar and pipe is HOW the U-bolts didn't successfully make the dis-assembly phase...