Upper and lower link screw bushing torque spec

[Zendar]

FSM says to torque the upper link screw bushing to 35-55 kg-m (253-398 ft-lb) and lower link screw bushing to 20-30 kg-m (145-217 ft-lb).

 

Are these specs correct? I tried to torque one of the upper link screw bushings and the threads on the link just gave out...  :mad:

[datzenmike]

My '73 620 FSM shows a similar amount, wow that's a lot of torque.... 253 to almost 400 pounds!!!

 

To be sure there is one on each side screwing inward with a grease nipple in the middle? correct?

[Zendar]

Yup, one on each side, you have to screw it first to the link and torque, then screw it to the spindle.

 

I guess I'll just have to spot weld the link to the screw bushing so it won't come loose.

[Dawa]

hahaha holy shit that is a lot of torque! 

just checked my 73 fsm and it says the same. i cant help but feel its a typo.

when did the 620s convert to ball joint? is 77 ball joint? are you referencing a 77 fsm?

 

720 fsm tq  specs are considerably lower:

 

upper link:

80-108 ft lb to frame, 12-16 ft lb to upper ball link

 

lower link

80-108 ft lb to frame, 28-38 ft lb to lower ball joint

[Zendar]

Mine is a early 77, it has kingpins.

[Dawa]

ah ok. so kingpin for sure. gotcha. 

i think one would need a torque multiplier to get those numbers. that or convert to ball joint :)

[Zendar]

I torque'd the other upper bushings to 210 ft-lb. Should be enough to keep them from unscrewing imo.

 

Ball joints would be nice but the ball joint lca are a bitch to find here in Finland :p