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MG MGA - kingpin torque value
|HI, Can someone tell me what the torque value is supposed to be for the upper and lower kingpin securing bolts (the ones that connect the kingpin to the a-arms). Thanks!|
|These are 1/2-inch fine thread extra strength bolts, and they might tolerate as much as 200 Lb-Ft torque without damage (maybe). You must use locking nuts on these bolts, so the torque is not critical. Just use a big wrench and give it a good yank. I'd say 70-Lb-Ft like main bearing caps is about right.|
"they might tolerate as much as 200 Lb-Ft torque without damage (maybe)"
You want to actually try that?
Typical high grade 1/2 UNF bolts from BMC are 60-65, eg, MGB wheel nuts, rear shocks, etc.
"You must use locking nuts on these bolts, so the torque is not critical."
They are supposed to be castellated hi-nuts (and spring washers) with split pins.
Nut locking schemes do not ensure integrity of the joint, they simply keep the nut from falling off if it is left or becomes loose.
The joint design requires sufficient clamping that the distance tube and associated parts cannot rotate relative to the A arms, even when greasing has been neglected. Most failures of this system result in A arm holes and the bolts becoming worn because they are left loose or become loose because the distance tube has seized in the bush.
I use antiseize, and torque to 55lbft, plus whatever it takes to get to the next split pin hole.
This thread was discussed on 21/09/2011
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