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ND suspension torque specs

Posted: Fri Oct 30, 2020 2:09 pm
by Greg @ GWR
I have discovered, along with a lot of ND owners, unless you have access to an ND shop manual it is hard to find the torque specs for the ND suspension. These numbers are useful if you do a spring/shock or coilover upgrade. These are taken from the shop manual via Mitchell, and corresponding photos are on miata.net at the link at the bottom. Enjoy!

ND suspension torque specs

All Numbers in Ft/Lbs

Front:
Shock mounts -
Upper (37-43)
Lower (40-47)
Upper control arm (40-47)
Upper spindle/ball joint (42-57)
Lower control arm -
Alignment bolts (100-121)
Lower spindle/ball joint (79-94)
Sway bar end links (32-38)

Rear:
Shock mounts -
Upper (34-40)
Lower (49-59)
Links -
Leading link - [upper rear] (49-59 both ends)
Lower Lateral - [rear lower] (48-57 spindle end, 63-75 alignment bolt)
Upper Lateral - [front upper] (49-59 spindle end, 48-57 subframe end)
Lower link - [front middle] (49-59 spindle end, 63-75 alignment bolt)
Trailing link - [front lower] (48-57 both ends)
Sway bar end links (26-29)

Link to miata.nt with photos from the shop manual
https://forum.miata.net/vb/showthread.php?t=647515

Re: ND suspension torque specs

Posted: Sat Jan 28, 2023 7:44 pm
by avera01
There is a controversy going on on another forum regarding when to torque two rear link bolts. The service manual says to torque them "when lifting" the car. Some folks imply that this means when the wheels are unloaded. Others like myself is under the impression to torque all bolts when the suspension is under load either on the ground or using the Rocky method. Why the Mazda service manual has that notation for just those two bolts is unknown and thus creates this issue. Hopefully someone is your shop can provide a clear answer.

This is what the service manual says:

Lower Link Outer Bolt Installation Note

1. Completely tighten the lower link outer bolt when lifting up the vehicle.

Upper Lateral Link Outer Bolt Installation Note

1. Completely tighten the upper lateral link outer bolt when lifting up the vehicle.