Rear suspension - arm geometry

Blink · 25th October 2019, 13:06

I'm trying to find out the angles of the upper and lower suspension arms when the car is on level ground and sat on its wheels. The reason being I want to avoid the notorious spinning captive nut problem by pre-tightening the arm-to-subframe bolts before I refit the whole lot onto the car (it's a 75 saloon btw). Trying to torque up the bolts with everything on the car is impossible if one or both of the captive nuts starts spinning.

Does anyone know what the angles are?

Here's a quick diagram. The green & red lines represent the upper & lower arms - I need to know the correct angle for both.

The photo above shows the subframe as viewed from the front of the car but it's easier to look at it from the rear when it's on the car.

Like this ... (the old subframe viewed from the rear) (it's being lowered to the ground on threaded rods):

25th October 2019, 13:06	#1
Blink Posted a thing or two Rover 75 Saloon Join Date: Apr 2019 Location: Under the car Posts: 1,840 Thanks: 210 Thanked 244 Times in 221 Posts	Rear suspension - arm geometry I'm trying to find out the angles of the upper and lower suspension arms when the car is on level ground and sat on its wheels. The reason being I want to avoid the notorious spinning captive nut problem by pre-tightening the arm-to-subframe bolts before I refit the whole lot onto the car (it's a 75 saloon btw). Trying to torque up the bolts with everything on the car is impossible if one or both of the captive nuts starts spinning. Does anyone know what the angles are? Here's a quick diagram. The green & red lines represent the upper & lower arms - I need to know the correct angle for both. The photo above shows the subframe as viewed from the front of the car but it's easier to look at it from the rear when it's on the car. Like this ... (the old subframe viewed from the rear) (it's being lowered to the ground on threaded rods): Last edited by Blink; 25th October 2019 at 13:13..