Do not attempt to find this information anywhere else and then apply it. Using an incorrect torque value can lead to serious damage to your steering system, making your van unsafe to drive. Incorrect tightening could result in a loose connection leading to loss of steering control, or over-tightening could strip the threads or damage the components.
To find the correct specification:
1. Locate your vehicle's service manual: These are often available online (though some require purchase) from sites specializing in repair manuals, or through a local auto parts store. The manual should have specific torque specifications organized by component.
2. Identify your steering gear box: The type of steering gear box will determine the proper torque. This information may be on a tag on the gear box itself.
Without the specific information from your vehicle's service manual, it's impossible to provide a safe torque value. If you can't locate the manual, consult a qualified mechanic.