Jaguar MK2 Steering Box Overhaul

The Jaguar MK2 is a timeless classic, cherished by enthusiasts for its blend of style and performance. However, like any vehicle of its vintage, maintaining its driving experience requires attention to detail, especially concerning the steering system. This guide delves into the intricate process of overhauling the steering box, a crucial component often overlooked in basic maintenance. We'll break down the disassembly and reassembly steps, highlight common pitfalls, and provide insights into sourcing replacement parts, ensuring your MK2 steers as smoothly as it did in its heyday.

Understanding the Jaguar MK2 Steering Box

The steering box in a Jaguar MK2 is a recirculating ball type steering system. This design is known for its durability and relatively low friction. It translates the rotational movement of the steering wheel into the linear movement of the steering linkage, which in turn steers the front wheels. Over time, wear and tear can lead to looseness, play, and a less precise steering feel. This overhaul aims to restore that factory-fresh responsiveness.

Disassembly: A Step-by-Step Approach

Before embarking on the disassembly, ensure you have a clean workspace and all necessary tools. Safety first: disconnect the battery and have rags and a container ready for oil spillage.

1. Preparation and Initial Removal:
   • Begin by cleaning the exterior of the steering box to prevent dirt from entering the internals during disassembly.
   • Carefully remove the steering box from the front suspension. This typically involves undoing four mounting bolts. Further cleaning after removal is recommended.
2. Accessing the Universal Joint:

   Crucially, to remove the universal joint, the associated tensioning bolts must be completely removed, not just loosened. This is a common mistake that can lead to damage.

3. Opening the Steering Box:
   • Remove the four 1/2-inch bolts securing the lid of the steering box.
   • Carefully lift off the lid. Be aware that a loose spring is housed within the lid; do not lose this vital component.
   • Pour out the old oil into a suitable container.
   • The roller, located within the main nut assembly, can also be removed at this stage.
4. Separating Internal Components:
   • Remove the bolts from the front and back plates. Exercise extreme caution, as the steel balls within the mechanism can easily fall out. It is advisable to perform this step in a clean, contained area, perhaps over a bucket.
   • If no components fall out immediately, the distance pieces, gaskets, and shims should come out with minimal effort.
   • Gently push out the ball races. Little to no force should be required. Avoid using hammers or excessive force, as this can damage the delicate components. Wiggling the worm shaft back and forth can assist in this process.
   • There are approximately 10 balls on each side of the ball races. Ensure you retrieve all of them.
5. Removing the Worm and Main Nut:
   • Carefully turn the worm out of the main nut. More balls will likely fall out during this process, so be vigilant about not losing them. In total, there are around 31 balls.
   • Balls are also present within the worm tube. While it's often possible to shake these out, it's generally not necessary to remove the tube itself.
6. Removing the Rocker Shaft and Drop Arm:

   The main nut can be tricky to remove with the rocker shaft still in place. It's often easier to remove the rocker shaft first.

   • Remove the large nut securing the drop arm to the rocker shaft. This nut often has a locking washer underneath and may require significant force to loosen. With the worm removed, there's less risk of damaging components during this step.
   • The drop arm is a taper fit onto the rocker shaft. It can typically be removed using a bearing puller or by gentle tapping with a plastic hammer.
   • Once the drop arm is off, the rocker shaft can be removed.

Part Identification and Sourcing

During the overhaul, you'll likely need to replace certain seals and gaskets. Here's a breakdown of common requirements:

Reassembly: Putting It All Back Together

Reassembly is essentially the reverse of disassembly, with careful attention to detail being paramount.

1. Ball Bearing Installation:
   • To aid reassembly, use grease to hold the steel balls in place within the main nut and ball races.
   • Carefully count the balls to ensure you have the correct quantity for each location.
2. Worm and Nut Assembly:

   Turn the worm back into the main nut, again being mindful of the balls. Place the empty race over the thinner front end of the worm and insert the balls into this race. Apply grease to the second ball race to help it hold its position.

3. Plate and Shim Assembly:

   Fit the front plate, distance piece, gaskets, and shims. It's beneficial to maintain some pressure on the worm shaft to prevent the balls from dislodging from their races.

4. Rear Ball Race and Rocker Shaft:

   Assemble the rear ball race, distance piece, gaskets, and shims. Pre-assembling this race can simplify the process. Reinstall the roller. Ensure the drop arm is correctly positioned on the rocker shaft, considering whether the vehicle is Left-Hand Drive (LHD) or Right-Hand Drive (RHD), as per the service manual.

   

5. Lid and Bolt Installation:

   Reinstall the lid, ensuring the infamous spring is correctly seated. There are typically four shorter bolts for the lid and eight longer bolts for other areas, each with a locking washer. Use the correct bolts in their designated positions.

6. Clearance Checks:

   After the lid is secured, check the clearances as detailed in the official Jaguar service manual. This step is critical for correct operation and longevity.

Important Considerations and Tips

• LHD to RHD Conversion: It is generally not possible to convert an LHD steering box to RHD (or vice versa) simply by reassembling the internals. The steering box housing itself is asymmetrical. While many internal components might be interchangeable, the housing dictates the fundamental configuration.
• Component Care: Treat all components with care during disassembly and reassembly. Avoid excessive force, especially on ball races and the worm shaft.
• Cleanliness: Maintain a scrupulously clean working environment throughout the process. Even a small amount of dirt can cause significant wear or damage.
• Service Manual: The official Jaguar service manual is an invaluable resource. Refer to it for specific torque settings, detailed diagrams, and crucial clearance specifications.

Frequently Asked Questions

Q1: How do I know if my Jaguar MK2 steering box needs an overhaul?
Signs include excessive play in the steering wheel, vagueness in steering response, knocking or clunking noises when turning the wheel, or oil leaks from the steering box.

Q2: Can I replace just the worn parts, or do I need to overhaul the entire unit?
While it's possible to replace individual worn parts, an overhaul is often recommended as other components may be nearing the end of their service life. This ensures a more comprehensive and lasting repair.

Q3: What tools are essential for this job?
Essential tools include a comprehensive socket set, wrenches, a torque wrench, a bearing puller, a plastic hammer, screwdrivers, pliers, and a suitable container for draining oil. Referencing the service manual for specific tool requirements is advised.

Q4: Is it difficult to find replacement parts for the steering box?
Some parts, like the main oil seal, are generally available from classic Jaguar parts specialists. However, certain items like specific gaskets or the "O" ring may require custom fabrication or careful sourcing from alternative suppliers.

Q5: How long should a refurbished steering box last?
With a proper overhaul using quality parts and correct assembly, a refurbished steering box can last for many years and thousands of miles, restoring the car's original steering feel and precision.

Overhauling the steering box on your Jaguar MK2 is a rewarding task that can significantly improve the driving experience. By following these detailed steps and paying close attention to the intricacies of the mechanism, you can ensure your classic Jaguar handles beautifully for years to come.