1. Product Overview
The MAC Auto Parts 138924 kit provides a comprehensive set of replacement control arms, ball joints, and complete strut assemblies for the front suspension of specific Ford Explorer and Mercury Mountaineer 4-door models. These components are designed to restore original equipment (OE) performance and handling characteristics.
Figure 1: Complete MAC Auto Parts 138924 Control Arm and Ball Joint Kit. This image displays all included components: two front upper control arms with ball joints, two front lower control arms with ball joints, and two front complete strut assemblies.
1.1 Included Components:
- 1x RK620490 Control Arm with Bushings & Ball Joint (Driver Side Front Lower): This component is for the front lower driver's side of the vehicle.
- 1x RK620491 Control Arm with Bushings & Ball Joint (Passenger Side Front Lower): This component is for the front lower passenger's side of the vehicle.
- 1x RK620225 Control Arm with Bushings & Ball Joint (Driver Side Upper): This component is for the front upper driver's side of the vehicle.
- 1x RK620224 Control Arm with Bushings & Ball Joint (Passenger Side Upper): This component is for the front upper passenger's side of the vehicle.
- 2x Complete Strut Assemblies: These assemblies include the coil spring and shock absorber, designed for direct replacement.
2. Compatibility
This kit is compatible with the following 4-door vehicle models up to the production date of July 18th (07/18):
2.1 Ford Explorer (4-Door):
- V6 245Ci 4.0L Flex/Fi (Vin K)
- V6 245Ci 4.0L F/I (Vin E)
- V8 281Ci 4.6L F/I (Vin W)
2.2 Mercury Mountaineer (4-Door):
- V6 245Ci 4.0L Flex/Fi (Vin K)
- V6 245Ci 4.0L F/I (Vin E)
- V8 281Ci 4.6L F/I (Vin W)
Note: Always verify compatibility with your vehicle's specific year, make, model, and production date before installation. Consult your vehicle's service manual for precise details.
3. Installation (Setup)
WARNING: Suspension work requires specialized tools and knowledge. Improper installation can lead to serious injury or vehicle damage. It is highly recommended that installation be performed by a certified professional mechanic.
3.1 General Installation Guidelines:
- Safety First: Ensure the vehicle is securely lifted and supported on jack stands on a level surface. Disconnect the battery if necessary. Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Reference Vehicle Manual: Always refer to your vehicle's specific service manual for detailed, step-by-step instructions, torque specifications, and any special procedures required for your model.
- Component Removal: Carefully remove the existing control arms, ball joints, and strut assemblies. This typically involves disconnecting brake lines, ABS sensors, sway bar links, and steering components.
- New Component Installation: Install the new MAC Auto Parts control arms and strut assemblies in reverse order of removal. Ensure all bolts are tightened to the manufacturer's specified torque values.
- Alignment: After replacing suspension components, a professional wheel alignment is mandatory to ensure proper vehicle handling, tire wear, and safety.
Some applications may or may not come with grease fittings. If grease fittings are present, ensure they are properly lubricated during installation and as part of routine maintenance.
4. Function and Operation
Control arms are critical components of a vehicle's suspension system, connecting the steering knuckle to the vehicle frame. They allow for vertical movement of the wheels while maintaining proper alignment and stability. Ball joints act as pivot points, enabling the control arms to move freely and the wheels to steer. The strut assemblies provide damping and support the vehicle's weight, absorbing road shocks and maintaining tire contact with the road.
Properly functioning control arms, ball joints, and struts ensure:
- Stable and predictable steering
- Smooth ride quality
- Even tire wear
- Effective absorption of road imperfections
5. Maintenance
Regular inspection and maintenance of suspension components are crucial for vehicle safety and longevity.
5.1 Recommended Maintenance:
- Periodic Inspection: Have your suspension system inspected by a qualified mechanic during routine service intervals (e.g., every 12,000 miles or annually).
- Check for Wear: Look for signs of wear such as torn ball joint boots, cracked bushings, excessive play in joints, or fluid leaks from struts.
- Lubrication (if applicable): If your control arms or ball joints are equipped with grease fittings, lubricate them periodically using appropriate chassis grease as recommended by your vehicle's service manual.
- Wheel Alignment: Ensure wheel alignment is checked and adjusted as needed, especially after hitting potholes or experiencing unusual tire wear.
6. Troubleshooting Common Issues
If you experience any of the following symptoms after installation or during normal operation, it may indicate an issue with your suspension components or alignment:
| Symptom | Possible Cause | Action |
|---|---|---|
| Uneven tire wear | Improper wheel alignment, worn ball joints or bushings | Have alignment checked; inspect suspension components for wear. |
| Clunking or popping noises over bumps | Loose or worn ball joints, bushings, or strut mounts | Inspect all connections and components for looseness or damage. |
| Vehicle pulls to one side | Misalignment, damaged control arm, uneven strut performance | Check alignment; inspect for bent or damaged components. |
| Excessive bounce or poor ride quality | Worn or faulty strut assemblies | Inspect struts for leaks or reduced damping ability. |
If you are unable to diagnose or resolve an issue, consult a professional mechanic.
7. Specifications
- Part Number: 138924
- Brand: MAC Auto Parts
- Component Type: Front Suspension Control Arm and Ball Joint Kit with Struts
- Fitment: Direct Fit OE Replacements
- Included Parts: Upper Control Arms (2), Lower Control Arms (2), Complete Strut Assemblies (2)
- Material: High-quality chassis components
8. Warranty Information
All MAC Auto Parts components included in this kit come with a 5-Year Warranty. This warranty covers defects in materials and workmanship under normal use and service. Shipping costs are not included under the warranty.
For warranty claims or further details, please contact MAC Auto Parts customer support directly. Proof of purchase may be required.
9. Support and Contact
For technical assistance, installation questions, or warranty inquiries, please refer to the contact information provided by your retailer or the manufacturer, MAC Auto Parts.
It is recommended to have your vehicle's VIN (Vehicle Identification Number) and the product's part number (138924) ready when contacting support.
