22/03/2013
The allure of a classic car often extends to its smallest details, and for many, the VDO Kienzle clock is a cherished piece of automotive history. These robust mechanical timepieces, known for their durability and distinctive design, can, however, fall victim to the passage of time themselves. Whether it's a slow tick, a complete stop, or simply a need for a clean and reset, understanding how to approach the repair of a VDO Kienzle clock is a rewarding skill for any classic car enthusiast. This guide will walk you through the process, from initial removal to the delicate art of bringing your timepiece back to life.
Understanding the VDO Kienzle Clock
Before diving into the repair, it's essential to appreciate the engineering behind these clocks. VDO (Zustandsschreiber) and Kienzle are renowned German manufacturers, and their collaboration produced some of the most reliable dashboard clocks of their era. These are typically mechanical, wound by hand or sometimes by an electric mechanism. Their internal workings involve a series of gears, springs, and a balance wheel that oscillates to keep time. The simplicity of their design, while impressive, also means that common issues often stem from wear and tear on these fundamental components, or from a build-up of dust and old lubricant.
Tools and Preparation
Embarking on a clock repair requires a delicate touch and the right tools. You'll want a set of small precision screwdrivers, a magnifying glass or loupe, fine-tipped tweezers, a soft brush (like a makeup brush or artist's brush), and potentially some specialised clock oil or a very light, non-gumming lubricant. It's also advisable to have a clean, well-lit workspace and a container to keep small parts organised. Before you even begin, it's crucial to remember that these are delicate mechanisms. Patience is your most valuable tool here.
Step-by-Step Repair Guide
1. Removal from the Vehicle
The first step, as you've rightly pointed out, is carefully removing the clock from its mounting. This will vary depending on the vehicle, but generally involves locating retaining clips or a mounting bracket. Once the clock is out of its housing, you'll need to address the chrome trim ring. This ring often holds the faux glass or plastic cover in place. As mentioned, be extremely cautious not to crack the plastic cover. Take a moment to study how the trim ring is attached; it might be a press-fit, or it could have small screws or clips. Understanding its mounting is key to a successful removal without damage.
2. Dismantling the Clock
With the trim ring off, you'll gain access to the clock's face and internal mechanism. The face itself might be held by the bezel, which is often part of the chrome trim ring assembly. If not, it might be secured by small tabs or screws on the rear of the clock housing. Once the face is removed, you'll see the intricate workings. Here, the careful study you performed earlier on the trim ring will serve you well. You'll need to remove any retaining screws or clips holding the mechanism within its housing. Work methodically, and if possible, take photos as you go to aid reassembly. Don't force anything; if a part feels stuck, there's likely a hidden fastener or a specific way it needs to be released.
3. Cleaning the Mechanism
This is where the soft brush and tweezers come into play. Gently dust away any accumulated grime, lint, or debris from the gears and springs. If there's evidence of old, gummy lubricant, you might need a cotton swab very lightly dampened with a suitable cleaning solution. However, be extremely sparing with any liquids, as too much can damage the delicate components. The goal is to remove obstructions and old residue without washing away any remaining functional lubricant.
4. Lubrication
Lubrication is critical for the smooth operation of any mechanical clock. For VDO Kienzle clocks, a specific clock oil is ideal. Apply a tiny drop to the pivot points of the gears and the balance wheel staff. Over-lubrication is a common mistake that can attract dust and gum up the mechanism over time. You want just enough to reduce friction. If you don't have dedicated clock oil, a very light, non-gumming synthetic lubricant might suffice in a pinch, but it's not ideal for long-term reliability.
5. Reassembly and Testing
Reassembly is the reverse of dismantling. Refer to your photos and notes to ensure everything is placed back correctly. Double-check that all screws and clips are secure but not overtightened. Once the mechanism is back in its housing and the face is replaced, carefully reattach the trim ring. Gently wind the clock (if it's a manual wind) or ensure the electric mechanism has power. Listen for the ticking sound. If it's running, let it go for a few hours to see if it maintains accurate time. You may need to make minor adjustments to the regulator if the timekeeping is off.
Common Issues and Troubleshooting
Here's a look at some typical problems and how to address them:
| Problem | Possible Cause | Solution |
|---|---|---|
| Clock not running at all | Dirt/debris, lack of lubrication, broken spring, loose gear | Clean and lubricate, check for visible damage, ensure gears are seated properly. |
| Clock runs but stops | Insufficient lubrication, bent balance wheel, obstruction | Lubricate, gently check balance wheel for freedom of movement, clean again. |
| Clock runs too fast or too slow | Incorrect regulator setting, dirt affecting balance wheel, weak mainspring | Adjust regulator (small lever usually near balance wheel), clean and lubricate, consider mainspring replacement if worn. |
| Ticking is irregular | Dirt, loose component, worn pivots | Thorough cleaning, ensure all parts are secure, professional servicing might be needed for worn pivots. |
When to Seek Professional Help
While many VDO Kienzle clock issues can be resolved with careful DIY intervention, some problems may require the expertise of a professional clockmaker or a specialist in vintage automotive electronics. If you encounter a broken mainspring, heavily worn pivot holes, or if the mechanism appears too complex or damaged to tackle yourself, it's best to entrust it to someone with the proper tools and experience. Attempting repairs beyond your skill level could lead to further damage.
Preserving Your Classic Timepiece
The VDO Kienzle clock is more than just a way to tell time; it's a piece of automotive heritage. By understanding its mechanics and approaching repairs with care and the right techniques, you can ensure this classic component continues to function and add character to your vintage vehicle for years to come. Regular, gentle cleaning and avoiding harsh environments will also contribute to its longevity. Remember, patience and precision are paramount throughout this process.
Frequently Asked Questions
Q1: Do I need special tools to remove the trim ring?
Typically, no. A careful application of pressure and understanding how it's attached should suffice. However, a plastic trim removal tool can be helpful to prevent scratching if you're concerned about the surrounding dashboard material.
Q2: What type of lubricant should I use?
Ideally, a fine clock oil specifically designed for mechanical movements. Avoid WD-40 or general-purpose lubricants, as they tend to gum up mechanical clocks.
Q3: How do I know if the mainspring is broken?
A broken mainspring will prevent the clock from holding any power. You won't feel any resistance when winding it, and the clock won't run even after cleaning and lubrication.
Q4: Can I use compressed air to clean the clock?
While compressed air can be useful for blowing dust away, it should be used with caution. A strong blast could potentially dislodge delicate parts or drive dust deeper into the mechanism. A soft brush is generally safer for internal cleaning.
Q5: My clock is electric. How do I test it?
Ensure the clock is receiving the correct voltage from the car's electrical system. If testing outside the car, you may need to carefully apply the appropriate voltage to the terminals, being mindful of polarity.
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