03/11/2025
The supercharger on your Jaguar, particularly the Eaton TVS 1900 found in models like the XFR, is a crucial component for delivering that exhilarating surge of power. However, like any complex mechanical part, it can be prone to issues. This article delves into common problems encountered with these supercharger units, with a particular focus on the 'snout' and whether replacing it is a worthwhile endeavour.
Understanding the Eaton TVS 1900 Supercharger
Unlike earlier Jaguar superchargers, the Eaton TVS 1900 found in newer models cannot be serviced in place. Accessing the oil drain and fill plugs, located in the rear cover, requires the entire supercharger unit to be removed from the vehicle. This is a labour-intensive process, typically taking around 4-5 hours for removal and refitting. It's important to note that the only oil within this supercharger system resides in this rear cover; the snout itself does not contain any oil.
Common Supercharger Woes
Several issues can manifest themselves with these superchargers, leading to performance degradation or concerning noises. Let's explore the most prevalent ones:
1. The "Marbles in a Tin Can" Noise: Plastic Coupling / Torsional Isolator Failure
One of the most frequently reported problems is a loud clattering, rattling, or knocking noise emanating from the engine. Many owners describe this sound as akin to 'marbles rattling in a tin can.' This characteristic noise is almost always indicative of a failing plastic coupling or torsional isolator. Fortunately, Jaguar offers replacement parts for this specific issue, and it's often detailed in their Technical Service Bulletins (TSBs).
How to check: To diagnose this, you'll need to disconnect the drive belt from the supercharger pulley. Once the belt is off, gently rock the pulley forwards and backwards. Any significant play or looseness in the pulley suggests that the plastic coupling or torsional isolator has worn out and requires replacement. This is a relatively minor issue compared to others, and addressing it promptly can prevent more serious damage.
2. The Bearing Whine: Worn Snout Bearings
Another common auditory symptom is a bearing whine, often likened to the sound of a worn wheel bearing or other rotational bearing. This noise typically originates from worn bearings located within the supercharger snout. These bearings are described by manufacturers as 'sealed for life,' meaning they are not designed to be serviced or replaced separately from the snout unit itself.
How to check: With the drive belt disconnected (as described above), spin the supercharger pulley by hand. It should spin smoothly and quietly. Alternatively, you can start the engine and let it idle with the belt disconnected. The engine should idle reasonably well, but it's crucial not to drive the vehicle or let it idle for an extended period in this state. If you hear any grinding, whining, or rough rotation, the snout bearings are likely the culprit.
Are replacement snouts worth it? This is where the question of value comes into play. The snout assembly, including the sealed bearings, is a proprietary part. While some independent specialists might claim to recondition or rebuild these units, the cost of a genuine Jaguar replacement snout can be substantial. As of the time of writing, a new snout part (part number LR058083*) costs approximately £235 plus VAT. Given the cost of the part and the labour involved in replacement, many owners question its economic viability. If you are experiencing snout bearing issues, it's often recommended to also address the plastic coupling/torsional isolator (as mentioned in point 1), as it's a sensible 'belt and braces' approach.
3. Reduced Performance: Worn Supercharger Lobes
A more serious and costly issue arises when the black coating on the supercharger lobes begins to wear off. This coating, often similar to PTFE (Teflon), is vital for maintaining the efficiency and output of the supercharger. As this protective layer erodes, it directly impacts the supercharger's ability to generate boost, leading to a noticeable drop in performance and acceleration.
How to check: Inspecting the lobes requires the supercharger unit to be partially or fully disassembled. You'll be looking for signs of wear on the black coating. If the lobes appear worn or the coating is significantly degraded, the entire supercharger unit will need to be replaced. This is a significant expense, as a new supercharger from Jaguar (part number DW93-6F066-BA*) comes as a complete assembly, including a new snout and a new torsional isolator. This 'belt and braces' approach ensures all common wear points are addressed simultaneously.
Part Numbers and Considerations
When ordering replacement parts, it's imperative to use the correct part numbers and, crucially, to verify them against your vehicle's VIN number. This ensures compatibility and avoids costly mistakes.
Key Part Numbers:**
- Replacement Snout Assembly: LR058083*
- Complete Supercharger Unit (including snout and torsional isolator): DW93-6F066-BA*
*Always verify part numbers with your VIN.
It's worth noting that new snouts and complete supercharger units supplied by Jaguar typically come fitted with the original, stock pulley. If you are considering upgrading your pulley for increased boost, this would be an additional modification to factor in.
Comparative Table: Common Supercharger Issues
| Symptom | Likely Cause | Serviceability | Estimated Cost (Part Only) | DIY Potential |
|---|---|---|---|---|
| Clattering/Rattling noise | Plastic Coupling/Torsional Isolator | Replaceable (Part) | Moderate (for coupling) | Medium |
| Bearing Whine | Snout Bearings | Not Serviceable (Replace snout) | High (for snout) | Low (Requires snout replacement) |
| Poor Performance/Low Boost | Worn Supercharger Lobes | Replace entire supercharger | Very High (for complete unit) | Very Low |
Frequently Asked Questions
Q1: Can I just replace the bearings in the snout?
No, the bearings in the snout are sealed for life and are not designed to be replaced independently. The entire snout assembly must be replaced.
Q2: Is the noise definitely from the supercharger?
While the described noises are highly indicative of supercharger issues, it's always wise to have a qualified mechanic perform a thorough diagnosis to rule out other potential engine problems.
Q3: What is the lifespan of a Jaguar supercharger?
The lifespan can vary significantly depending on driving style, maintenance, and environmental factors. However, common wear points like the torsional isolator and snout bearings can develop issues after a considerable mileage.
Q4: Are there aftermarket alternatives to Jaguar parts?
While some aftermarket companies may offer performance upgrades or replacement parts, it's essential to research their quality and reliability thoroughly. Genuine Jaguar parts offer the assurance of being designed specifically for your vehicle.
Q5: If I replace the snout, should I also replace the torsional isolator?
Yes, it is highly recommended. If you're already undertaking the labour to replace the snout, it's prudent to also replace the torsional isolator as a preventative measure, especially if it hasn't been done before.
Conclusion
The question of whether Jaguar supercharger snouts are 'worth it' is subjective and depends heavily on the specific issue and the owner's priorities. For a worn torsional isolator, the cost of the part is manageable, and the repair is feasible. However, when snout bearings fail, the cost of a replacement snout, coupled with labour, represents a significant investment. If the supercharger lobes themselves show wear, the most economical solution in the long run is often a complete supercharger unit replacement. Always consult with a trusted mechanic and weigh the costs against the expected lifespan and performance benefits before making a decision.
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