Alfa 159 Gearbox Explained: Types and Care

The Alfa Romeo 159, a vehicle celebrated for its captivating design and spirited performance, owes much of its driving character to the sophisticated transmission systems it employed. For any proud owner or prospective buyer, understanding the various types of gearboxes available in the Alfa 159 is crucial, not just for appreciating its engineering prowess, but also for ensuring its longevity and optimal performance. From engaging manual options to convenient automatics and the unique Selespeed system, each gearbox offered a distinct driving experience, meticulously engineered to complement the powerful engines.

When the Alfa 159 first hit the market, it was equipped with a range of engines designed to offer both exhilarating performance and environmental responsibility. Central to translating this power to the road were the innovative gearboxes. Whether you prefer the direct control of a manual or the ease of an automatic, the Alfa 159 had an option tailored to various driving preferences, all boasting six speeds to maximise efficiency and responsiveness.

The Heart of Engagement: Mechanical Six-Speed Gearboxes

At the core of the Alfa 159's initial offering were its new mechanical six-speed gearboxes. These were lauded for their precise engineering, designed to deliver a truly engaging driving experience. Characterised by their short strokes, precise engagement, and low loads, these manual transmissions offered drivers an intimate connection with the car. This design philosophy ensured that gear changes were not just functional, but an integral part of the Alfa Romeo 'cuore sportivo' experience. The short throws between gears allowed for rapid and confident shifts, enhancing the car's sporty feel, while the precise engagement meant that selecting the correct gear was always a positive and assured action. The low loads on the gear lever contributed to a light and effortless feel, reducing driver fatigue, especially during spirited driving or in stop-start traffic.

These robust manual gearboxes were paired with all three petrol engines available at launch: the potent 3.2 JTS (260 bhp), the sprightly 2.2 JTS (185 bhp), and the efficient 1.9 JTS (160 bhp). Each of these JTS (Jet Thrust Stoichiometric) direct injection petrol engines was developed to embody Alfa Romeo's commitment to enjoyable driving and high performance, with the manual gearbox serving as the perfect conduit for this power. Similarly, the three Multijet turbodiesel engines – the 1.9 8v JTDM (120 bhp), 1.9 16v JTDM (150 bhp), and the new 2.4 20v JTDM (200 bhp) – also initially came combined with these 6-speed manual gearboxes. This universal application underscored the confidence Alfa Romeo had in the quality and performance of these mechanical units across its diverse engine range.

Driving Dynamics with the Manual Gearbox

For enthusiasts, the manual gearbox is often the preferred choice, offering unparalleled control over the car's power delivery. In the Alfa 159, the carefully calibrated ratios of the six-speed manual gearbox ensured that the engine was always within its optimal power band, whether accelerating hard or cruising efficiently. The sixth gear, in particular, was instrumental in reducing engine revolutions at higher speeds, contributing to better fuel economy and a quieter cabin during motorway journeys. The direct feedback through the gear lever allowed drivers to truly feel the mechanics at work, making every shift a tactile and rewarding experience. This level of engagement is a hallmark of Alfa Romeo, and the manual gearbox played a significant role in upholding that tradition.

Embracing Convenience: Automatic and Selespeed Transmissions

Recognising the demand for greater driving convenience, Alfa Romeo also introduced automatic transmissions and a Selespeed robotised gearbox for certain versions of the 159 after its initial launch. Like their manual counterparts, all these automatic and robotised options featured six speeds, maintaining the balance between performance and efficiency.

The Evolution of Automatic Transmissions

While general automatic transmissions became available, a specific highlight was the new 6-speed sequential automatic transmission that arrived in 2006, specifically paired with the new 200 bhp 2.4 JTD Multijet 20v engine. This unit was a testament to Fiat Auto's ongoing supremacy in diesel engine technology and transmission development. It was designed to be compact and light, and notably, it incorporated the control unit directly within the gearbox itself. This integration not only streamlined the system but also contributed to its responsiveness.

Particular attention was paid to fuel consumption with this automatic gearbox. The use of low friction oil was a key innovation, significantly boosting efficiency by reducing internal resistance. Furthermore, the sixth speed was specifically engineered for motorway use, optimising cruising efficiency and comfort. This design ensured that even with the convenience of an automatic, the Alfa 159 maintained its commitment to performance and economy, offering smooth, seamless shifts that enhanced the driving experience, especially in urban environments and during long-distance travel.

The Robotised Alternative: Selespeed

The Selespeed system, a robotised manual gearbox, offered a unique blend of manual control and automatic convenience. While the provided information doesn't delve into specific details about the 159's Selespeed variant, generally, Selespeed systems operate as a conventional manual gearbox but with an electro-hydraulic actuator system managing clutch engagement and gear selection. This allowed drivers to shift gears via paddles on the steering wheel or through the gear lever, without needing to operate a clutch pedal. It provided the driver with a sense of control similar to a manual, but with the added convenience of automated clutch operation, making it particularly appealing for those who wanted a sportier feel without the constant manual clutch work in traffic. The six speeds ensured a broad range of ratios for various driving conditions, from spirited acceleration to relaxed cruising.

Engine and Gearbox Combinations: A Summary

To provide a clearer picture, here's a summary of the gearbox options available with the Alfa 159's engine lineup:

Maintaining Your Alfa 159's Gearbox

Proper maintenance is paramount for the longevity and smooth operation of any gearbox, and the Alfa 159's transmissions are no exception. The gearbox is a complex mechanical assembly, and regular care, particularly concerning its lubrication, is vital. Ignoring maintenance can lead to costly repairs and a diminished driving experience.

The Importance of Gearbox Oil

The fluid inside your gearbox, commonly referred to as gearbox oil, is critical for lubricating moving parts, cooling the system, and protecting against wear. Over time, this oil can degrade, lose its lubricating properties, and accumulate contaminants, which can lead to increased friction, harder shifts, and eventually, internal damage. For the Alfa 159, particularly for the mechanical gearboxes, ensuring the correct specification and quality of gearbox oil is crucial.

For owners of the manual gearbox, such as the 3.2 JTS, replacing the gearbox oil regularly can significantly improve gear changes, making them silky smooth. A common recommendation within the Alfa Romeo community is to opt for quality oils such as Millers Gearbox oil, provided you obtain the specific specification required for your vehicle. High-quality oil ensures optimal lubrication and protection, which directly translates to a better feel and extended life for your transmission.

Avoiding Oil Flushes

It's important to note a piece of advice often given by experienced mechanics and enthusiasts: avoid using an oil flush for your gearbox. While engine oil flushes are sometimes used, applying this practice to a gearbox can be detrimental. Flushes are designed to dislodge debris and sludge, but if these particles are not completely removed, they can circulate within the gearbox, potentially causing blockages or damage to sensitive components. The general consensus is, if your gearbox isn't exhibiting problems, a simple drain and refill with fresh, high-quality oil is the safest and most effective approach. 'If it ain't broke, don't fix it' certainly applies to gearbox flushes.

Lubricating Gear Cables

Another often overlooked but crucial maintenance task, especially for manual transmission Alfa 159s, is the regular lubrication of the gear cables. These cables connect the gear stick to the gearbox, transmitting your movements to the transmission. Over time, they can become stiff or sticky due to dirt ingress or simply lack of lubrication, leading to notchy or difficult gear changes. Regularly lubricating these cables can dramatically improve the smoothness and precision of your gear shifts, making it a 'must' for maintaining that 'silky smooth' feel that Alfa 159 drivers appreciate.

Real-World Experience and Lessons Learned

Personal experiences often highlight the importance of these maintenance points. For instance, an owner of a 3.2 JTS manual Alfa 159 reported changing their gearbox oil at 125,000 miles, experiencing immediate improvements. However, a subsequent CV boot replacement by a garage in Italy led to the original, high-quality gearbox oil being replaced with a cheaper, budget alternative. The difference in shifting quality was instantly noticeable, underscoring the profound impact that oil quality has on gearbox performance. This experience led to another oil change, reaffirming the value of using the correct, high-specification fluid. This also highlighted how seemingly unrelated repairs, like CV boot replacements, can impact gearbox fluid if the driveshaft is removed, making it essential to confirm the quality of replacement fluids used.

Comparative Overview of Gearbox Types

Choosing between a manual, automatic, or Selespeed gearbox in an Alfa 159 involves considering various factors:

Frequently Asked Questions (FAQs)

Q: How often should I change the gearbox oil in my Alfa 159?

A: While Alfa Romeo might specify 'for life' fluids in some cases, it's generally recommended to change manual gearbox oil every 60,000 to 80,000 miles, or every 5 years, whichever comes first. For automatic transmissions, intervals can vary, but many specialists recommend changing the fluid every 40,000 to 60,000 miles, or every 3-5 years, depending on driving conditions. Always consult your owner's manual or a specialist for the precise recommendation for your specific model and gearbox type.

Q: What type of gearbox oil should I use for my Alfa 159?

A: The exact specification of gearbox oil (e.g., viscosity, API GL rating) is crucial and depends on your specific gearbox model. It's vital to refer to your Alfa 159's owner's manual for the precise fluid specification. Using a high-quality oil that meets or exceeds these specifications, such as Millers Gearbox oil, is often recommended by enthusiasts for optimal performance and protection.

Q: Are Alfa 159 gearboxes reliable?

A: Generally, the mechanical six-speed gearboxes in the Alfa 159 are considered robust and reliable if properly maintained. Automatic transmissions, particularly the later 6-speed sequential unit, are also well-regarded. The Selespeed system, while offering a unique driving experience, can be more complex and may require more specialised attention and maintenance due to its electro-hydraulic components.

Q: What are the signs that my Alfa 159's gearbox needs attention?

A: Common signs of gearbox issues include difficulty shifting gears (notchy or stiff shifts), grinding noises during gear changes, slipping gears (engine revs but car doesn't accelerate proportionally), unusual noises (whining, clunking) coming from the transmission, or a burning smell (often indicative of overheating fluid or slipping clutch/components). If you notice any of these symptoms, it's advisable to have your gearbox inspected by a qualified mechanic promptly.

Q: Can I convert my Alfa 159 from a Selespeed to a manual?

A: While technically possible, converting a Selespeed or automatic Alfa 159 to a manual gearbox is a highly complex and expensive undertaking. It involves replacing the entire gearbox, clutch pedal assembly, hydraulics, wiring loom, and reprogramming the ECU. It's generally not recommended due to the significant cost and complexity involved.

Conclusion

The Alfa Romeo 159 offered a range of sophisticated gearbox options, each designed to complement its powerful engines and deliver a distinct driving experience. From the direct engagement of the mechanical six-speed manual to the seamless convenience of the automatic and the unique character of the Selespeed robotised system, there was a transmission for every driver. Understanding these differences, coupled with diligent gearbox oil changes and proactive maintenance, is key to preserving the exhilarating performance and renowned reliability of your cherished Alfa 159. By giving your gearbox the attention it deserves, you ensure that every journey in your 159 remains as smooth and enjoyable as the day it left the factory.

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