Fiat Coupé 20v Turbo: Power and Maintenance

Unleashing the Fiat Coupé 20v Turbo: Power, Performance, and Practicality

The Fiat Coupé 20v Turbo stands as a testament to Italian automotive design and engineering, blending striking aesthetics with robust performance. For enthusiasts and owners alike, understanding the car's capabilities and the intricacies of its maintenance is paramount. This article delves into the heart of the 20v Turbo, detailing its power output, torque figures, and providing a comprehensive guide to one of its most critical maintenance tasks: the cambelt replacement.

Power and Performance Metrics

At the core of the Fiat Coupé 20v Turbo's allure is its potent powerplant. Equipped with a turbocharged five-cylinder in-line engine, this Italian thoroughbred delivers an exhilarating driving experience. The engine is transversely mounted at the front, driving the wheels with vigour.

The 20v Turbo is renowned for its responsive acceleration and a characterful engine note, a hallmark of its five-cylinder configuration. The 310 Nm of torque available from low revs ensures that the car pulls strongly through the gears, making it equally adept at spirited driving on winding roads and effortless cruising on the motorway. The 220 PS power output, delivered at 5750 rpm, provides ample performance for its class.

The Importance of Cambelt Maintenance

One of the most critical, yet often daunting, maintenance tasks for many vehicles is the cambelt (or timing belt) replacement. For the Fiat Coupé 20v Turbo, this procedure is vital for preventing catastrophic engine damage. A snapped or slipped cambelt can lead to pistons colliding with valves, resulting in expensive repairs. Fiat themselves advise regular replacement intervals for the cambelt to ensure the longevity and reliability of the engine.

A Comprehensive Guide to Cambelt Replacement (20v Coupe)

The Fiat Coupé 20v engine, while a marvel of engineering, presents some challenges for DIY maintenance due to its compact packaging and specific fastener types. This guide, adapted from detailed instructions, outlines the process for changing the cambelt, auxiliary belt, tensioner, and water pump.

Tools and Parts You'll Need:

• 2x Trolley Jacks and 1x additional jack
• Ribe bits (M6 and M8) or suitable Torx bits (T5)
• Cam locking tools (optional, but recommended for precision)
• New Cam Belt
• New Auxiliary Belt
• New Water Pump
• New Fixed Tensioner
• Tipp-Ex (or similar white marker)
• Anti-freeze
• Thread Locking Solution
• Red Gasket Sealer
• 24mm Spanner
• 13mm, 17mm, 19mm Spanners
• 4mm and 6mm Allen Keys
• Torque Wrench (highly recommended for critical bolts)
• Assorted screwdrivers and pry tools

Step-by-Step Cambelt Replacement:

The process involves numerous steps, and meticulous attention to detail is crucial. Here's a breakdown of the key stages:

1. Preparation: Safely jack up the front of the car, support it on an axle stand, and remove the OSF (Offside Front) wheel. You'll need to lower and raise the engine during the process, so don't elevate the car too high. Remove the bottom section of the plastic wheel arch liner.
2. Accessing the Belts: Loosen the Ribe bolts on the crank pulley. It's advisable to lock the crank by placing the car in gear and using a screwdriver in the brake disc slots. Loosen the auxiliary belt tensioner pulley nuts and remove the auxiliary belt.
3. Engine Mounts: To gain access, you'll need to strategically loosen and remove engine mounting bolts. This allows the engine to be moved slightly, providing clearance for belt removal and installation. Typically, the top strut bracket bolts and the lower engine mount bolts are involved. Use jacks to support the engine's weight before removing critical mounting bolts.
4. Cam Cover Removal: With the engine positioned correctly, you can now access and remove the cam cover. This usually involves undoing several Ribe or Torx bolts.
5. Crank Pulley Removal: Position the engine at Top Dead Centre (TDC) and remove the Ribe bolts securing the bottom pulley. The pulley might require gentle persuasion with hammer taps to release.
6. Marking and Alignment: This is a critical stage. Mark the existing cambelt using Tipp-Ex to correspond with marks on the camshaft pulleys and the engine casing. This aids in aligning the new belt. Ensure the crank is at TDC (often indicated by marks on the pulley and casing).
7. Tensioner and Water Pump Removal: Loosen the adjustable tensioner to slacken the cambelt and remove it. Undo the fixed tensioner and the bolts securing the water pump. Carefully pry out the old water pump.
8. Installation: Clean the water pump aperture thoroughly. Apply red gasket sealer to the block and install the new water pump, ensuring the bolt holes align. Re-insert and tighten the water pump bolts.
9. New Cambelt Installation: Transfer your Tipp-Ex marks from the old belt to the new one. Carefully route the new cambelt, ensuring all marks align with the respective pulleys and timing marks. Pay attention to the direction of rotation arrows on the belt.
10. Tensioning: Install the new fixed tensioner. Use a bar to apply tension to the belt against the tensioner, then tighten the adjustable tensioner's centre nut. The belt should have a slight give, typically around 1cm when twisted by hand. Over-tensioning can lead to premature wear of the tensioners and water pump.
11. Verification: Rotate the crankshaft pulley through two full revolutions. Crucially, re-check that all timing marks (on pulleys and casing) align perfectly. If they don't, you must repeat the belt installation process.
12. Reassembly: Replace the crank pulley, tightening the Ribe bolts securely. Install the cam cover, tightening its bolts. Re-fit the auxiliary belt and tension it correctly. Reassemble engine mounts, ensuring all bolts are tightened to the correct specifications.
13. Final Checks: Replace the wheel arch liner and road wheel. Refill the coolant system with a 50/50 mix of antifreeze and water. Start the engine and listen for any unusual noises. Whining might indicate an overtightened belt, while knocking could suggest a loose belt. Adjust tension if necessary.

Tips for a Smoother Cambelt Change:

• Engine Movement: Utilise the jacks to tilt and move the engine within the engine bay to gain better access to specific bolts and components.
• Cam Locking: While not always strictly necessary if the cams don't move, using cam locking tools can provide extra security and peace of mind, especially if you're unsure about the engine's static position.
• Tensioning is Key: Getting the belt tension right is crucial. Refer to manufacturer specifications or reliable guides for the correct tension.
• Take Your Time: This is not a job to be rushed. Allow ample time, work methodically, and double-check each step.

Frequently Asked Questions (FAQs)

Q1: How often should the cambelt on a Fiat Coupé 20v Turbo be replaced?

A1: While specific intervals can vary based on model year and usage, a general recommendation for cambelt replacement is typically every 60,000 to 80,000 miles or every 5-7 years, whichever comes first. Always consult your owner's manual or a reputable service guide for the precise interval for your vehicle.

Q2: Can I replace just the cambelt without changing the water pump and tensioners?

A2: It is strongly recommended to replace the water pump and tensioners at the same time as the cambelt. These components often have a similar lifespan to the cambelt, and accessing them requires significant labour. Replacing them concurrently saves on future labour costs and ensures all critical timing components are renewed.

Q3: What happens if the cambelt breaks?

A3: In an interference engine, like the Fiat Coupé 20v Turbo's, a broken cambelt will cause the engine to stop running immediately. More critically, without the belt synchronising the camshafts and crankshaft, the pistons can collide with the open valves, causing severe internal engine damage, often leading to a complete engine rebuild.

Q4: What are Ribe bits?

A4: Ribe bits are a type of internal spline drive fastener, similar to Torx but with more flutes and a rounded profile. They are often used in European automotive applications for their strength and ability to withstand high torque. If you don't have Ribe bits, a correctly sized Torx bit can sometimes be used as a substitute, but using the correct tool is always preferable.

Conclusion

The Fiat Coupé 20v Turbo remains a desirable car for its performance and unique styling. Understanding its power delivery and committing to essential maintenance, such as the cambelt replacement, is key to enjoying this Italian icon for years to come. While the cambelt job is complex, with the right tools, patience, and attention to detail, it is a manageable task for the determined DIY mechanic.

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