Essential guide for Valiant owners to keep their classic Aussie cars running smoothly
The Chrysler Valiant is an iconic Australian classic, loved for its durability, versatility, and motorsport heritage. However, like any car over 40–50 years old, these vehicles can develop common faults if not properly maintained. Understanding these issues — and how to fix them — is key to keeping your Valiant reliable and roadworthy.
Here’s a detailed guide to the most common Valiant problems and practical solutions.
1. Engine Oil Leaks
Where They Happen
- Rear main seal
- Valve cover gaskets
- Oil pan gasket
Why It Happens
- Age and heat cycles cause seals and gaskets to dry out
- Improper installation during previous maintenance
How to Fix
- Replace gaskets and seals with modern aftermarket equivalents
- Use high-quality engine oil to maintain lubrication and reduce leaks
- Inspect and tighten bolts to correct torque specifications
Pro Tip: Regularly check oil levels to prevent low-oil damage, especially on Hemi Six and V8 engines.
2. Cooling System Issues
Common Problems
- Radiator leaks
- Water pump failure
- Blocked or corroded hoses
Why It Happens
- Age-related corrosion and wear
- Original radiators not designed for today’s hot conditions
- Overheating from spirited driving or modifications
How to Fix
- Upgrade to aluminium radiator for better cooling
- Replace water pump and hoses with modern equivalents
- Consider electric fan conversion for consistent airflow
Tip: A well-maintained cooling system is critical for Hemi Six performance and longevity.
3. Power Steering Failure
Symptoms
- Hard steering at low speeds
- Leaks from power steering pump or rack
Why It Happens
- Original power steering pumps wear out over time
- Hoses can crack and leak fluid
How to Fix
- Replace pump, hoses, and fluid
- Inspect and rebuild steering rack if necessary
- Upgrade to modern high-pressure hoses for reliability
Cost Impact: Can be expensive if ignored — failing racks may require a full rebuild.
4. Transmission Problems
Common Issues
- Slipping automatic transmissions (e.g., 727 or Torqueflite)
- Hard shifts or delayed engagement
Why It Happens
- Worn clutch packs in the transmission
- Old or contaminated fluid
- Lack of regular servicing
How to Fix
- Flush and replace transmission fluid regularly
- Rebuild or replace worn internal components
- Consider upgrading to performance or overdrive units for longevity
Pro Tip: Automatic transmissions benefit from periodic cooler upgrades to handle high loads.
5. Rust and Body Corrosion
Common Areas
- Sills and rocker panels
- Wheel arches and guards
- Floor pans and boot floor
Why It Happens
- Exposure to Australian weather and salted roads
- Older protective coatings failing
How to Fix
- Sandblast or cut out rusted sections
- Weld in replacement panels (genuine or aftermarket)
- Apply rust-proof coatings and paint protection
Tip: Regular inspections prevent rust from spreading and maintain vehicle value.
6. Electrical Gremlins
Symptoms
- Flickering lights or gauges
- Starter motor issues
- Charging system failure
Why It Happens
- Aging wiring insulation
- Corroded connections
- Original alternators and starters wearing out
How to Fix
- Inspect and replace old wiring and connectors
- Upgrade to modern alternators for improved reliability
- Use dielectric grease on connections to prevent corrosion
Fun Fact: Many classic Valiants have been upgraded with 12V electrical systems for improved performance.
7. Suspension and Steering Wear
Common Problems
- Worn bushes and ball joints
- Sagging springs
- Loose steering
Why It Happens
- Decades of driving and heavy loads
- Original suspension components reaching end-of-life
How to Fix
- Replace worn bushes with polyurethane upgrades
- Fit modern shocks and springs to improve handling
- Align the suspension after work to ensure safe driving
Tip: A well-sorted suspension improves daily driving comfort and high-speed stability.
8. Fuel System Troubles
Common Issues
- Carburetor blockages
- Fuel pump failure
- Fuel line corrosion
Why It Happens
- Ethanol in modern fuel can corrode older components
- Sediment buildup in tanks
How to Fix
- Rebuild carburetors and fuel pumps
- Replace old fuel lines with modern rubber or braided alternatives
- Add fuel stabilizers if storing the car for long periods
Final Thoughts
While the Chrysler Valiant is known for its robust engineering, classic cars require regular inspection, maintenance, and occasional repairs. By addressing engine leaks, cooling, transmission, rust, and suspension, owners can enjoy a reliable, fun, and collectible vehicle for decades to come.
Proper care not only preserves performance and reliability but also ensures your Valiant remains a prized classic in Australian motoring history.