Twice-yearly servicing forms the second level of factory preventive maintenance for 1946–1948 Ford V8, Mercury V8 and Lincoln V8 and V12 vehicles. While the 1000-mile service focuses on regular inspection and adjustment, the twice-yearly service is more comprehensive and is designed to prepare the vehicle for changing seasonal conditions while identifying deeper mechanical wear.- What is a twice-yearly service? A more detailed inspection and maintenance routine carried out every six months or approximately 5000 miles.
- What does it include? Engine checks, system tightening, cooling system service, ignition inspection and full vehicle condition checks.
- Why is it important? It prepares the vehicle for seasonal changes and identifies wear before it leads to failure.
This level of servicing goes beyond routine checks and includes more detailed inspection, tightening and corrective maintenance across all major systems. It ensures that components affected by extended use, temperature changes and environmental conditions continue to operate reliably and safely.
The twice-yearly service includes a broader range of checks and maintenance tasks that ensure all major systems remain in correct working condition.
Engine Maintenance & Inspection Checks
- Check cylinder compression to identify internal engine wear
- Tighten cylinder head nuts to correct specification
- Tighten intake manifold connections to prevent leaks
- Inspect engine for signs of oil leaks or deterioration
Cooling System Maintenance Checks
- Drain and flush cooling system if contamination or rust is present
- Inspect radiator for blockage or debris
- Check all hoses for cracking, swelling or deterioration
- Tighten hose connections and replace where required
Fuel System Maintenance Checks
- Inspect fuel lines for leaks, wear or loose fittings
- Clean fuel pump sediment chamber
- Check carburetor operation and ensure correct fuel delivery
Ignition System Maintenance Checks
- Remove, clean and inspect spark plugs
- Set spark plug gap to correct specification
- Inspect distributor components for wear or contamination
- Check ignition timing and adjust if required
Electrical System Maintenance Checks
- Inspect and tighten all primary wiring connections
- Check generator operation and charging performance
- Inspect battery condition, clean terminals and ensure secure mounting
- Test operation of all lighting and electrical controls
Drive Components & General Mechanical Checks
- Inspect and adjust fan and generator belts
- Replace belts showing signs of wear or cracking
- Check operation of moving components for abnormal noise or resistance
Brake, Clutch & Control System Checks
- Inspect brake system operation and adjust where required
- Check clutch free play and adjust if necessary
- Inspect handbrake operation and ensure correct holding ability
General Vehicle Condition Checks
- Inspect vehicle for loose fittings, wear or damage
- Check operation of wipers and controls
- Lubricate hinges, locks and moving fittings as required
Twice-yearly servicing provides a deeper level of maintenance that complements the regular 1000-mile schedule. It ensures that wear caused by extended use is identified and corrected before it leads to mechanical failure, while also preparing the vehicle for changes in operating conditions.
By following both service intervals as intended, owners and restorers can maintain consistent performance, reduce unexpected faults and preserve the long-term reliability of these vehicles.
While this guide helps trouble shoot common problems and remedies, the 1946-1948 Ford, Mercury and Lincoln V8 Workshop Manual available from Car Manuals Direct includes all the original specifications, adjustment, torque settings and repair procedures used by Ford, Mercury and Lincoln mechanics.
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Source
Information compiled from period factory service literature.
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