1966 MERCURY MONTCLAIR

Typical onset: 80,000-120,000 mi or unknown with neglect

Symptoms: Hard starting when warm, Rough idle with occasional backfiring, Rattling from front of engine on cold starts, Loss of power and poor fuel economy, Check timing and it jumps around or won't stay set

Fix: Replace timing chain, gears, and oil slinger. With the FE engine, this requires pulling the radiator and damper — budget 6-8 hours labor. Use a double-roller chain kit, not the original nylon-toothed gear setup that grenades. While you're in there, replace the fuel pump eccentric and cam button.

Estimated cost: $800-1,400

Symptoms: Flooding and fuel smell after sitting, Black smoke on acceleration, Hesitation or stumble when you punch it, Hard starting with pumping required, Raw fuel dripping from carb base

Fix: These Autolite 4100 4-barrels or Holley units have brass floats that develop pinholes and accelerator pump diaphragms that rot after decades. Full rebuild kit plus ultrasonic cleaning runs 3-4 hours. Sometimes the carb body is warped — check with straight edge or plan for replacement.

Estimated cost: $400-700

Symptoms: Clunking over bumps, Wandering steering that requires constant correction, Uneven tire wear on inside edges, Steering wheel off-center after turns, Front end shimmy at 45-55 mph

Fix: Upper and lower control arm bushings turn to dust, along with strut rod bushings and idler arm. Plan to replace the whole front end kit — bushings, ball joints, tie rod ends, idler arm. With a lift and press, figure 8-10 hours. Alignment mandatory afterward.

Estimated cost: $1,200-1,800

Symptoms: Brake pedal slowly sinks to floor when held at stop, Loss of braking after several applications, Fluid weeping from rear of master cylinder, Spongy pedal that doesn't firm up with bleeding, Fluid level drops without visible external leaks

Fix: Single-reservoir master cylinders leak internally past piston seals. Replacement is straightforward — 2 hours including bench bleeding and system bleed. Strongly recommend upgrading to dual-reservoir unit for safety, which requires adapter and different brake lines. Inspect wheel cylinders and flex hoses while you're bleeding.

Estimated cost: $300-600

Symptoms: Bubbling paint at bottom of rear quarter panels, Soft spots in trunk floor near wheel wells, Water in trunk after rain, Rust visible from underneath at rear frame rails, Filler visible in lower quarters from previous repairs

Fix: These cars trap moisture in the trunk gutters and lower quarters. Rust repair requires cutting out metal and welding patches — don't fall for Bondo over rust. Expect 12-20 hours depending on extent. Reproduction panels are scarce for Montclair-specific trim, so fabrication is common. Surface rust on frame is manageable; structural perforation requires serious work.

Estimated cost: $2,000-4,500

Typical onset: 70,000-100,000 mi

Symptoms: Transmission fluid on driveway centered under bellhousing, Slipping on 1-2 shift when cold, Delayed engagement into Drive or Reverse, Rough or harsh shifts, Fluid smells burnt or is dark brown

Fix: The C6 is bulletproof but front pump seal leaks are common with age. Requires transmission removal — 6-8 hours. While it's out, replace modulator, filter, and all seals. If fluid is burnt, plan for a full rebuild as clutch packs are likely cooked. Band adjustments should be checked during reassembly.

Estimated cost: $800-1,400

Symptoms: Ammeter shows discharge at idle, Dimming lights at idle that brighten with RPM, Squealing or grinding from generator, Battery keeps dying, Flickering dash lights, Burning smell from generator area

Fix: Most '66 Montclairs still have generators unless converted. Bearings wear out and brushes need replacement. Rebuild runs 2-3 hours, or swap to alternator conversion (recommended) at 4-5 hours including brackets and wiring changes. External voltage regulators fail and cause overcharging — test output before frying electrical components.

Estimated cost: $400-900