The 1972 Plymouth Scamp is Chrysler's A-body compact with legendary slant-six or small-block V8 power. Mechanically simple and durable, but rust and age-related wear on 50+ year-old components are the real enemies.
Timing Chain Stretch and Gear Wear (Slant-Six 198/225)
Common · medium severityTypical onset: 80,000-150,000 mi
Symptoms: Hard starting when cold, needs excessive cranking, Rough idle that smooths out after warmup, Rattling noise from timing cover on cold starts, Loss of power and poor fuel economy
Fix: Replace timing chain, cam and crank gears, and tensioner. Slant-six requires removing radiator and possibly motor mounts to access front cover. Budget 4-6 hours labor. Original nylon-toothed cam gears fail predictably—upgrade to all-metal.
Estimated cost: $400-750
Torsion Bar Corrosion and Failure
Common · high severitySymptoms: One front corner sitting significantly lower than the other, Severe clunking over bumps on one side, Complete suspension collapse on one corner, Visible rust pitting or flaking on exposed torsion bar ends
Fix: Torsion bars rust from the inside out in salt-belt cars. Once failed, the bar must be replaced—no repair possible. Requires unloading suspension, removing LCA, and pressing out anchors. Very dangerous if one snaps while driving. 3-5 hours per side including alignment.
Estimated cost: $500-900
Upper Control Arm Bushing Deterioration
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking over bumps at low speeds, Wandering steering and poor returnability, Uneven tire wear on inner edges, Visible cracking or complete separation of rubber bushings
Fix: Original rubber bushings dry-rot after decades. Requires pressing out old bushings and installing new ones, or replacing entire UCA assemblies. Alignment mandatory afterward. 2-3 hours per side.
Estimated cost: $350-600
Carburetor Rebuilding Required (All Engines)
Common · medium severitySymptoms: Flooding and fuel smell after sitting, Stumbling or hesitation on acceleration, Black smoke from exhaust under load, Won't idle without foot on gas pedal, Fuel leaking from accelerator pump area
Fix: 50-year-old carbs (Holley 1920, Carter BBD, or AFB) have hardened gaskets, worn throttle shafts, and stuck power valves. Full rebuild with kit takes 3-4 hours including bench time and adjustment. Ethanol fuel accelerates deterioration.
Estimated cost: $300-550
Floor Pan and Trunk Floor Rust-Through
Common · high severitySymptoms: Visible daylight through driver/passenger floor, Soft or spongy feeling when stepping on floors, Water intrusion into interior after rain, Trunk floor completely gone around spare tire well, Seat mounting bolts pulling through weakened metal
Fix: Structural rust requiring welding in new floor pans. Complete floor replacement involves removing interior, seats, carpet, and cutting out old metal. Trunk floors fail around spare well and rear frame rails. Professional restoration work: 12-20 hours depending on severity.
Estimated cost: $1,500-3,500
Leaking Rear Main Seal (318/340 V8)
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Oil dripping from bellhousing bottom, Oil spots under car after overnight parking, Clutch slipping if manual transmission (oil-soaked), Gradual oil consumption increase
Fix: Rope-style rear main seals harden and shrink with age. Requires transmission and clutch/flywheel removal. On V8s, can sometimes be replaced with trans partially lowered, but proper job means full removal. 6-8 hours on manuals, 5-6 on automatics.
Estimated cost: $650-1,100
Water Pump Leakage and Bearing Failure
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Coolant dripping from weep hole below pump pulley, Squealing or grinding from front of engine, Wobbling water pump pulley, Overheating under load
Fix: Cast-iron pumps last well but seals fail after decades. Slant-six pumps accessible in 1.5-2 hours. V8 pumps slightly easier. Always replace thermostat and hoses while coolant is drained. Aftermarket pumps sometimes have shorter bearing life than original.
Estimated cost: $250-450
Buy a rust-free western car with maintenance records—mechanicals are cheap and simple, but rust repair costs more than the car's worth.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.