The 2007 Pajero Mini's 660cc turbocharged 4A30T engine is a hardworking kei-class mill that suffers from typical small-displacement turbo stresses—oil starvation issues, head gasket failures, and lifter noise are the hallmarks. The 4-speed auto transmission is generally robust but heat and fluid neglect accelerate cooler and mount failures.
Hydraulic Lifter Noise and Failure
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Loud ticking or tapping from valve cover at cold start that may persist when warm, Loss of power and rough idle as lifters collapse, Check engine light with misfire codes in severe cases
Fix: Replace all lifters/tappets and inspect camshaft lobes for wear—often requires cylinder head removal for proper access. Budget 8-12 labor hours if head comes off, 5-7 hours if you can service in-situ (rare). Always replace cam seals and valve cover gasket during this job.
Estimated cost: $1,200-2,400
Cylinder Head Gasket Failure
Occasional · high severityTypical onset: 90,000-150,000 mi
Symptoms: White smoke from exhaust, especially on cold start, Coolant consumption without visible leaks, Overheating or erratic temperature gauge readings, Milky oil on dipstick or oil cap (advanced failure)
Fix: Full head gasket replacement requires cylinder head removal, resurface at machine shop (typically $150-250), new head bolts, and timing belt replacement while you're in there. Figure 10-14 labor hours total. Small turbocharged engines run hot and thin gaskets give up under boost and heat cycles.
Estimated cost: $2,500-4,200
Transmission Oil Cooler Line Leaks and Cooler Failure
Common · medium severityTypical onset: 80,000-140,000 mi
Symptoms: ATF puddles under front of vehicle or near radiator, Transmission slipping or delayed engagement when fluid runs low, Burnt ATF smell if cooler clogs and fluid overheats
Fix: Replace transmission oil cooler (external unit or integrated in radiator on some variants) and both hard lines plus rubber hoses. Cooler corrosion is the usual culprit. Flush transmission afterward. 3-5 labor hours depending on cooler location and line routing.
Estimated cost: $600-1,200
Transmission Mount Collapse
Occasional · low severityTypical onset: 100,000-160,000 mi
Symptoms: Excessive driveline clunk on throttle tip-in or deceleration, Vibration at idle that smooths out at higher RPM, Visible sag or cracking in rubber mount when inspected from below
Fix: Replace transmission mount—straightforward job but access can be tight. Support transmission with jack, unbolt old mount, swap in new. 1.5-2.5 labor hours. OEM Mitsubishi mounts last longest; aftermarket rubber hardens faster in hot climates.
Estimated cost: $250-500
Harmonic Balancer (Crankshaft Pulley) Deterioration
Occasional · high severityTypical onset: 100,000-180,000 mi
Symptoms: Squealing or chirping from front of engine that worsens with RPM, Visible wobble or separation of outer pulley ring from hub, Serpentine belt wear or repeated belt throwing, Engine vibration that increases with speed
Fix: Replace harmonic balancer assembly. Rubber damper separates or hardens over time, especially in heat. Requires crankshaft bolt removal (often seized or one-time-use torque-to-yield), harmonic balancer puller, and precise reinstallation. 2-3 labor hours. Timing belt interference possible if pulley comes apart while driving.
Estimated cost: $400-750
Camshaft Lobe Wear from Oil Starvation
Rare · high severityTypical onset: 120,000+ mi
Symptoms: Severe lifter noise that doesn't quiet down with new lifters, Misfires and rough running under load, Metal shavings in oil or on magnetic drain plug, Loss of compression in one or more cylinders
Fix: Replace camshaft and all lifters, inspect rocker arms and cylinder head for scoring. Often tied to extended oil change intervals or running low on oil—turbo engines are unforgiving. Head removal required, add machining if journals are damaged. 12-16 labor hours including reassembly and timing belt.
Estimated cost: $2,800-5,000
Buy only with documented oil changes and recent timing belt service—neglected examples become money pits fast, but well-maintained Pajero Minis are charming, capable little trucks that can hit 200k+ miles.
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.