The 2018 Daihatsu Hijet with the 0.66L KF three-cylinder is a micro-commercial workhorse built for Japanese Kei regulations. While generally reliable for light-duty use, these engines are stressed when overloaded or run hard, leading to premature valvetrain wear and head gasket issues, especially in commercial fleets.
Lifter/Tappet Noise and Wear
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Mechanical ticking or tapping from valve cover, especially cold start, Noise worsens under load or acceleration, Loss of power if wear progresses, Check engine light for cam/crank correlation codes in severe cases
Fix: Replace all lifters/tappets along with camshaft inspection. This is a 6-8 hour job due to tight engine bay access. Often find cam lobe wear if caught late, adding another 2-3 hours. Poor oil change intervals accelerate this dramatically.
Estimated cost: $1,200-2,400
Head Gasket Failure
Occasional · high severityTypical onset: 80,000-130,000 mi
Symptoms: White smoke from exhaust, especially after warm-up, Coolant loss with no visible leaks, Overheating under load or climbing grades, Milky oil on dipstick or oil cap, Rough idle and misfires
Fix: Head gasket replacement requires 10-14 hours due to tight access and ancillary removal. Always resurface or replace the head (common warping on these thin-deck engines). Timing chain inspection mandatory while in there. This engine doesn't tolerate overheating.
Estimated cost: $2,800-4,200
Timing Chain Stretch and Tensioner Failure
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: Rattling noise from timing cover on startup that fades after 5-10 seconds, Check engine light with cam/crank position sensor correlation codes (P0016, P0017), Hard starting or no-start if chain jumps time, Rough running and loss of power
Fix: Replace timing chain, guides, and tensioner as a complete kit. 8-10 hour job with front cover removal. If chain has jumped, expect valve-to-piston contact requiring head work (add 6-8 hours). This is an interference engine—catastrophic if chain breaks.
Estimated cost: $1,800-3,500
Transmission Oil Cooler Line Leaks
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Transmission fluid spots under vehicle, typically pink or red, Burnt smell from engine bay, Transmission slipping or delayed engagement when fluid is low, Fluid mixing with coolant if internal cooler fails (rare but catastrophic)
Fix: Replace corroded hard lines and cooler assembly. The lines run along the frame rail and rust through from road salt and debris. 3-5 hours including trans fluid flush. Check radiator-mounted cooler for internal leaks while you're in there.
Estimated cost: $600-1,200
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Visible wobble of crankshaft pulley when engine running, Serpentine belt shredding or unusual wear pattern, Vibration felt through chassis at idle, Squealing or grinding from front of engine
Fix: Replace harmonic balancer/crankshaft pulley. The rubber isolator separates from the hub on these small high-revving engines. 2-3 hour job, requires pulley puller and proper torque spec on reinstall. Leaving it risks damaging the crankshaft snout.
Estimated cost: $400-750
Transmission Mount Collapse
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from park to drive or reverse, Excessive engine movement visible when revving, Vibration through shifter and floorboard, Transmission feels like it's 'dropping' during acceleration
Fix: Replace transmission mount (often the rear mount fails first). 1.5-2 hours to access and swap. The Hijet's transverse engine layout puts a lot of torque on these small rubber mounts. Inspect engine mounts at the same time.
Estimated cost: $250-500
Buy one if you need a city runabout or farm truck and will maintain it religiously—skip it if you want highway capability or plan to abuse it commercially.
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.