The 2020 Daihatsu Hijet uses the proven KF 0.66L three-cylinder engine, a robust kei-truck platform with excellent longevity when maintained. Most issues stem from hard commercial use, heat stress on the small-displacement engine, and age-related transmission wear on high-mileage units.
Timing Chain Tensioner and Guide Wear
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: rattling noise on cold starts that fades when warm, metallic ticking from front of engine, check engine light with cam/crank correlation codes
Fix: Replace timing chain, tensioner, guides, and upper chain rail. On the KF engine this is front-access but labor-intensive due to cramped engine bay. Expect 6-8 hours labor. Always replace water pump and front main seal while you're in there.
Estimated cost: $1,200-2,000
Hydraulic Valve Lifter Noise and Failure
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: persistent ticking or tapping at idle, noise worsens with low oil level or extended oil change intervals, loss of power on aggressive acceleration
Fix: KF engines use hydraulic lifters that collapse when oil passages clog or oil quality degrades. Single lifter replacement is 3-4 hours; full set replacement (recommended) is 5-6 hours including valve cover removal and camshaft access. Oil flush and quality synthetic oil often quiets marginal lifters temporarily.
Estimated cost: $800-1,400
Head Gasket Failure from Overheating
Occasional · high severityTypical onset: 80,000-150,000 mi
Symptoms: white smoke from exhaust, overheating especially under load or uphill, coolant loss with no visible leaks, milky oil on dipstick or oil cap
Fix: The tiny KF engine runs hot under sustained load, and coolant neglect or fan failures accelerate head gasket breakdown. Requires cylinder head removal, resurfacing, new gasket set, and timing components. Machine work for head adds $150-250. Total labor 8-10 hours. Check for warped head—common if driven while overheating.
Estimated cost: $1,800-3,200
Transmission Oil Cooler Line Leaks
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: transmission fluid spots under vehicle, burnt smell from transmission area, erratic shifting or slipping when hot
Fix: Steel lines and rubber hoses to the external transmission cooler corrode or crack, especially on rust-belt trucks. Lines are separate from radiator on most Hijets. Replace both feed and return lines as a pair, flush cooler. 2-3 hours labor. Catching this early prevents transmission damage.
Estimated cost: $400-700
Transmission Mount Deterioration
Common · low severityTypical onset: 50,000-90,000 mi
Symptoms: clunking when shifting from park to drive, excessive vibration at idle, visible engine/trans movement when revving in park
Fix: Rubber transmission mount fatigues from constant commercial use and engine vibration. Straightforward replacement, 1.5-2 hours labor. Inspect engine mounts simultaneously—they often fail together. Delaying this causes accelerated wear on CV axles and exhaust hangers.
Estimated cost: $250-450
Harmonic Balancer Rubber Degradation
Occasional · medium severityTypical onset: 100,000-160,000 mi
Symptoms: vibration that increases with RPM, visible separation between outer ring and hub, serpentine belt wear or misalignment, wobbling pulley visible with engine running
Fix: The rubber damper in the crank pulley deteriorates with heat cycles. Requires balancer puller and sometimes pulley installer tool. 2-3 hours labor. If the balancer separates while driving, it destroys the serpentine belt and leaves you stranded. Inspect at every timing service.
Estimated cost: $400-650
Excellent used buy if maintained and under 100k miles—bulletproof utility with low running costs, but avoid high-mileage commercial units with deferred maintenance.
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.