The 2016 Daihatsu Hijet with its 0.66L KF engine is a workhorse kei truck that's generally reliable for commercial use, but the tiny displacement motor works hard and shows predictable wear patterns in high-mileage or overloaded scenarios.
Lifter/Tappet Noise and Wear
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Cold-start ticking that may persist after warmup, Loss of power on acceleration, Check engine light with misfire codes, Metallic tapping from valve cover area
Fix: The KF engine's hydraulic lifters wear unevenly, often requiring full set replacement. Job involves removing camshaft(s), inspecting cam lobes, replacing all lifters as a set. 6-8 hours labor for experienced tech due to cramped engine bay access.
Estimated cost: $1,200-2,200
Head Gasket Failure
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Overheating under load, Milky oil on dipstick or cap, Rough idle and misfires
Fix: These small three-cylinder engines run hot under constant load. Head gasket failure typically requires cylinder head removal, resurfacing, valve job inspection, and new head bolts. Often combined with timing chain inspection. 10-14 hours labor including machine shop time.
Estimated cost: $2,800-4,500
Timing Chain Stretch and Guide Wear
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: Rattling noise on cold start that fades, Check engine light with timing correlation codes, Hard starting or no-start conditions, Metallic scraping from front of engine
Fix: KF engines use timing chain but guides wear and chain stretches with poor oil change intervals or sustained high RPM use. Requires front engine disassembly, new chain, guides, tensioner, and often water pump while you're in there. 8-10 hours labor.
Estimated cost: $1,800-3,200
Transmission Oil Cooler Line Leaks
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: ATF puddles under front of vehicle, Transmission slipping or harsh shifts when hot, Low transmission fluid level, Burnt ATF smell
Fix: The cooler lines corrode at fittings or develop pinhole leaks from road salt and debris. Often requires replacing both feed and return lines. Access is tight but straightforward. 2-3 hours labor plus fluid refill and system flush recommended.
Estimated cost: $400-800
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Visible wobble on crankshaft pulley at idle, Squealing belts that can't be tensioned properly, Vibration felt through whole vehicle, Accessory belt walking off pulleys
Fix: The rubber isolator in the harmonic balancer separates from the hub, causing pulley wobble. Requires crankshaft pulley puller and reinstallation tool. Often discovered during serpentine belt service. 2-3 hours labor.
Estimated cost: $450-750
Transmission Mount Failure
Common · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunking when shifting from Park to Drive, Excessive engine movement visible when revving, Vibration through shifter and floorboard, Drivetrain lash on acceleration
Fix: The rear transmission mount fatigues and tears, especially on trucks used for hauling. Requires supporting transmission, removing old mount hardware, installing new. 1.5-2 hours labor. Often done with engine mounts as preventive set.
Estimated cost: $250-450
Buy one if maintenance records are solid and you understand it's a commercial-grade mini-truck that demands frequent servicing, but avoid high-mileage examples without documentation of timing chain and head gasket work.
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.