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Top issues
16 known problems · 4 high
high
Chassis and body rust
All engines
high
Timing chain guide failure (single-row chain)
2.4L 22R petrol (carb)
high
Timing belt neglect
2.4L 2L diesel (NA)
At this odometer
See which of this car's known problems are due at that mileage, which should already have been dealt with, and what's coming up.
Generations
Best and worst years for the Toyota Hilux →
Before: Hilux 3rd gen (N30/N40, 1978-1983)
After: Hilux 5th gen (N80/N90/N100, 1988-1997)
Price (AUD)
$6k-$30k+ (clean 4x4 dual-cabs and tidy diesels command strong money)
Body styles
Single Cab, Xtra Cab (extended cab), Dual Cab
Drivetrain
RWD, 4WD part-time (dual-range, solid front axle)
Origin
Japan
Built in
Japan
Overview
The 4th-generation Hilux (sold here as RN-series carb petrol, YN-series 4Y petrol and LN-series 2L/2L-T diesel) is the truck that built the Hilux's bulletproof legend in Australia. This is the generation that introduced the proper solid-front-axle dual-range 4WD in August 1983, turning the Hilux into a genuine compact 4x4 and the backbone of farm, mine and tradie fleets. Bodies came as single cab, Xtra Cab and dual cab, with cab-chassis and tray-back tradie versions everywhere. Mechanically it is old-school and honest: leaf springs all round (4x4s got front leaf and a solid axle), recirculating-ball steering, simple carburettor or mechanical-injection diesel engines and 4- or 5-speed manuals with the odd 4-speed auto. The engine you pick matters enormously. The 22R 2.4 carb petrol is a tough, easy-to-fix unit let down only by the 1983-on single-row timing chain and its plastic guides. The 4Y 2.2 petrol (from ~1985-86) is the lighter workhorse motor. The 2L 2.4 naturally-aspirated diesel is slow but extremely durable; the 2L-T turbo-diesel adds welcome torque but is infamous for cracking cylinder heads. After 35-40 years, condition, rust and service history matter far more than the badge - these are now appreciating 4x4 classics, but a rusty chassis or tired engine can be a money pit. Buy the best body you can find and assume a full consumables refresh.
Engines & variants
2.4L 22R petrol (carb)
Engine
SOHC 8-valve carburettor I4 - the classic 'bulletproof' Hilux petrol
Engine code
22R
Config
I4 NA
Displacement
2366cc
Power
~74kW @ 4800rpm
Torque
~185Nm @ 2800rpm
Drivetrain
RWD / Part-time 4WD (dual-range)
Economy
11-14 L/100km real world
Tow (braked)
1500-2250kg (model dependent)
Tow (unbraked)
750kg
Transmission
4MT, 5MT, 4AT
Timing chain / belt / gear
Single-row chain (1983-on) with plastic guides - inspect/replace ~150,000km
Pros
- Iconic tough, simple carburettor four - easy to understand and fix
- Cheap, plentiful parts and huge aftermarket support
- Will run on poor fuel and tolerate neglect
- Strong low-down torque for a 2.4 petrol
- Carburettor means no fragile electronics to fail with age
Cons
- 1983-on single-row timing chain with plastic guides is the known weak point
- Thirstier than the diesels, especially in the heavier 4WD
- Carburettor needs occasional tuning/rebuild as it ages
- Iron block / alloy head means overheating risk if cooling neglected
- Modest performance by modern standards
Known problems
high
Timing chain guide failure (single-row chain)
From 1983 the 22R used a single-row timing chain with plastic guides. As the chain stretches, the tensioner runs out of travel and the chain slaps the plastic guide, which cracks and disintegrates. A rattling/chattering noise on start-up is the warning. In the worst case the loose chain saws through the timing-cover water jacket and lets coolant into the sump, killing the engine.
Fix: Replace the timing chain, tensioner and guides - fit a double-row chain conversion or upgraded steel/metal-backed guides as the durable fix. Do not ignore start-up rattle.
medium
Head gasket / overheating (iron block, alloy head)
The cast-iron block with aluminium head expands at different rates; a tired radiator, perished hoses or a failed thermostat can let it overheat and blow the head gasket or warp the head.
Fix: Keep the cooling system fresh - recore/replace radiator, new hoses, thermostat and water pump. Head gasket and skim if already compromised.
low
Carburettor wear and cold-running issues
After decades the carburettor diaphragms, gaskets and automatic choke wear, causing hard cold starts, hesitation, flooding or poor economy.
Fix: Carburettor rebuild kit and tune by someone who still knows carbs; replace fuel lines and check for ethanol-related deterioration.
2.2L 4Y petrol (carb)
Engine
OHV pushrod 8-valve carburettor I4 - workhorse light-commercial petrol
Engine code
4Y / 4Y-C
Config
I4 NA
Displacement
2237cc
Power
~69kW @ 4400rpm
Torque
~179Nm @ 2400rpm
Drivetrain
RWD / Part-time 4WD (dual-range)
Economy
11-13 L/100km real world
Tow (braked)
1500-2250kg (model dependent)
Tow (unbraked)
750kg
Transmission
4MT, 5MT
Timing chain / belt / gear
Timing chain (pushrod OHV) - long-lived, inspect at high km
Pros
- Simple, low-stress pushrod engine - very forgiving
- Long-lived timing chain, no belt to snap
- Cheap to run and service, parts still available
- Offered in 2WD and 4WD bodies
- Good torque spread for tradie/light-tow duty
Cons
- Less power and refinement than the 22R
- Carburettor ageing issues like all engines of the era
- Can develop top-end oil leaks (rocker cover/valley) with age
- Modest performance loaded or towing
Known problems
low
Carburettor and choke wear
The 4Y-C carburettor and automatic choke wear with age, causing hard cold starts, hesitation, surging and poor economy.
Fix: Carburettor rebuild/clean and proper tune; replace perished fuel hoses.
medium
Valve guide / top-end oil consumption
At high km the 4Y can burn oil past worn valve guides/seals and rings, showing as blue smoke on start-up and a thirst for oil.
Fix: Valve stem seals and a top-end refresh, or a budget reconditioned long-motor - these engines are cheap to rebuild.
low
Oil leaks (rocker cover / front seals)
Decades-old gaskets and seals weep oil from the rocker cover, timing cover and crank seals.
Fix: Replace gaskets and seals during routine service - straightforward DIY.
2.4L 2L diesel (NA)
Engine
SOHC naturally-aspirated indirect-injection 2.4L diesel I4
Engine code
Config
I4 diesel (NA)
Displacement
2446cc
Power
~55kW @ 4000rpm
Torque
~155Nm @ 2400rpm
Drivetrain
RWD / Part-time 4WD (dual-range)
Economy
8-10 L/100km real world
Tow (braked)
1500-2250kg (model dependent)
Tow (unbraked)
750kg
Transmission
4MT, 5MT, 4AT
Timing chain / belt / gear
Toothed timing belt - replace every 100,000km / 6-8 years
Pros
- Simple mechanical indirect-injection diesel - no electronics to fail
- Frugal and very long-lived bottom end with regular oil changes
- Will start and run on poor fuel; ideal remote/farm engine
- Cheaper to run than the petrols
- Cooler-running and tougher than the turbo 2L-T
Cons
- Genuinely slow - struggles loaded, on hills and at highway speed
- Noisy and agricultural by modern standards
- Timing belt (not chain) - must be replaced on schedule
- Glow plugs and injectors wear with very high km
- Smoky if injection pump/injectors are tired
Known problems
medium
Cylinder head cracking (overheat related)
The 2L head can crack between valve seats if the engine is overheated (blocked radiator, low coolant) - less prone than the turbo 2L-T but still a known indirect-injection diesel weakness.
Fix: Maintain cooling religiously; if cracked, replace/recondition the head. Pressure-test the head when buying.
medium
Injection pump and injector wear
The mechanical injection pump and injectors wear at very high km, causing hard starting, white/black smoke and lost power.
Fix: Diesel-specialist pump and injector recondition; many examples have already had this done - ask for records.
high
Timing belt neglect
Unlike the chain-driven petrols, the 2L diesel runs a rubber timing belt. A snapped belt on these can cause valve-to-piston damage, and decades-old belts of unknown age are a real risk.
Fix: Replace timing belt, tensioner and water pump on schedule (or immediately if history is unknown).
2.4L 2L-T turbo diesel
Engine
SOHC turbocharged indirect-injection 2.4L diesel I4 (LN65 4WD)
Engine code
Config
I4 turbo diesel
Displacement
2446cc
Power
~62kW @ 4000rpm
Torque
~186Nm @ 2200rpm
Drivetrain
RWD / Part-time 4WD (dual-range)
Economy
8.5-11 L/100km real world
Tow (braked)
1500-2250kg (model dependent)
Tow (unbraked)
750kg
Transmission
5MT, 4AT
Timing chain / belt / gear
Toothed timing belt - replace every 100,000km / 6-8 years
Pros
- Noticeably more torque and drivability than the NA 2L
- Still frugal for the performance on offer
- Sought-after LN65 4WD dual-cabs are collectible
- Mechanical injection - simple and field-serviceable
- Good torque for towing/touring relative to the NA diesel
Cons
- Infamous for cracking cylinder heads - the defining weakness
- Heat-stressed by the turbo, so cooling must be perfect
- Timing belt engine - strict replacement intervals
- Turbo, injectors and pump all wear at high km
- Many surviving examples have had at least one head replaced
Known problems
high
Cracked cylinder head
The 2L-T is notorious for cracking its cylinder head between the valve seats and pre-combustion chambers - the extra heat and cylinder pressure from the turbo, combined with any cooling-system weakness, causes overheating, coolant loss, white smoke and combustion gases in the coolant. Many enthusiasts steer clear of the 2L-T purely because of this.
Fix: Replace with a reconditioned head (uprated/repaired castings exist) and keep cooling immaculate - new radiator, fan, thermostat, coolant. Pressure-test the head and do a combustion-gas (block) test before buying.
medium
Turbo wear / oil feed issues
The turbo bearings wear with age and heat; a hot shutdown without idle-down can coke the oil feed, leading to shaft play, smoke and lost boost.
Fix: Rebuild or replace the turbo; service the oil feed/return lines and let it idle down after hard runs.
medium
Injection pump and injector wear
Mechanical pump and injectors wear at high km causing hard starting, smoke and lost power.
Fix: Diesel-specialist pump and injector recondition; ask for service history.