Always carry in sealed 5L containers. Label with date opened. Rotate stock every 6 months. If you find metal in the drained oil, do not restart the engine.

Mark filters with a black marker at home — write the date of the last change so you know which one is the fresh spare.

A cracked or glazed belt will slip before it snaps. Inspect tension and condition at every fuel stop. Carry a belt tension gauge if possible. Fitting takes 20 minutes with the right tools.

The 1HZ is notorious for head gasket failure when overheated. The warning signs are white exhaust smoke, coolant loss, and sweet smell from the exhaust. Stop the engine immediately. Never restart a suspected blown gasket.

A cracked manifold gasket is often heard before it fails completely — listen for a rhythmic tick at idle that disappears at revs. Carry high-temperature copper gasket spray to temporarily seal hairline cracks.

Never top up with plain water in an emergency without noting it — it dilutes inhibitor and raises freezing point. Re-check and correct the mix at the next opportunity. Distilled water only — bore or river water contains minerals that attack the alloy head.

The 1HZ thermostat is accessible and field-replaceable in under 30 minutes. Test: remove and drop in boiling water — it should open. If it stays shut, replace it. Never run without a thermostat — it upsets flow dynamics and can cause localised hot spots.

Squeeze the hoses when the engine is cold. They should feel firm but pliable — not hard, not spongy. A spongy hose has collapsed internally. Replace as a pair at each major service.

Mark the correct clamp size on each hose with a paint marker at home. In an emergency, a radiator hose can be temporarily repaired with duct tape and a hose clamp — reduce speed and monitor temperature constantly.

Check for coolant staining on the front of the engine at every stop. A water pump bearing failure produces a grinding noise at the pump pulley. Carry gasket sealant — some 1HZ pumps use sealant rather than a gasket.

Use only as a last resort. Stop-leak can block the heater matrix and narrow passages in the oil cooler if overused. Flush the system at the first opportunity after use and replace with fresh coolant.

Bleed the fuel system after any filter change — the 1HZ inline pump is self-bleeding but a hand-prime on the lift pump speeds up first-start after filter work. Mark filters with the date replaced.

Test the lift pump by cracking the outlet line fitting — fuel should pulse out under manual actuation of the primer lever. A seized primer lever usually means the cam lobe is on the high point — rotate the engine slightly.

A diesel smell from the engine bay, especially after shutdown, is often injector return line seeping. Replace all six O-rings as a set — they are cheap and a 30-minute field job with basic tools.

A pinhole in a fuel line can cause intermittent starting problems that are hard to diagnose. Inspect all fuel lines at every service — look for cracking at the ends near clamps and at bends. Never use standard garden hose as a fuel line substitute.

Always re-torque banjo bolts to spec — overtightening cracks the banjo, undertightening leaks. Copper washers can be annealed (heated red and quenched) for reuse in an emergency, but replace at the first opportunity.

Test resistance across each plug: 0.5–1.5 Ω is good. Open circuit = dead plug. Replace as a full set — mixing old and new creates uneven combustion. Glow plug replacement on the 1HZ is straightforward with a 10mm deep socket and patience.

Check the bus bar connections at every service — they corrode rapidly in humid conditions. A simple test: with the relay bypassed, connect a test light across the bus bar terminals — all plugs should glow within 10 seconds.

Monitor the battery warning light and voltmeter. A reading below 13.2V at cruise RPM suggests the alternator belt is slipping or the alternator is failing. A squealing belt under load = imminent failure.

A blown fuse is always a symptom — not the problem. Do not replace a fuse with a higher rating. Find the short or overload first. A fuse that blows repeatedly means there is a fault in that circuit.

Self-amalgamating tape is superior to electrical tape in heat and wet conditions — it forms a waterproof bond. Never tape over a bare wire without addressing the root cause. A crimping tool is essential — twisted wires vibrate apart within days off-road.

Test: with the engine off, bridge the two large terminals on the solenoid with a screwdriver — if the starter cranks, the solenoid is faulty. Use insulated gloves and ensure the gearbox is in neutral before doing this test.

Inspect the front axle area at every stop — grease on the inside of the rim or on the swivel housing is a warning sign. A grinding or clicking sound on full lock = damaged birfield. Replacement is a half-day job but is entirely field-doable.

Grease all UJ nipples at every service. A UJ that has run dry will feel gritty when rotated by hand — replace immediately. Carry a circlip removal tool — UJ replacement without one is extremely difficult in the field.

Check the gearbox and transfer case drain plugs at every stop in rough terrain — they can vibrate loose. Carry thread lock for the plug threads. If the oil is milky, water has entered the casing — a seal has failed.

Check diff oil for a white milky appearance after any deep water crossing — this indicates water ingress. Extend all differential breathers to snorkel height before any serious water crossing. Replace contaminated oil immediately.

Check clutch fluid level daily — it shares the reservoir with the brakes. A dropping level means a leak somewhere in the system. A spongy clutch pedal = air in the line. Bleed the clutch at each major service.

Inspect bushes visually at every service — look for cracking, splitting and movement. Collapsed bushes are often felt before they are seen: the steering feels woolly and the vehicle wanders on corrugations.

Re-torque U-bolts after the first 500km following any suspension work. Check by hand at every camp — grab and try to rotate the U-bolt. Any movement means it has loosened. Carry a torque wrench for this job.

Inspect all shock mounts at every camp. Apply thread lock to all mounting bolts at installation. Carry a rubber mallet — a shock eye that has walked off its pin can often be tapped back into position temporarily.

Check steering play at every fuel stop: turn the wheel and feel for free play before resistance. More than 25mm of play at the rim = investigate immediately. A seized or loose ball joint will show as movement when you grab and shake the wheel with the vehicle jacked up.

Check the power steering fluid level with the engine running and at operating temperature. Low fluid causes groan on full lock. A burning smell from the engine bay may be PS fluid on the exhaust — find the leak immediately.

A core plug failure is identified by a gush of coolant from the side or rear of the engine block. Emergency field repair using an expanding rubber plug is possible — carry one in the emergency kit.

RTV must be allowed to cure for at least 30 minutes before starting the engine. Use sparingly — excess RTV can break off internally and block oil passages. Anaerobic sealant requires metal contact and no oxygen to cure — ideal for mating surfaces.

Apply thread lock to all suspension hardware, engine ancillary bolts and gearbox drain plugs. Use anti-seize on anything that must be removed while hot or that has dissimilar metals. Never use anti-seize on wheel hub bolts.

Walk around the vehicle and look under the bonnet at every stop. Any wiring or hose that is touching a moving part, a hot surface, or a sharp edge needs to be secured immediately. Chafed wiring causes intermittent faults that are nearly impossible to diagnose.

Duct tape loses adhesion on wet, oily or dusty surfaces — clean and dry the surface before applying. Self-amalgamating tape does not rely on adhesive — wrap it under tension and it bonds to itself. Excellent for temporary hose repairs.

JB Weld cures in 4–6 hours at room temperature, longer in cold. Surface must be clean, dry and roughened. For a cracked sump, drain the oil, clean with brake cleaner, mix and apply generously. Allow to cure fully before refilling and running.

The most-used sockets on the 1HZ are 10mm, 12mm, 14mm and 17mm. The wheel nuts are 21mm. Carry two 10mm sockets — they disappear. A 3/8" torque wrench that covers 20–150Nm covers most drivetrain torque values.

The 17mm spanner is used constantly — for injector line nuts, hose clamps and steering hardware. Carry a ½" breaker bar for stubborn wheel bolts and drain plugs. A telescopic bar extension saves skinned knuckles.

A stripped JIS screw head can be removed with a left-hand drill bit or by cutting a slot with an angle grinder and using a flathead. Prevention: always use the correct JIS driver. The 1HZ glow plug connector screws are JIS.

Vice grips can crush and damage tubing and bolt heads if used carelessly. Use them for gripping, not for rotating fasteners. Circlip pliers are essential for propshaft UJ replacement and hub disassembly — the circlips cannot be removed safely without them.

A brass drift is safer than steel on alloy components — it will not damage the seating surface. Never use a steel hammer directly on alloy castings. A copper or brass hammer face is worth carrying if you anticipate drivetrain work.

Calibrate your torque wrench annually. Store horizontally with the setting backed off to minimum — leaving it set at high torque fatigues the spring. Mark critical torque values on a laminated card in the tool bag.

Know how to test: glow plug resistance (0.5–1.5Ω good), alternator output (13.8–14.4V at idle), and battery resting voltage (12.6V fully charged). Write these values on a card in the tool bag for reference.

To re-seat a bead without a compressor: wrap a ratchet strap around the tyre circumference, tighten until the bead pops out, then inflate with the ARB compressor. A 265/70R16 can be re-seated this way with patience.

The Hi-Lift is one of the most dangerous tools in the recovery kit — a loaded jack can kill. Always use on firm ground with the base plate. Chock the opposite wheel. Never work under a Hi-Lift-supported vehicle. Keep fingers clear of the mechanism.

Valve clearance that is too tight causes burnt valves. Too loose causes ticking and power loss. On the 1HZ, clearance adjustment requires a 12mm spanner on the rocker adjuster and a 12mm on the locknut — both done simultaneously.

Injection pump timing is set with the engine at TDC compression on cylinder 1. The 1HZ timing mark is on the crankshaft pulley. Correct timing for the turbocharged 1HZ is typically 3–5° BTDC — consult the pump workshop data for your specific setup.

Before any water crossing, confirm all breather tubes are routed above the water level you expect to cross. Identify the breather locations at home in daylight — gearbox, transfer case, front diff, rear diff. Each one is a potential water ingress point.

Position the bottle jack under a chassis rail or reinforced jacking point only — never under the body sill or floor pan. On soft ground, use the base plate. A bottle jack cannot be used sideways — the Hi-Lift is needed for angled lifts.

Run the compression test with the engine warm, throttle fully open (or injection pump disconnected), and glow plug circuit disconnected. Test each cylinder. A cylinder reading below 2,500 kPa requires investigation. A difference of more than 10% between cylinders also indicates a problem.

Clean all electrical connections before testing — a dirty connection can show false resistance readings. Never use steel wire brushes on aluminium — the steel particles embed in the alloy and cause galvanic corrosion. Use brass on aluminium only.