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Toyota Hilux 2005-2013 factory workshop and repair manual download

Tools & supplies
- Metric socket set (10–19mm), deep & swivel sockets, extensions
- Torque wrench (capable to required spec)
- Breaker bar (1/2" drive)
- Penetrating oil (PB Blaster, WD-40 Specialist)
- Impact wrench (optional, use carefully)
- Oxygen sensor socket (22mm/7/8" or specific)
- Ratchet, combination wrenches
- Vise grips / locking pliers
- Stud extractor / E-Z Out set and left-hand drill bits
- Wire brush, gasket scraper, clean rags
- Thread chaser or tap (same thread as manifold studs)
- Anti-seize compound (for new studs/bolts & O2 sensor threads)
- Replacement manifold gasket, new studs/bolts/nuts (recommended), downpipe gasket, heat-shield hardware
- Jack, jack stands or vehicle ramps, wheel chocks
- Safety glasses, gloves, long sleeves, respirator if grinding/welding
- Flashlight/inspection light, magnetic tray for hardware

Safety precautions (read and follow)
- Work on a cold engine. Hot exhaust parts cause severe burns.
- Park on level ground, engage park/gear and chock wheels. Use jack stands — never rely on a jack alone.
- Disconnect negative battery terminal before working near sensors/electrical.
- Wear eye protection and gloves. Use respirator if cutting/welding or working with chemicals.
- If heating bolts with a torch to free them, remove/cover all flammable fluids and wiring; have a fire extinguisher.
- If welding a cracked manifold, remove/manufacture around O2 sensor/catalyst and protect sensors; welding can damage cast iron if not done properly.
- Follow local disposal rules for old gaskets and contaminated rags.

Common replacement parts to have on hand
- Exhaust manifold gasket (engine-specific)
- New manifold-to-head bolts/studs and nuts (Toyota often recommends replacing)
- Downpipe gasket / exhaust flange gasket
- Heatshield clips/bolts if corroded
- Oxygen sensor (if seized or damaged)
- Replacement manifold if cracked beyond repair

Overview of the repair
- You will remove the downpipe/collector connection and heat shield(s), remove the manifold fasteners, extract the manifold, clean/inspect mating surfaces and threads, install new gasket(s) and fasteners, and torque to factory sequence/specs. If studs break, extract them and repair threads or install new studs/Helicoil inserts.

Step-by-step procedure
1. Preparation
- Confirm exact Hilux model & engine (get factory service manual for torque specs and bolt sequences).
- Gather parts/tools. Park, chock wheels, disconnect negative battery.
- Let engine cool fully.

2. Gain access
- Raise front of vehicle and secure on jack stands or use ramps.
- Remove components blocking access: airbox, intake plumbing, heatshield(s) over manifold, kinked wiring harness clips, EGR pipe if fitted (mark positions).
- Remove or unbolt oxygen sensor from manifold if it blocks removal — use O2 socket; apply penetrating oil to threads first.

3. Soak fasteners
- Liberally spray penetrating oil on manifold-to-head bolts/studs, downpipe flange nuts, and other corroded fasteners. Let soak 15–30 minutes; repeat if needed.

4. Support the downpipe
- Support the downpipe/collector with a jack or stand so weight isn’t carried by studs when you break nuts.

5. Remove downpipe flange nuts/bolts
- Loosen and remove flange nuts/bolts that connect manifold to downpipe. Use breaker bar or impact gun. Save hardware if reused, but replacement recommended if corroded.

6. Remove heat shield(s)
- Remove all heat shield bolts and keep track of hardware and positioning.

7. Remove manifold fasteners
- Remove manifold nuts/bolts in a cross/zig-zag pattern from the outside toward the center or as instructed by manual. Use breaker bar to break initial torque; remove by hand or with ratchet.
- If using an impact wrench, be cautious—impact can snap studs. Apply steady force with a breaker bar if studs are suspect.

8. Remove manifold
- Once all fasteners and connections are removed, pull the manifold away from head. It may be stuck from old gasket—tap gently with rubber mallet if required.
- Inspect manifold for cracks (especially around bolt bosses and mounting flange) and check mating surface for pitting.

9. Deal with broken studs/bolts (if present)
- If studs are broken flush or below surface, use a left-hand drill bit to try to back the stud out by drilling into it. Use progressive drill sizes, keep drill centered.
- If stud won’t back out, use a stud extractor or E-Z Out. Work slowly to avoid damaging head threads.
- If threads in head are damaged, chase them with a thread chaser or tap. If threads are badly stripped, install a Helicoil insert or repair sleeve to factory spec or replace cylinder head fastener hardware per manual.
- Clean out metal shavings thoroughly from the head before proceeding.

10. Clean mating surfaces
- Use gasket scraper, wire brush and rag to remove old gasket material from head and manifold. Do not gouge surfaces. Clean with solvent and lint-free rag.
- Ensure bolt holes are clean and free of corrosion—run a tap or thread chaser through each.

11. Inspect parts & decide repair vs replacement
- If manifold is cracked or warped, replacement is usually best. Small cracks on cast iron can sometimes be welded by a qualified welder (preheat, nickel/ferrous welding); beware distortion and hidden cracks.
- Replace O2 sensor if its threads or heater are damaged.

12. Install new gasket & manifold
- Place new manifold gasket onto head, align dowels if present.
- Position manifold and hand-start new studs/bolts or reuse chased threads. Apply anti-seize to bolt threads per manufacturer guidance (do not over-apply; some factory bolts have torque-to-yield—check manual and use new bolts where required).
- Tighten nuts/bolts finger-tight following a center-out sequence. There are usually 6–8 fasteners; follow factory torque sequence (center and alternate outward).

13. Torque to spec
- Using torque wrench, tighten in stages: snug all fasteners to a low torque, then to final specified torque in sequence. If manual calls for angle tightening, follow that procedure.
- Also torque downpipe flange nuts/bolts to spec.

14. Reinstall heatshield, O2 sensor, intake parts
- Reinstall heat shields and all removed components. Apply anti-seize to O2 sensor threads (small amount) and thread sensor in carefully; torque to spec.
- Reattach any EGR or vacuum lines, sensors, wiring harnesses.

15. Lower vehicle & final checks
- Reconnect negative battery terminal.
- Start engine and check for leaks around manifold flange and downpipe. Listen for ticking/sniffing leaks; use a rag or your hand at a safe distance to feel for air flow — only when confident surfaces are cool.
- After a short run, re-torque bolts if manufacturer recommends a re-check procedure.

How each critical tool is used
- Breaker bar: apply steady controlled leverage to break rusted nuts loose. Don’t jerk; use body weight.
- Penetrating oil: spray on threads and let soak; repeat. It reduces seizure risk.
- Left-hand drill bits / E-Z Out: drill center hole, then turn extractor counterclockwise to back out broken stud. Be gentle—extractors can snap and ruin threads.
- Thread chaser/tap: cleans existing threads — run carefully, keep perpendicular, and back out chips frequently.
- Torque wrench: final tightening to specified torque. Tighten in stages and in the sequence recommended to avoid warping.
- Oxygen sensor socket: has cutout to clear sensor wiring; use for safe removal without damaging sensor leads.

Common pitfalls & how to avoid them
- Breaking studs: apply penetrating oil, heat, and use breaker bar slowly. Replace corroded studs rather than reusing.
- Damaging head threads with E-Z outs or aggressive drilling: center drill accurately, use lubricant, and stop frequently. If threads damage, be prepared to install Helicoils or new hardware.
- Skipping torque sequence or spec: always use factory values and sequence to prevent leaks or warpage.
- Reusing old gasket or bolts: gasket should always be replaced. Replace bolts/studs if visibly corroded or if manufacturer advises single-use torque-to-yield fasteners.
- Forgetting to support downpipe: manifold studs can snap or threads can be loaded if downpipe weight is borne by studs.
- Hot work without protection: welding or heating near sensors, hoses, and flammable materials can cause damage or fire.

When welding vs replacing
- Cast iron manifolds: cracked cast iron can sometimes be welded by a specialist after preheating, but welding introduces risk of warpage and failure if not done properly. Replacement often more reliable.
- Mild steel manifolds: easier to repair but check flange flatness.

Final checks
- After reassembly, check for exhaust leaks at idle and under load. A small leak will sound like a ticking and can be located with a smoke source or soapy water test (with engine off and cool for soap test).
- Re-check torque after initial heat cycles if manual recommends.
- Monitor check-engine light; O2 sensor or leak can trigger codes — scan and address accordingly.

Note: Specific torque values and tightening sequence vary by Hilux model year and engine. Obtain the factory service manual or a reputable repair database for exact specs before final torque and for any model-specific steps.
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