Machter Auto
26 Pcs Complete Engine Cylinder Head Bolt Set - Suitable For Landcruiser 1HZ 4.2L 70 80 Series
26 Pcs Complete Engine Cylinder Head Bolt Set - Suitable For Landcruiser 1HZ 4.2L 70 80 Series
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26-Piece Complete Cylinder Head Bolt Set – Toyota LandCruiser 1HZ 4.2L (70 & 80 Series)
Rebuild or replace your cylinder head with confidence on your Toyota LandCruiser 70 Series (HZJ70/HZJ73/HZJ75/HZJ78/HZJ79) or 80 Series (HDJ80/HZJ80) equipped with the legendary 4.2L 1HZ diesel engine. This complete 26-piece head bolt set includes all required bolts (M12 & M10) to securely clamp the cylinder head and prevent leaks, warping, or blow-by after a head gasket job, valve work, or a full engine rebuild. Essential for work trucks, troop carriers, or high-mileage Cruisers that have done years of towing, off-road abuse, or daily duties in Aussie heat and dust.
Key Features
- Full 26-piece set – includes all cylinder head bolts (typically 10 x M12 long, 8 x M12 short, 8 x M10) as per factory spec for 1HZ
- Direct replacement for OEM bolts on 1HZ 4.2L diesel engines (common ref 90910-021xx series or equivalent)
- High-tensile Grade 10.9 or 12.9 steel construction – hardened, tempered, and torque-to-yield capable
- Precision-rolled threads – superior strength and accurate torque application without stripping
- Phosphate or black oxide coating – corrosion-resistant for long-term reliability in humid or salty conditions
- Meets or exceeds Toyota OEM torque specs – designed for multi-stage torque + angle tightening procedure
Benefits
- Secure head clamping – prevents gasket blowouts, coolant/oil mixing, or compression loss on these long-life 1HZ motors
- Eliminates risk from reused/stretched old bolts – critical for head gasket success and engine longevity
- Restores factory torque retention – essential after machining head/block or fitting a new gasket
- Reduces risk of warping or cracking – proper clamping force protects expensive head and block components
- Great for rebuilds, head gasket jobs, or high-mileage refreshes – keeps your 70/80 Series running strong
- Essential for roadworthiness & reliability – weak or reused bolts can lead to catastrophic failure in NSW
Fitment Notes
- Suitable for Toyota LandCruiser with 4.2L 1HZ diesel engine: 70 Series (HZJ70/HZJ73/HZJ75/HZJ78/HZJ79), 80 Series (HDJ80/HZJ80)
- Professional installation recommended – always follow Toyota's multi-stage torque + angle procedure (typically 39 Nm + 90° + 90°)
- Always replace head bolts when removing the head – they are torque-to-yield and not reusable
- Pair with quality head gasket set, ARP-style studs (if upgrading), or full rebuild kit for best results
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Frequently Asked Questions
Are the head bolts on a Toyota 1HZ engine reusable or single-use?
The factory cylinder head bolts on the Toyota 1HZ are Torque-to-Yield (TTY) fasteners, meaning they are engineered to intentionally stretch when tightened to their final structural specification. Once a bolt has reached this yield state, it loses its elastic properties and structural memory. Reusing old, stretched bolts will lead to insufficient clamping pressure, which can cause premature head gasket failure, coolant leaks, or cylinder compression loss.
Which specific LandCruiser models and years does this 26-piece bolt set fit?
This complete heavy-duty bolt package is precision-manufactured specifically to suit Toyota's legendary 4.2-litre 6-cylinder naturally aspirated 1HZ diesel engine. It is a direct fit for 70 and 80 Series models, including popular touring platforms like the HZJ75, HZJ78, HZJ79, and HZJ80 built across the entire production lifecycle of this engine block layout.
Why is it essential to replace the entire 26-bolt set simultaneously?
To establish an even, reliable seal across the entire surface area of a long cast-iron 6-cylinder cylinder head, every fastener must apply uniform clamping tension. Mixing old, fatigue-stretched bolts with new ones causes uneven clamping forces across the block deck. This 26-piece kit replaces every single cylinder head fastener to prevent localized hot-spots and warping.
What are the signs that my engine has experienced a head bolt or gasket failure?
Common warning signs include a persistent loss of coolant without visible external leaks, heavy bubbling in the radiator or coolant overflow bottle, oil contamination turning into a milky sludge under the oil filler cap, or excessive white sweet-smelling smoke billowing out of the exhaust pipe. Severe cases can cause localized engine overheating under towing loads.
What critical cleaning step must be performed prior to installing the new bolts?
Proper execution during thread preparation is absolute. Before threading the new fasteners, you must thoroughly clean out the female bolt holes in the engine block to remove any residual oil, coolant, scale, or old thread sealant. If fluid is trapped at the bottom of a blind hole when a new bolt is torqued down, it creates a hydraulic lock. This can crack the engine block casting or yield false torque readings that compromise the cylinder head seal.
