Looking for Toyota 1HD-T cylinder head (OEM 11101-17042)? Our 12V SOHC casting fixes HDJ80 thermal cracking. Correct 69 Nm torque spec. Global shipping.
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Toyota 1HD-T cylinder head for 4.2L Turbo Diesel engines. OEM: 11101-17042. Compatible with the 12V 1HD-T Land Cruiser HDJ80 and Coaster bus series. In stock for immediate global export.
A frequent failure mode for high-mileage 4.2L turbo diesel units is thermal fatigue cracking between the intake and exhaust valve seats, often caused by sustained high Exhaust Gas Temperatures (EGT) during heavy towing. Because the 1HD-T is an interference engine, maintaining the integrity of the timing belt system is paramount; a belt snap will lead to catastrophic valve-to-piston contact. Our 11101-17042 heads are manufactured from high-density alloyed cast iron with reinforced coolant galleries to prevent the “white smoke” symptoms and head gasket blow-by common in aging 1HD-T engines. By providing the correct 18.6:1 compression ratio and precise 69 Nm (+90° +90°) bolt clamping force, our heads offer the metallurgical reliability needed for professional engine rebuilding.
| Parameter | Value |
|---|---|
| Engine Model | Toyota 1HD-T (4.2L Turbo Diesel) |
| Valve Configuration | SOHC, 12 Valves (2 per Cylinder) |
| Injection Type | Direct Injection (DI) |
| Compression Ratio | 18.6:1 |
| Turbocharger Compatibility | Toyota CT26 (0.48 bar / 8 PSI) |
| Timing System | Timing Belt (Interference Design) |
| Bore × Stroke | 94.0 mm × 100.0 mm |
| Power Output | 167 PS @ 3,600 rpm |
| Torque | 363 Nm @ 2,000 rpm |
| Intake Valve Diameter | 42.5 mm |
| Exhaust Valve Diameter | 36.0 mm |
| Valve Clearance (Cold) | Intake 0.15-0.25 mm / Exhaust 0.35-0.45 mm |
| Head Bolt Torque | 69 Nm + 90° + 90° (26 Bolts) |
| Material | High-Density Alloy Cast Iron |
| Cross-Reference | 11101-17020 |
| Engine Model | Fuel Type | Ref. OEM Number | Main Applications (Vehicles) |
|---|---|---|---|
| 1KD-FTV | Diesel | 11101-30050 11101-30030 | Hilux Vigo, Prado KDJ120/150, Fortuner, Hiace |
| 2KD-FTV | Diesel | 11101-30040 11101-30041 | Hilux Vigo, Hiace KDH200, Innova |
| 1KZ-TE | Diesel | 11101-69128 11101-69126 | Land Cruiser Prado KZJ90/95, Hilux Surf, Granvia |
| 1HZ | Diesel | 11101-17010 11101-17012 | Land Cruiser 70/80/105 Series, Coaster Bus |
| 2TR-FE | Petrol | 11101-75200 11101-0C040 | Prado TRJ120/150, Hilux, Fortuner, Tacoma |
| 3L | Diesel | 11101-54130 11101-54131 | Hilux LN106, Hiace LH113 (2.8L) |
| 5L | Diesel | 11101-54150 | Hilux LN167, Hiace LH172 (3.0L) |
| 22R / 22R-E | Petrol | 11101-35080 11101-35060 | Hilux, 4Runner, Celica (US Market) |
| 1HD-T / FT | Diesel | 11101-17042 11101-17020 | Land Cruiser HDJ80 / HDJ100 |
| 14B | Diesel | 11101-58040 | Dyna Truck, Coaster Bus (3.7L) |
| 15B / 15B-F | Diesel | 11101-58050 11101-58100 | Dyna Truck, Coaster Bus (4.1L) |
| 3B | Diesel | 11101-56034 (Old) 11101-58010 (New) | Land Cruiser BJ40/60/70, Dyna |
| 2L-II / 2L-T | Diesel | 11101-54111 11101-54121 | Hilux LN85, Surf, Prado LJ70 |
| 2L (Old) | Diesel | 11101-54050 11101-54062 | Hilux LN50, Hiace LH50 (Rocker Arm) |
| 2J | Diesel | 11101-20561 | Toyota Forklift (5FD Series) |
| 4Y | Petrol/LPG | 11101-73020 | Toyota Forklift (5FG/6FG), Hiace YH |
| 5K | Petrol | 11101-13062 | Toyota Forklift, Liteace, Townace |
| 2E | Petrol | 11101-19156 | Corolla, Starlet (1.3L) |
| 1TR-FE | Petrol | 11101-0C030 | Innova, Hiace (2.0L) |
| 1GD-FTV | Diesel | 11101-0E010 | Hilux Revo, Fortuner (2015+) |
| 2GD-FTV | Diesel | 11101-0E020 | Hilux Revo (2.4L) |
| 3RZ-FE | Petrol | 11101-79275 (8 Port) 11101-79087 (4 Port) | Prado RZJ90, Hilux, Tacoma |
| 1FZ-FE | Petrol | 11101-69155 | Land Cruiser FZJ80/105 (4.5L) |
| 1DZ-II | Diesel | 11101-78202 | Toyota Forklift (7FD/8FD) |
| 3C-TE | Diesel | 11101-64390 | Estima, Picnic, Camry |
| 1GR-FE | Petrol | 11101-39xxx | Prado GRJ120, FJ Cruiser (4.0 V6) |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Toyota | Land Cruiser HDJ80 / HDJ81 | 1990–1995 | 1HD-T 4.2L | 4WD Off-Road / Expedition |
| Toyota | Coaster Bus HDB20 | 1990–1993 | 1HD-T 4.2L | Passenger Transport |
| Toyota | Coaster Bus HDB30 / HDB50 | 1990–1995 | 1HD-T 4.2L | Commercial Utility |
No, they are completely incompatible. The 1HD-T (OEM 11101-17042/11101-17020) is a 12-valve SOHC design, whereas the 1HD-FT is a 24-valve multi-valve design. The valvetrain, camshaft, fuel injector orientation, and port configurations are entirely different. Attempting to mix these will result in severe mechanical failure. Always verify your valve count and injector placement before ordering for your Land Cruiser rebuild.
The 1HD-T utilizes a high-torque-to-yield bolt sequence. According to the Toyota Service Manual, the initial torque must be 69 Nm (51 ft-lb), followed by two sequential 90-degree turns. This specific stretch ensures the cast iron head maintains a hermetic seal against the multi-layer steel (MLS) gasket under peak cylinder pressures. Improper torque (such as using the lower 1HZ specs) is a leading cause of premature gasket failure in turbo diesel applications.
Yes, but the cracking patterns differ. While the indirect-injection 1HZ often cracks in the pre-combustion chambers, the direct-injection 1HD-T develops thermal fatigue cracks between the intake and exhaust valve seats due to heat soak from aftermarket turbo boost or heavy towing. Our reinforced 11101-17042 heads feature improved inter-valve metallurgy to resist this failure mode in high-EGT environments.
The Toyota 1HD-T is an interference engine. If the timing belt snaps, the camshaft stops but the crankshaft continues to move, forcing the pistons to strike the open valves. This typically results in bent valves and potential damage to the cylinder head guides and casting. Regular timing belt maintenance is critical to protecting your new 11101-17042 investment.
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