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2.0L 8v - 1RZ
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2.0L 8v - 1RZ
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Set of tri-metal crankshaft main bearing half shells for the five main bearings of Toyota 1RZ, 2RZ, 3RZ-FE and 2TZ-FE engines.
The 1RZ, 1RZ-E, 2RZ, 2RZ-E, 2RZ-FE, 3RZ-FE, 2TZ-FE and 2TZ-FZE are Toyota four-cylinder petrol engines of 2.0 to 2.7 litres, fitted notably to the Hilux, Hiace, 4Runner, Tacoma, Land Cruiser Prado and Previa. The crankshaft journal and housing dimensions are those of the ACL bearing set shown here, for five main bearings.
The crankshaft of this engine runs on five main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The ACL Race Series tri-metal set shown here replaces them on built engines.
In a trimetal bearing, a steel back carries a copper-lead intermediate layer with high load capacity, itself covered by an anti-friction running layer that spares the main journal. The set is supplied complete: 0 half shells, i.e. The complete set covers the five main bearings of the crankshaft. The upper and lower half shells are different: each goes in its own position.
Trimetal targets high, sustained loads, whereas aluminium bi-metal is limited to low to medium loads: about 8,000 psi for the latter, up to 12,000 psi for a performance trimetal, 50% more. The benefit shows in strength and durability on turbo, supercharged and high-revving engines.
| ACL bearings Crankshaft journal Ø 59.987 / 60.000 mm Housing bore Ø 64.000 / 64.024 mm Width 23.15 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M8378H-STD | ACL Race - Untreated | Standard | 1.99 |
| 5M8378HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.977 |
| 5M8378H-.025 | ACL Race - Untreated | +0.025 | |
| 5M8378H-.25 | ACL Race - Untreated | +0.25 |
Running clearance is the gap between the bearing and the main journal, filled by the oil film.
While the engine turns, the main journal floats on this oil film, which carries the load without direct contact with the bearing. Film thickness depends on clearance: too tight, oil passes poorly, temperature rises and the risk of seizure grows; too wide, oil escapes, the film carries less and oil pressure decreases. A correct clearance ensures both sufficient lubrication and a well-maintained film.
| Size / grade | When to choose it | ACL Race Series |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.061 to 0.073 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.086 to 0.098 mm |
| +0.025 mm | Polished journal | 0.061 to 0.073 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.061 to 0.073 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the main cap to spec, then compare the crushed strip against the gauge to read the clearance.
These ACL trimetal main bearings are aimed at built engines and racing: where a standard bearing quickly reaches its limit, they accept more power, more rpm and more boost. The range includes the standard size, a +0.025 mm size for a main journal that has only been polished, a +0.25 mm regrind size and the HX version with increased clearance for high-revving engines or engines needing a high oil flow. It allows the same part number to be kept after the crankshaft is reground and the clearance to be tailored to the oil used and the engine's duty.
 | An Australian specialist in high-performance engine bearings since 1949, ACL Bearing Company produces the Race Series: precisely made trimetal bearings, available in numerous sizes and recognised on built engines across the world. |
This main bearing set fits the 1RZ, 1RZ-E, 2RZ, 2RZ-E, 2RZ-FE, 2TZ-FE, 2TZ-FZE and 3RZ-FE engines of the following Toyota models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Aro | 240-244 | 2RZ-FE | 140 hp | 1999–2006 |
| Baw | Luba | 2RZ-FE | 143 hp | 2004–2017 |
| C.A.M | LEO Pick-up | 2RZ | 131 hp | 2009– |
| C.A.M | Rhino Pick-up | 2RZ | 131 hp | 2007– |
| Daihatsu | Delta Platform/Chassis (U3_, U4_) | 3RZ-FE | 144 hp | 2002–2012 |
| Foton | View Bus (BJ5_) | 2RZ-E | 120 hp | 2002–2016 |
| Jinbei | Haise III | 2RZ | 120 hp | 2001–2007 |
| Jinbei | Haise IV | 2RZ | 120 hp | 2003–2012 |
| Toyota | 4 Runner III (_N18_) | 2RZ-E, 3RZ-FE | 116–152 hp | 1995–2002 |
| Toyota | Camroad Platform/Chassis (_Y2_) | 1RZ-E | 105 hp | 2001–2003 |
| Toyota | Coaster Bus (_B4_, _B5_) | 3RZ-FE | 133–152 hp | 1993–2003 |
| Toyota | Dyna 200 Platform/Chassis | 3RZ-FE | 125 hp | 1995–2001 |
| Toyota | Dyna 300 Platform/Chassis | 2RZ-FE | 140 hp | 1998–2001 |
| Toyota | Dyna 300 Van | 2RZ-FE | 140 hp | 1998–2001 |
| Toyota | Dyna Platform/Chassis | 1RZ-E, 3RZ-FE | 105–144 hp | 2000–2007 |
| Toyota | Estima Emina / Lucida (_R1_, _R2_) | 2TZ-FE, 2TZ-FZE | 135–160 hp | 1990–1999 |
| Toyota | Granvia (_H2_, _H1_) | 3RZ-FE | 145 hp | 1995–1998 |
| Toyota | Hiace IV Bus (_H1_) | 1RZ, 1RZ-E, 2RZ, 2RZ-E, 3RZ-FE | 98–143 hp | 1989–2004 |
| Toyota | Hiace IV Bus (__H1_, __H2_) | 2RZ-E, 3RZ-FE | 115–144 hp | 1995–2006 |
| Toyota | Hiace IV Van (_H1_) | 1RZ, 1RZ-E, 2RZ, 2RZ-E | 98–120 hp | 1989–2004 |
| Toyota | Hiace IV Van (__H1_, __H2_) | 2RZ-E, 3RZ-FE | 116–144 hp | 1995–2005 |
| Toyota | Hilux III SUV (_N1_, _N2_) | 3RZ-FE | 145–152 hp | 1995–2005 |
| Toyota | Hilux VI Platform/Chassis (_N1_) | 1RZ-E, 3RZ-FE | 110–145 hp | 1997–2005 |
| Toyota | Hilux VI Pick-up (_N1_) | 1RZ, 1RZ-E, 2RZ-FE, 3RZ-FE | 92–150 hp | 1997–2005 |
| Toyota | Land Cruiser 90 (_J9_) | 3RZ-FE | 150 hp | 1995–2002 |
| Toyota | Land Cruiser Prado (_J12_) | 3RZ-FE | 152 hp | 2002–2004 |
| Toyota | Previa I (_R1_, _R2_) | 2TZ-FE, 2TZ-FZE | 132–160 hp | 1990–2000 |
| Toyota | Qualis (_F5_) | 1RZ-E | 94 hp | 1999–2004 |
| Toyota | Regius ACE Van (_H4_) | 1RZ-E, 3RZ-FE | 109–147 hp | 1997–2002 |
| Toyota | Stallion Van (_F6_) | 1RZ-E | 97 hp | 2003–2005 |
| Toyota | T100 Pick-up (_CK_) | 3RZ-FE | 152 hp | 1993–1998 |
| Toyota | TUV MPV (_F7_, _F8_) | 1RZ-E, 2RZ-E | 97–116 hp | 2000–2005 |
| Toyota | Tacoma Pick-up (_N1_) | 2RZ-FE, 3RZ-FE | 144–152 hp | 1995–2004 |
| Toyota | Tarago Bus | 2RZ-E, 3RZ-FE | 116–144 hp | 1989–2004 |
| Toyota | Tarago Van | 2RZ-E, 3RZ-FE | 116–144 hp | 1989–2004 |
| Toyota | Town ACE Bus | 2RZ-E | 120 hp | 1992–1995 |
| Toyota | Toyoace Platform/Chassis (_Y2_, _U_) | 3RZ-FE | 141–144 hp | 2000–2012 |
Replacing the bearings during a build or rebuild guards against the most expensive failure: a worn-out main bearing scores the main journal, contaminates the oil circuit with debris and forces at least a crankshaft regrind, or even block repairs. Against such costs a new set weighs little: it is the cheapest part of the crankshaft assembly, but the one whose failure costs the most.
