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ACL trimetal connecting rod bearings Toyota 1UZ-FE 2UZ-FE 3UZ-FE V8

New product

Set of 16 trimetal connecting rod half-bearings for Toyota 1UZ-FE, 2UZ-FE, 3UZ-FE.

  • Brand and treatment: ACL Race
  • Compatibility: Celsior, Crown, Soarer, Aristo, Land Cruiser 100, 200, Sequoia, Tundra, 4Runner
  • Engine codes: 1UZ-FE, 2UZ-FE, 3UZ-FE
  • Available sizes: standard to +0.50 mm, increased-clearance version (HX)

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  • The Toyota UZ V8 engines

    The 1UZ-FE (4.0 litre), 3UZ-FE (4.3 litre) and 2UZ-FE (4.7 litre) are the V8 engines of Toyota's UZ family, fitted to the Celsior, Crown, Soarer, Aristo, Land Cruiser 100 and 200, Sequoia, Tundra and 4Runner. ACL lists a single bearing set for these engines: same crankpin diameter, a single set covers the family.

    From the factory, this engine is fitted with standard production connecting rod bearings, sized for the loads of the original engine: as soon as power, engine speed or boost pressure increase, they reach their limits.

    Trimetal connecting rod bearings

    A trimetal bearing stacks three layers: a steel back, a copper-lead intermediate layer with high load capacity and an anti-friction running surface that protects the journal. The complete set contains 16 half shells, eight pairs for a V8 engine.

    The original bearing relies on an aluminium alloy over a steel back, intended for low to medium loads, whereas trimetal is designed for high, sustained loads: an aluminium bi-metal takes around 8,000 psi, a performance trimetal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.

    Technical specifications

    Fitment dimensions common to all references
    ACL bearings
    Crankpin Ø 51.981 / 51.999 mm
    Housing bore Ø 55.001 / 55.024 mm
    Width 19.5 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    8B8091H-STDACL Race - UntreatedStandard1.496
    8B8091HX-STDACL Race - UntreatedStd, increased clearance (HX)1.483
    8B8091H-.025ACL Race - Untreated+0.0251.509
    8B8091H-.25ACL Race - Untreated+0.251.621
    8B8091H-.50ACL Race - Untreated+0.501.746

    Running clearance

    The running clearance is the gap between the bearing and the journal where the oil film flows.

    In operation, the crankshaft journal does not rub against the bearing: it rides on this oil film, which carries the load. Clearance sets the thickness of this film: too tight, oil flows poorly, temperature rises and the risk of seizure increases; too loose, oil escapes, the film loses load-carrying capacity and oil pressure drops. The right clearance is the balance between adequate lubrication and a well-maintained oil film.

    Size / gradeWhen to choose itACL Race Series
    Standard (STD)Standard journal, not reground0.055 to 0.065 mm
    Increased clearance (HX)Wider clearance: high oil flow, high rpm0.080 to 0.090 mm
    +0.025 mmPolished journal0.055 to 0.065 mm
    +0.25 mmJournal reground to 0.25 mm0.055 to 0.065 mm
    +0.50 mmJournal reground to 0.50 mm0.055 to 0.065 mm

    Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the rod cap to spec, then compare the crushed strip against the gauge to read the clearance.

    Plastigauge

    Order the Plastigauge →

    Technical guide

    The ACL rod bearings shown here are trimetal bearings, designed for engine building and racing. Compared with an original bearing, they handle far higher loads: they cope with increased power, high rpm or the addition of a turbo or supercharger, where a standard bearing quickly reaches its limit.

    The brand

    ACL Bearing CompanyACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise trimetal bearings, available in many sizes and proven on built engines worldwide.

    Vehicle compatibility

    This connecting rod bearing set fits the 1UZ-FE, 2UZ-FE and 3UZ-FE V8 engines of the following Toyota models:

    BrandModel (chassis)Engine codePowerYears
    TOYOTA4 RUNNER IV (_N21_) 4.7 / 4.7 4WD2UZ-FE238–273 hp2002–2009
    TOYOTAARISTO (_S14_) 4.0 4WD1UZ-FE235 hp1992–1997
    TOYOTAARISTO (_S16_) 4.33UZ-FE305 hp1999–2004
    TOYOTACELSIOR (UCF1_) 4.01UZ-FE245 hp1988–1993
    TOYOTACELSIOR (UCF2_) 4.01UZ-FE264–280 hp1993–2000
    TOYOTACELSIOR (UCF3_) 4.3 VVTi3UZ-FE283 hp2000–2006
    TOYOTACROWN (CRS_, JZS_, GRS18_, UZS_) 4.3 / 4.3 Royal Saloon 4WD3UZ-FE280 hp2003–2008
    TOYOTACROWN (_S14_, _S13_) 4.0 / 4.0 4WD1UZ-FE260–265 hp1991–1995
    TOYOTACROWN (_S17_) 4.0 / 4.0 4WD1UZ-FE280 hp1999–2004
    TOYOTACROWN (_S20_) 4.3 V8 4WD3UZ-FE280 hp2009–2012
    TOYOTALAND CRUISER 100 (_J1_) 4.7 / 4.7 4WD2UZ-FE233–238 hp1998–2007
    TOYOTALAND CRUISER 200 (_J2_) 4.7 V82UZ-FE271–315 hp2007–
    TOYOTASEQUOIA (_K3_, _K4_) 4.7 4WD / 4.72UZ-FE238–280 hp2000–2007
    TOYOTASEQUOIA (_K6_) 4.7 4WD / 4.72UZ-FE280 hp2007–2014
    TOYOTASOARER Coupé (_Z3_) 4.01UZ-FE260–265 hp1991–1997
    TOYOTATUNDRA Pickup (_K3_, _K4_) 4.7 / 4.7 4WD2UZ-FE249–282 hp1999–2006
    TOYOTATUNDRA Pickup (_K5_, _K6_) 4.7 4WD / 4.72UZ-FE280 hp2006–2009