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Tri-metal crankshaft main bearings ACL Hyundai Kia G4KC G4KD G4KE G4KF

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Set of 10 tri-metal crankshaft main bearing half shells for the five main bearings of the Hyundai and Kia G4KC, G4KD, G4KE and G4KF engines (Ø 51.94 mm).

  • Brand: ACL Race
  • Fitments: Hyundai and Kia 2.0 L, 2.0 L turbo and 2.4 L
  • Engine codes: G4KC, G4KD, G4KE, G4KF
  • Available sizes: standard to +0.25 mm, increased clearance version (HX)

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145,48 € tax incl.

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  • The Hyundai and Kia G4KC, G4KD, G4KE and G4KF four-cylinder engines

    The G4KC, G4KD, G4KE and G4KF are four-cylinder engines of the Hyundai and Kia Theta II family: 2.4 litre for the G4KC and G4KE, 2.0 litre for the G4KD and 2.0 litre turbo for the G4KF. They share the same crankshaft journal diameter: a single main bearing set covers the whole family.

    The crankshaft of these engines 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.

    Tri-metal main bearings

    A tri-metal 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 covers the five main bearings of the crankshaft. The upper and lower half shells are different: each goes in its own position.

    An aluminium bi-metal takes around 8,000 psi, a performance tri-metal 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
    Crankshaft journal Ø 51.942 / 51.960 mm
    Housing bore Ø 56.000 / 56.018 mm
    Width 18 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    5M1295H-STDACL Race - UntreatedStandard2.022
    5M1295HX-STDACL Race - UntreatedStd, increased clearance (HX)2.009
    5M1295H-.025ACL Race - Untreated+0.0252.0345
    5M1295H-.25ACL Race - Untreated+0.252.147

    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

    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.

    Plastigauge

    Order the Plastigauge →

    Technical guide

    The ACL main 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 main bearing set fits the following vehicles, by engine code:

    BrandModel (chassis)Engine codePowerYears
    HYUNDAIGENESIS Coupé 2.0G4KF209–277 hp2008–
    HYUNDAIGRANDEUR (HG) 2.4G4KE180–201 hp2011–2017
    HYUNDAIGRANDEUR (TG) 2.4G4KC162–164 hp2005–2011
    HYUNDAIGRANDEUR (TG) 2.4G4KC, G4KE180 hp2009
    HYUNDAIGRANDEUR (TG) CNGG4KC164 hp2007–2012
    HYUNDAIH-1 Cargo (TQ) 2.4G4KC171–175 hp2008–
    HYUNDAIH-1 Cargo (TQ) 2.4G4KE180 hp2015–
    HYUNDAIH-1 Travel (TQ) 2.4G4KC159–175 hp2008–
    HYUNDAISANTA FE IV (TM, TMA) 2.4G4KE173 hp2018–
    HYUNDAISANTA FÉ II (CM) 2.4G4KE174–177 hp2009–2012
    HYUNDAISANTA FÉ III (DM, DMA) 2.4G4KE171–175 hp2012–2018
    HYUNDAISONATA V (NF) 2.0G4KD162–165 hp2008–2010
    HYUNDAISONATA V (NF) 2.4G4KC162–174 hp2005–2010
    HYUNDAISONATA V (NF) 2.4G4KE177 hp2008–2010
    HYUNDAISONATA VI (YF) 2.0G4KD150–165 hp2009–2014
    HYUNDAISONATA VI (YF) 2.4G4KC177–203 hp2010–2015
    HYUNDAISONATA VI (YF) 2.4G4KE178 hp2010–2015
    HYUNDAISONATA VII (LF) 2.4G4KE171–178 hp2014–2019
    HYUNDAITUCSON (JM) 2.4G4KE177–178 hp2009–2015
    HYUNDAIix35 (LM, EL, ELH) 2.0G4KD150–168 hp2009–2015
    HYUNDAIix35 (LM, EL, ELH) 2.4G4KE170–177 hp2010–2015
    KIACADENZA I (VG) 2.4G4KE173 hp2013–2017
    KIACADENZA I (VG) 2.4G4KC, G4KE180 hp2010–2015
    KIACARENS III MPV (UN) 2.4G4KC163–177 hp2006–2013
    KIACERATO II (TD) 2.0G4KD156 hp2009–2013
    KIACERATO II (TD) 2.4G4KC175 hp2010–2013
    KIACERATO II Saloon (TD) 2.0G4KD150–160 hp2009–2014
    KIACERATO II Saloon (TD) 2.4G4KE175 hp2009–2013
    KIACERATO III Saloon (YD) 2.0G4KD150–160 hp2013–2018
    KIACERATO III Hatchback (YD) 2.0G4KD158 hp2013–
    KIACERATO KOUP II (TD) 2.0G4KD156–160 hp2009–2014
    KIACERATO KOUP II (TD) 2.4G4KE175 hp2010–2013
    KIAMAGENTIS II (MG) 2.0G4KD165 hp2009–2010
    KIAMAGENTIS II (MG) 2.4G4KC162–180 hp2005–2010
    KIAMAGENTIS II (MG) 2.4G4KE177 hp2008–2010
    KIAOPTIMA (FSGDS6B) 2.0G4KD144–170 hp2010–2015
    KIAOPTIMA (FSGDS6B) 2.4G4KC175–193 hp2010–2015
    KIAOPTIMA (FSGDS6B) 2.4G4KE179 hp2012–2015
    KIAOPTIMA (JF) 2.4G4KE171–180 hp2015–
    KIASHUMA Coupé 2.0G4KD156–158 hp2010–2014
    KIASORENTO II (XM) 2.4G4KE171–177 hp2009–2015
    KIASORENTO II Camionnette/SUV (XM) CVVTG4KE174 hp2009–2015
    KIASORENTO III (UM) 2.4G4KE172–175 hp2015–2020
    KIASPORTAGE II (JE_, KM_) 2.0G4KD166 hp2009–2010
    KIASPORTAGE III (SL) 2.0G4KD150–178 hp2010–2016
    KIASPORTAGE III (SL) 2.4G4KE177–178 hp2010–2015