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2.4L 16v - 4G64
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2.4L 16v - 4G64
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Set of 8 trimetal connecting rod half-bearings for Mitsubishi petrol four-cylinder engines.
The 4G30 to 4G37 (1.2 to 1.8 litre), 4G61 (1.6 litre, naturally aspirated or turbo), 4G62 (1.8 litre) and 4G64 (2.4 litre), as well as the G31B, G32B, G33B, G37B, G62B, G63B and G64B, are inline petrol four-cylinder engines of Mitsubishi, fitted notably to the Colt, Lancer, Mirage, Galant, Sapporo, Sigma, Cordia, Tredia, Space Wagon, Eclipse, Pajero, L200 and L300. 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.
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 8 half shells, four pairs for a four-cylinder 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.
| ACL bearings Crankpin Ø 44.991 / 45.000 mm Housing bore Ø 48.000 / 48.020 mm Width 23.5 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4B1146H-STD | ACL Race - Untreated | Standard | 1.489 |
| 4B1146HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.476 |
| 4B1146H-.025 | ACL Race - Untreated | +0.025 | 1.5015 |
| 4B1146H-.25 | ACL Race - Untreated | +0.25 | 1.614 |
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 / grade | When to choose it | ACL Race Series |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.049 to 0.058 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.074 to 0.083 mm |
| +0.025 mm | Polished journal | 0.049 to 0.058 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.049 to 0.058 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.
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.
 | ACL 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. |
This connecting rod bearing set fits the 4G30 to 4G37, 4G61, 4G62, 4G64 and G31B to G64B petrol four-cylinder engines of the following Mitsubishi models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| MITSUBISHI | COLT II (C1_A) 1.4 (C12A) / 1.6 (C13A) | 4G33, 4G32 (SOHC 8V) | 73–80 hp | 1982–1986 |
| MITSUBISHI | COLT III (C5_A) 1.6 GTi 16V (C53A) / 1.4 / 1.6 | 4G61 (DOHC 16V), 4G33, 4G32 (SOHC 8V) | 76–124 hp | 1986–1990 |
| MITSUBISHI | CORDIA (A21_A, AB, AC) 1.6 GSL (A212A) / 1.8 GSL (A215A) / 1.8 (A215A) / 1.8 (A213A) | 4G32 (SOHC 8V), 4G37, 4G62 (SOHC 8V) | 75–95 hp | 1982–1989 |
| MITSUBISHI | ECLIPSE Convertible 1.8 | 4G37 | 92 hp | 1989–1994 |
| MITSUBISHI | ECLIPSE I (D2_A) 1.8 (D21A) | 4G37 | 92 hp | 1989–1994 |
| MITSUBISHI | EXPO Station Wagon 2.4 | 4G64 (SOHC 8V) | 118 hp | 1991–1992 |
| MITSUBISHI | GALANT III (A12_) 1.6 (A121) | 4G32 (SOHC 8V) | 75 hp | 1977–1980 |
| MITSUBISHI | GALANT III Station Wagon (A12_V) 1.6 GL (A121V) | 4G32 (SOHC 8V) | 75 hp | 1979–1980 |
| MITSUBISHI | GALANT IV (A16_) 1.6 GLX (A161A) | 4G32 (SOHC 8V) | 75 hp | 1980–1984 |
| MITSUBISHI | GALANT IV Station Wagon (A16_V) 1.6 GLX (A161V) | 4G32 (SOHC 8V) | 75 hp | 1980–1984 |
| MITSUBISHI | GALANT V (E1_A) 1.6 GLX (E11A) / 2.0 GLS (E15A) / 2.4 GLS (E16A) / 2.4 / 1.8 (E12A) | 4G32 (SOHC 8V), G63B, G64B, 4G64 (SOHC 8V), 4G37 | 75–125 hp | 1984–1990 |
| MITSUBISHI | GALANT VI (E3_A) 1.8 (E32A) / 1.8 | 4G37 | 86–90 hp | 1988–1992 |
| MITSUBISHI | GALANT VI Saloon (E3_A) 1.8 (E32A) / 1.6 (E31A) / 1.8 (E37A) | 4G37, 4G32 (SOHC 8V) | 75–94 hp | 1987–1993 |
| MITSUBISHI | L 300 / DELICA II Bus (L03_P/G, L0_2P) 1.6 (L032P, L062P) / 1.8 4WD (L035G) / 2.0 DL / 1.8 (L035P) / 1.6 (L032P, L032W) | 4G32 (SOHC 8V), 4G62 (SOHC 8V), G63B | 65–90 hp | 1980–1987 |
| MITSUBISHI | L 300 / DELICA II Platform/Chassis (L03_P) 1.6 (L032P, L062P, L036P) / 2.0 / 1.8 | 4G32 (SOHC 8V), G63B, 4G62 (SOHC 8V) | 70–90 hp | 1982–1994 |
| MITSUBISHI | L 300 / DELICA II Van (L03_P) 1.6 (L032P, L062P) / 2.0 DL (L037P) / 1.6 (L062P, L032P) / 1.8 (L035P) / 1.8 4WD (L035P) | 4G32 (SOHC 8V), G63B, 4G62 (SOHC 8V) | 65–90 hp | 1980–1986 |
| MITSUBISHI | L 300 III Bus (P0_W, P1_W, P2_W, P3_W) 1.6 (P02W, P12W) / 2.0 (P03W, P13W) / 2.4 4WD (P24W) / 2.4 (P04W, P14W) | 4G32 (SOHC 8V), G63B, G64B, 4G64 (SOHC 8V) | 69–112 hp | 1986–2004 |
| MITSUBISHI | L 300 III Van (P0_V, P1_V, P2_V) 1.6 (P12V, P02V) / 2.0 (P03V, P13V) / 1.4 (P01V, P11V) / 2.0 (P23W, P23V) / 2.4 (P24V, P24W) / 2.4 4WD (P24V, P24W) / 2.4 (P04V, P14V) | 4G32 (SOHC 8V), G63B, 4G33, G64B, 4G64 (SOHC 8V) | 68–112 hp | 1986–1997 |
| MITSUBISHI | L200 1.6 | 4G32 (SOHC 8V) | 82 hp | 1980–1986 |
| MITSUBISHI | L200 (K3_T, K2_T, K1_T, K0_T) 1.6 (K11T) / 2.4 4WD / 2.4 | 4G32 (SOHC 8V), 4G64 (SOHC 8V) | 82–124 hp | 1986–1996 |
| MITSUBISHI | L400 Van (PD_W, PC_W, PB_V, PA_W, PA_V) 1.6 | 4G32 (SOHC 8V) | 69 hp | 1996–2002 |
| MITSUBISHI | LANCER CELESTE Coupe (A7_) 1.6 ST (A73A) | 4G32 (SOHC 8V) | 73 hp | 1977–1981 |
| MITSUBISHI | LANCER F (A15_) 1.4 (A156) / 1.6 (A157) | 4G33, 4G32 (SOHC 8V) | 73–80 hp | 1984–1986 |
| MITSUBISHI | LANCER I (A7_) 1.2 (A75A) / 1.4 (A72A) / 1.6 (A73A) | 4G36, 4G33, 4G32 (SOHC 8V) | 55–82 hp | 1975–1979 |
| MITSUBISHI | LANCER I Station Wagon (A7_V) 1.4 (A72V) | 4G33 | 68 hp | 1978–1979 |
| MITSUBISHI | LANCER II (A17_) 1.6 (A174) | 4G32 (SOHC 8V) | 82–84 hp | 1979–1983 |
| MITSUBISHI | LANCER III (C1_A, C6_A) 1.4 / 1.6 | 4G33, 4G32 (SOHC 8V) | 76–80 hp | 1986–1990 |
| MITSUBISHI | LANCER III Station Wagon (C1_V, C3_V) 1.8 4WD (C37V) | G37B, 4G37 | 83–94 hp | 1987–1992 |
| MITSUBISHI | LANCER IV (C6_A, C7_A) 1.6 GTi (C63A) / 1.6 GLX (C63A) / 1.6 GSR Turbo (C63A) / 1.6 GSR Turbo 4WD (C73A) | 4G61 (DOHC 16V), 4G61-T (DOHC 16V) | 124–146 hp | 1988–1992 |
| MITSUBISHI | LANCER IV Hatchback (C6_A, C7_A) 1.8 4WD (C77A) / 1.6 GTi (C63A) / 1.8 GTi (C77A) / 1.6 i (C63A) | 4G37, 4G61 (DOHC 16V) | 95–124 hp | 1988–1993 |
| MITSUBISHI | LANCER V (CB_A, CD_A, CE_A) 1.8 GTi | 4G37 | 95 hp | 1992–1993 |
| MITSUBISHI | MIRAGE I Saloon (A15_) 1.6 (A157) | G32B, 4G32 (SOHC 8V) | 88 hp | 1979–1983 |
| MITSUBISHI | MIRAGE II Saloon (C10) 1.5 (C18A) | G31B | 71 hp | 1986–1988 |
| MITSUBISHI | MIRAGE II Hatchback (C10) 1.5 (C18V) | G31B | 71 hp | 1986–1988 |
| MITSUBISHI | MIRAGE III Hatchback (C5_ - C8_) 1.6 Gti (C53A) / 1.6 Turbo (C53A) / 1.6 Turbo / 1.6 Turbo (C83A) | 4G61 (DOHC 16V), 4G61-T (DOHC 16V) | 125–145 hp | 1988–1991 |
| MITSUBISHI | MIRAGE III Station Wagon 1.8 GS 4WD (C37W) / 1.5 (C18W) | G37B, G31B | 71–90 hp | 1986–1988 |
| MITSUBISHI | PAJERO I (L04_G, L14_G) 2.0 4WD (L041G, L046G, L146G) | G63B | 110 hp | 1983–1991 |
| MITSUBISHI | PAJERO II (V3_W, V2_W, V4_W, V5_W) 2.4 (V21W) | 4G64 (SOHC 8V) | 112 hp | 1991–1999 |
| MITSUBISHI | PAJERO II Canvas Top (V2_C, V4_C) 2.4 (V21C) | 4G64 (SOHC 8V) | 112 hp | 1991–2000 |
| MITSUBISHI | SAPPORO I (A12_) 1.6 SL, GL (A121) | 4G32 (SOHC 8V) | 75 hp | 1978–1980 |
| MITSUBISHI | SAPPORO II (A16_A) 1.6 GLX (A161A) | 4G32 (SOHC 8V) | 75 hp | 1980–1984 |
| MITSUBISHI | SAPPORO III (E16A) 2.4 (E16A) | 4G64 (SOHC 8V) | 124 hp | 1987–1990 |
| MITSUBISHI | SIGMA (GE) 1.6 | 4G32 (SOHC 8V) | 76 hp | 1977–1980 |
| MITSUBISHI | SIGMA (GJ, GK, GN) 1.6 | 4G32 (SOHC 8V) | 82 hp | 1982–1985 |
| MITSUBISHI | SIGMA Estate (GJ, GK, GN) 1.6 | 4G32 (SOHC 8V) | 82 hp | 1982–1985 |
| MITSUBISHI | SPACE WAGON (D0_V/W) 1.8 GLX (D05V, D05W) / 2.0 GLX (D04W) / 2.0 GLX 4WD (D08W) / 1.8 4WD (D05V, D05W) / 1.8 GLX (D05W) / 1.8 (D05W, D05V) | 4G37, G63B, G37B | 84–95 hp | 1984–1991 |
| MITSUBISHI | SPACE WAGON (N3_W, N4_W) 2.4 | 4G64 (SOHC 8V) | 117 hp | 1991–1992 |
| MITSUBISHI | SPACE WAGON VAN (D0_V/W) 1.8 (D05V) | 4G37 | 86–90 hp | 1983–1988 |
| MITSUBISHI | TREDIA (A21_) 1.6 GLS (A212) / 1.8 GLS (A215) / 1.8 Turbo (A215A) / 1.8 Turbo / 2.0 / 1.8 GLS 4WD (A215G) / 1.8 | 4G32 (SOHC 8V), 4G37, G62B, G63B, 4G62 (SOHC 8V) | 75–136 hp | 1982–1988 |
