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ACL trimetal connecting rod bearings Nissan KA24E KA24DE
Set of 8 trimetal connecting rod half-bearings for Nissan KA24DE and KA24E.
- Brand and treatment: ACL Race
- Compatibility: 240SX, 200SX, Altima, Bluebird, Navara
- Engine codes: KA24DE, KA24E
- Available sizes: standard to +0.25 mm, increased-clearance version (HX)
The Nissan KA24E and KA24DE four-cylinder engines
The KA24E is Nissan's 2.4-litre inline four with a single overhead camshaft and 12 valves; the KA24DE is its double overhead camshaft version. They are found in the 240SX, Altima, Bluebird and Navara pick-ups, among others. ACL lists the same bearing set for both engines: 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.
From the factory, Nissan fits these engines with connecting rod bearings under part number 12111-40F00, and its workshop manual specifies a running clearance of 0.010 to 0.036 mm.
Trimetal connecting rod bearings
A trimetal bearing combines three layers with complementary roles: a steel back that provides structural strength, a copper-lead intermediate layer that takes the heavy loads and an anti-friction running layer that protects the crankpin. The complete set contains 8 half shells, i.e. 4 pairs.
An aluminium bi-metal bearing, intended for low to medium loads, tops out at around 8,000 psi; a performance trimetal bearing holds up to 12,000 psi, 50% more load capacity. It therefore gains strength and service life on turbocharged, supercharged or high-revving engines.
Technical specifications
| ACL bearings Crankpin Ø 49.961 / 49.974 mm Housing bore Ø 53.000 / 53.013 mm Width 20 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4B2746H-STD | ACL Race - Untreated | Standard | 1.505 |
| 4B2746HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.492 |
| 4B2746H-.025 | ACL Race - Untreated | +0.025 | 1.518 |
| 4B2746H-.25 | ACL Race - Untreated | +0.25 | 1.630 |
Running clearance
Running clearance is the space left between the bearing and the crankpin, permanently filled by the oil film.
With the engine running, the crankpin does not touch the bearing: it rides on this oil film, which takes the load. The clearance sets the film thickness. Too small, it restricts oil flow, raises the temperature and invites seizure; too large, it lets the oil escape, the film loses its load capacity and oil pressure falls. The right clearance combines sufficient lubrication with an oil film that keeps carrying the load.
| Size / grade | When to choose it | ACL Race Series |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.053 to 0.063 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.078 to 0.088 mm |
| +0.025 mm | Polished journal | 0.053 to 0.063 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.053 to 0.063 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.
Technical guide
The ACL connecting rod bearings shown here are trimetal bearings built for engine tuning and racing. They withstand far higher loads than a standard bearing and come in several sizes: the standard size, a +0.025 mm size for a crankpin 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. This range lets you refit a reground crankshaft without changing product line and match the clearance to the oil and use chosen.
The brand
 |
Founded in Australia in 1949, ACL Bearing Company designs high-performance engine bearings. Its Race Series brings together precision trimetal bearings, offered in a wide choice of sizes and fitted to built engines around the world. |
Vehicle compatibility
This connecting rod bearing set fits the KA24E and KA24DE four-cylinder engines of the following Nissan models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| NISSAN | 200SX (S13) 2.4 | KA24DE | 158 hp | 1990–1993 |
| NISSAN | 200SX (S13) 2.4 | KA24E | 141 hp | 1988–1990 |
| NISSAN | 240SX Hatchback 2.4 | KA24DE | 158 hp | 1990–1993 |
| NISSAN | 240SX Hatchback 2.4 | KA24E | 141 hp | 1988–1990 |
| NISSAN | 240SX Convertible 2.4 | KA24DE | 158 hp | 1991–1994 |
| NISSAN | 240SX 2.4 | KA24DE | 150–156 hp | 1988–2001 |
| NISSAN | 240SX 2.4 | KA24E | 141 hp | 1988–1990 |
| NISSAN | ALTIMA (L30) 2.4 | KA24DE | 152 hp | 1997–2001 |
| NISSAN | ALTRA Estate (N30) 2.4 | KA24DE | 155 hp | 1997–2001 |
| NISSAN | ATLAS II (F23, H41, H42) 2.4 | KA24E | 124 hp | 1995–2004 |
| NISSAN | BASSARA (JU30) 2.4 (JU30) | KA24DE | 150 hp | 1999–2002 |
| NISSAN | BLUEBIRD (U13, U14) 2.4 i | KA24DE | 152 hp | 1992–1997 |
| NISSAN | CARAVAN Bus (E25) 2.4 i (CGE25, CQGE25, DQGE25) / 2.4 | KA24DE | 140–141 hp | 2001–2012 |
| NISSAN | CARAVAN Van (E25) 2.4 i (CQGE25) | KA24DE | 140 hp | 2001–2012 |
| NISSAN | GLORIA XI (Y34) 2.4 | KA24DE | 152 hp | 1999–2004 |
| NISSAN | HOMY Van (E24) 2.4 | KA24E | 120 hp | 1992–1995 |
| NISSAN | LARGO MPV (W30) 2.4 i AWD (NW30, NCW30) / 2.4 i (CW30) | KA24DE | 116–146 hp | 1993–1999 |
| NISSAN | LEOPARD (Y33) 2.4 | KA24DE | 152 hp | 1995–2001 |
| NISSAN | LEOPARD Estate (Y33) 2.4 | KA24DE | 152 hp | 1995–2001 |
| NISSAN | NAVARA (D21) 2.4 4x4 / 2.4 i / 2.4 / 2.4 i 4x4 | KA24E | 124–143 hp | 1989–2008 |
| NISSAN | NAVARA (D22) 2.4 / 2.4 4x4 / 2.4 4WD | KA24DE | 143–150 hp | 1997–2013 |
| NISSAN | NAVARA (D22) 2.4 / 2.4 4x4 | KA24E | 107–126 hp | 1997–2003 |
| NISSAN | NAVARA Platform/Chassis (D21) 2.4 i / 2.4 i 4x4 | KA24E | 126 hp | 1992–1997 |
| NISSAN | NAVARA Platform/Chassis (D22) 2.4 i / 2.4 / 2.4 4WD | KA24DE | 126–150 hp | since 1997 |
| NISSAN | NAVARA Platform/Chassis (D22) 2.4 i / 2.4 i 4WD | KA24E | 126 hp | 1997–1999 |
| NISSAN | NAVARA NP300 (D40) 2.4 / 2.4 4WD | KA24DE | 146–150 hp | since 2004 |
| NISSAN | NP300 PICKUP (D22) 2.4 4x4 / 2.4 | KA24DE | 143 hp | since 2008 |
| NISSAN | PICK UP (D21) 2.4 i 12V / 2.4 i 12V 4WD / 2.4 / 2.4 4WD | KA24E | 124–140 hp | 1992–1998 |
| NISSAN | PICK UP (D22) 2.4 i 4WD / 2.4 / 2.4 4WD | KA24DE | 126–150 hp | since 1997 |
| NISSAN | PICK UP (D22) 2.4 i 4WD / 2.4 i / 2.4 | KA24E | 118–120 hp | 1998–2005 |
| NISSAN | PINTARA Hatchback (U12) 2.4 i | KA24E | 131 hp | 1990–1992 |
| NISSAN | PINTARA Saloon (U12) 2.4 i | KA24E | 131 hp | 1989–1992 |
| NISSAN | PRAIRIE PRO (M11) 2.4 i / 2.4 i 4x4 / 2.4 / 2.4 4x4 | KA24E | 133–140 hp | 1989–1994 |
| NISSAN | PRESAGE (U30) 2.4 (U30) / 2.4 4WD (NU30) | KA24DE | 150 hp | 1998–2002 |
| NISSAN | R'NESSA (N30) 2.4 4WD (PNN30) | KA24DE | 155 hp | 1997–2001 |
| NISSAN | SERENA (C23) 2.4 | KA24E | 126 hp | 1994–2000 |
| NISSAN | STANZA Saloon (U12) 2.4 | KA24E | 140 hp | 1989–1992 |
| NISSAN | TERRANO II (R20) 2.4 i 12V 4WD / 2.4 4WD | KA24E | 116–124 hp | 1993–2007 |
| NISSAN | URVAN Bus (E24) 2.4 | KA24DE | 140 hp | 2001–2010 |
| NISSAN | XTERRA (WD22_) 2.4 4WD / 2.4 | KA24DE | 143–146 hp | 1999–2004 |
Why replace the bearings
A failing connecting rod bearing does not fail alone: it scores the crankpin, sends debris through the oil circuit and calls at least for a crankshaft regrind, when it does not also take out the rod and the block. On a built engine, a bearing set costs only a fraction of a regrind, and even less of a full rebuild: it is the cheapest part of the rotating assembly and the one whose failure costs the most.
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Brand
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Reference4B2746H-STD
