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2.4L 12v - L24/L24E/L24S
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2.4L 12v - L24/L24E/L24S
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Set of 12 trimetal connecting rod half-bearings for Nissan L24, L26 and L28 inline-six engines.
The L24, L24E, L24S, L26, L28, L28E and L28ET are Nissan's 2.4, 2.6 and 2.8 litre inline-six petrol engines, fitted notably to the Datsun 240Z, 260Z, 280Z and 280ZX, as well as to the Skyline, Laurel, Cedric, Gloria, Leopard, Maxima, 810 and Patrol. ACL lists the same connecting rod bearing set, the 6B1171H, for the L Series engines of the Nissan Z-Car (1967 to 1986): 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 12 half shells, six pairs for a six-cylinder engine.
| ACL bearings Crankpin Ø 49.962 / 49.975 mm Housing bore Ø 53.005 / 53.013 mm Width 22.1 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 6B1171H-STD | ACL Race - Untreated | Standard | 1.504 |
| 6B1171HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.491 |
| 6B1171H-.025 | ACL Race - Untreated | +0.025 | 1.5165 |
| 6B1171H-.25 | ACL Race - Untreated | +0.25 | 1.629 |
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 | 0.053 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.
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 Nissan L24, L26 and L28 inline-six engines of the following vehicles:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Nissan | 240Z (S30) 2.4 | L24 | 150 hp | 1970–1974 |
| Nissan | 260Z (S30) 2.6 2+2 | L26 | 162–165 hp | 1974–1979 |
| Nissan | 280Z Coupé (S30) 2.8 2+2 | L28E | 151–171 hp | 1974–1978 |
| Nissan | 280ZX,ZXT (HGS130) 2.8 | L28E / L28ET | 140–200 hp | 1978–1984 |
| Nissan | DATSUN 240 Coupé (C210) KGT 2.4 | L24 | 131 hp | 1978–1981 |
| Nissan | DATSUN 280C Saloon (330) 2.8 (P330) | L28 | 135–147 hp | 1977–1979 |
| Nissan | DATSUN 280C Estate (330) 2.8 280C (WP330) | L28 | 135 hp | 1977–1979 |
| Nissan | 810 Hardtop 2.4 | L24 | 122 hp | 1978–1980 |
| Nissan | 810 Estate 2.4 | L24 | 122 hp | 1976–1981 |
| Nissan | BLUEBIRD (B610) (610) 2.4 | L24 | 122 hp | 1976–1980 |
| Nissan | MAXIMA I Saloon (G910) 2.4 | L24E | 122 hp | 1980–1984 |
| Nissan | MAXIMA I Estate (G910) 2.4 | L24E | 122 hp | 1980–1984 |
| Nissan | CEDRIC Saloon (230) GL / Deluxe (P230) | L24 | 131 hp | 1972 |
| Nissan | CEDRIC Hardtop (230) 240C (KP230) | L24 | 131 hp | 1971–1972 |
| Nissan | CEDRIC Estate (230) GL / Deluxe (VP230) | L24 | 131 hp | 1971–1972 |
| Nissan | CEDRIC Saloon (430) 2.8 (P430) | L28 / L28E | 140–147 hp | 1980–1984 |
| Nissan | GLORIA Coupé (330) 2.6 (KH300) | L26 | 140 hp | 1975–1978 |
| Nissan | GLORIA Saloon (330) 2.6 (H330) | L26 | 140 hp | 1975–1978 |
| Nissan | GLORIA Estate (330) 2.6 (WH330) | L26 | 140 hp | 1975–1978 |
| Nissan | LAUREL (HLC230) 2.4 / 2.8 | L24 / L28 | 113–120 hp | 1977–1983 |
| Nissan | LAUREL (JC31) 2.4 | L24 | 113–120 hp | 1981–1985 |
| Nissan | LAUREL (JC32) 2.4 / 2.8 | L24E / L24S / L28E | 128–140 hp | 1985–1987 |
| Nissan | LEOPARD Coupé (F30) 2.8 | L28E | 144 hp | 1981–1984 |
| Nissan | LEOPARD I (F30) 2.8 | L28E | 144 hp | 1981–1984 |
| Nissan | SKYLINE Coupé (C110) 2.4 (KHGC110) | L24 | 131 hp | 1972–1978 |
| Nissan | SKYLINE Saloon (C110) 2.4 (HGC110) | L24 | 131 hp | 1972–1978 |
| Nissan | SKYLINE Saloon (C210) 2.4 / 2.4 EFI | L24 / L24E | 128–131 hp | 1978–1981 |
| Nissan | SKYLINE (R30) 2.4 / 2.8 | L24E / L28E | 140 hp | 1981–1987 |
| Nissan | SKYLINE Estate (R30) 2.4 | L24E | 140 hp | 1981–1986 |
| Nissan | SKYLINE Hatchback (R30) 2.4 | L24E | 128 hp | 1982–1983 |
| Nissan | PATROL III/1 Estate (W160) 2.8 (W160) | L28 | 120 hp | 1980–1988 |
| Nissan | PATROL III/1 Hardtop (K160) 2.8 (K160) | L28 | 120–121 hp | 1980–1988 |
| Nissan | PATROL III/2 Hardtop (K260) 2.8 | L28 | 120 hp | 1986–1990 |
