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5.6L 32v - VK56DE
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5.6L 32v - VK56DE
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Set of 16 trimetal connecting rod half-bearings for Nissan V8 VK45DE, VK45DD, VK50VE, VK56DE and VK56VD.
The VK is Nissan's family of V8 engines with 32 valves and double overhead camshafts: 4.5 litres for the VK45DE and VK45DD, 5.0 litres for the VK50VE, 5.6 litres for the VK56DE and VK56VD. It is found in the Patrol Y62, Armada, Titan, Pathfinder R51, Fuga and Cima, among others. ACL lists the same bearing set for these five 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.
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.
| ACL bearings Crankpin Ø 53.962 / 53.974 mm Housing bore Ø 57.000 / 57.013 mm Width 18.3 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 8B2990H-STD | ACL Race - Untreated | Standard | 1.508 |
| 8B2990HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.495 |
| 8B2990H-.025 | ACL Race - Untreated | +0.025 | 1.521 |
| 8B2990H-.25 | ACL Race - Untreated | +0.25 | 1.633 |
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 | 0.056 to 0.067 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.082 to 0.092 mm |
| +0.025 mm | Polished journal | 0.056 to 0.067 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.056 to 0.067 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 VK45DE, VK45DD, VK56DE and VK56VD V8 of the following Nissan models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| NISSAN | ARMADA MK I (TA60) 5.6 / 5.6 4x4 / 5.6 Flexfuel 4x4 / 5.6 Flexfuel | VK56DE | 309–321 hp | 2003–2015 |
| NISSAN | ARMADA MK II (Y62) 5.6 / 5.6 4x4 | VK56VD | 396 hp | 2016–2024 |
| NISSAN | CIMA (F50) 4.5 (GF50) / 4.5 4x4 (GNF50) | VK45DD | 280 hp | 2001–2010 |
| NISSAN | CIMA (F50) 4.5 (GF50) / 4.5 4x4 (GNF50) | VK45DE | 340 hp | 2001–2010 |
| NISSAN | FUGA I (_Y50) 450GT (GY50) | VK45DE | 333 hp | 2005–2009 |
| NISSAN | GLORIA XI (Y34) 4.5 | VK45DE | 340 hp | 2000–2004 |
| NISSAN | NV 2500 Standard Cargo Van 5.6 | VK56DE | 321 hp | since 2011 |
| NISSAN | NV 2500 Standard Cargo Van 5.6 | VK56VD | 375 hp | since 2017 |
| NISSAN | NV 3500 Standard Cargo Van 5.6 | VK56DE | 321 hp | 2011–2017 |
| NISSAN | NV 3500 Standard Cargo Van 5.6 | VK56VD | 375 hp | since 2017 |
| NISSAN | NV 3500 Standard Passenger Van 5.6 | VK56DE | 321 hp | since 2011 |
| NISSAN | NV 3500 Standard Passenger Van 5.6 | VK56VD | 375 hp | since 2017 |
| NISSAN | PATHFINDER III (R51) 5.6 / 5.6 4WD | VK56DE | 313–317 hp | since 2007 |
| NISSAN | PATROL VI (Y62) 5.6 | VK56DE | 317 hp | since 2010 |
| NISSAN | PATROL VI (Y62) 5.6 / 5.6 NISMO | VK56VD | 398–428 hp | since 2010 |
| NISSAN | PRESIDENT (PGF50) 4.5 | VK45DE | 280 hp | 2003–2010 |
| NISSAN | TITAN (A60) 5.6 / 5.6 4WD / 5.6 4x4 / 5.6 Flex-Fuel 4WD / 5.6 FLEX 4WD / 5.6 FLEX / 5.6 Flex-Fuel | VK56DE | 309–322 hp | since 2003 |
| NISSAN | TITAN (H61) 5.6 / 5.6 4x4 | VK56VD | 396 hp | since 2015 |
