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5.6L 32v - VK56DE
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5.6L 32v - VK56DE
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Set of 10 tri-metal crankshaft main bearing half shells for the five main bearings of the Nissan and Infiniti VK45, VK50 and VK56 V8 engines (Ø 63.95 mm).
The VK45DD, VK45DE, VK50VE, VK56DE and VK56VD are 32-valve, twin-cam-per-bank V8 engines of the Nissan and Infiniti VK family: 4.5 litre for the VK45DD and VK45DE, 5.0 litre for the VK50VE and 5.6 litre for the VK56DE and VK56VD. 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.
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.
| ACL bearings Crankshaft journal Ø 63.952 / 63.962 mm Housing bore Ø 68.944 / 68.968 mm Width 20.1 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M2995H-STD | ACL Race - Untreated | Standard | 2.495 |
| 5M2995HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 2.482 |
| 5M2995H-.025 | ACL Race - Untreated | +0.025 | 2.5075 |
| 5M2995H-.25 | ACL Race - Untreated | +0.25 | 2.62 |
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 | 0.064 to 0.077 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.090 to 0.102 mm |
| +0.025 mm | Polished journal | 0.064 to 0.077 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.064 to 0.077 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.
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.
 | 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 main bearing set fits the following vehicles, by engine code:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Infiniti | FX | VK45DE | 316–325 hp | 2002–2008 |
| Infiniti | FX | VK45DE, VK50VE | 328–420 hp | 2008– |
| Infiniti | M (Y51) | VK56VD | 408–426 hp | 2010– |
| Infiniti | M45 | VK45DE | 329–340 hp | 2005– |
| Infiniti | M45 | VK45DE | 340 hp | 2002–2004 |
| Infiniti | Q45 III (F50) | VK45DE | 340–344 hp | 2001–2006 |
| Infiniti | Q70 (Y51) | VK56VD | 402–426 hp | 2013– |
| Infiniti | QX56 | VK56DE | 324 hp | 2003–2010 |
| Infiniti | QX56 | VK56VD | 400–441 hp | 2010– |
| Infiniti | QX70 | VK50VE | 390–431 hp | 2013– |
| Infiniti | QX80 | VK56VD | 398–441 hp | 2013– |
| Mitsuoka | Galue Saloon | VK45DE | 340 hp | 2003–2005 |
| Nissan | Armada MK I (TA60) | VK56DE | 309–360 hp | 2003–2015 |
| Nissan | Armada MK II (Y62) | VK56VD | 396–405 hp | 2016–2024 |
| Nissan | Cima (F50) | VK45DD, VK45DE | 280–340 hp | 2001–2010 |
| Nissan | Fuga I (_Y50) | VK45DE | 333 hp | 2005–2009 |
| Nissan | Gloria XI (Y34) | VK45DE | 340 hp | 2000–2004 |
| Nissan | NV 2500 Standard Cargo Van | VK56DE, VK56VD | 321–375 hp | 2011– |
| Nissan | NV 3500 Standard Cargo Van | VK56DE, VK56VD | 321–375 hp | 2011– |
| Nissan | NV 3500 Standard Passenger Van | VK56DE, VK56VD | 321–375 hp | 2011– |
| Nissan | Pathfinder III (R51) | VK56DE | 313–317 hp | 2007– |
| Nissan | Patrol VI (Y62) | VK56DE, VK56VD | 317–428 hp | 2010– |
| Nissan | President (PGF50) | VK45DE | 280 hp | 2003–2010 |
| Nissan | Titan (A60) | VK56DE | 309–322 hp | 2003– |
| Nissan | Titan (H61) | VK56VD | 396–405 hp | 2015– |
