Nissan VK56DE Engine Problems
The Nissan VK56DE is a 5.6L V8 engine that made its debut in 2004. It actually shares a similar design to that of the smaller V6 VQ35DE. Nissan 5.6L engines are best known for their use in the Nissan Titan, Pathfinder, Armada, and Infiniti QX56 models. With 305 to 320 horsepower the VK56DE is a capable performer. It also offers a fair balance of reliability and longevity. However – as with all other engines – the 5.6 V8 isn’t perfect. In this article, we discuss a few common problems with the Nissan VK56DE engine along with overall reliability.
What Cars Use the VK56 5.6 V8?
5.6 liter Nissan VK56DE engines are in the following Nissan and Infiniti models:
- 2004-2015 Nissan Armada
- 2004-2015 Nissan Titan
- 2004-2010 Infiniti QX56
- 2010-2016 Nissan Patrol
- 2008-2012 Nissan Pathfinder
- 2012-2016 Nissan NV2500/3500
It also has a few uses in motorsports applications; notably, the Australian Supercars Championship. These engines use the same base design as the VQ56DE. However, they’re highly modified and displacement is 5.0 liters.
Nissan VK56DE Engine Specs
Specs for the VK56DE engine are:
|Bore x Stroke||98mm x 92mm|
|Compression||9.8 : 1|
Due to its use in larger vehicles the VK56DE uses relatively high displacement of 5.6L. Its built for torque which it delivers peak around 3,600 RPM’s. The DOHC design with variable valve timing on the intake help the engine make 300+ horsepower.
Its performance certainly isn’t mind-blowing by modern standards. However, for its era the VK56DE delivers good all-around performance.
3 Common VK56DE Engine Problems
A few common problems with the Nissan VK56DE 5.6 V8 engine include:
- Timing chain
- Exhaust manifold
- Oil leaks
We’ll discuss these issues in-depth through the rest of this article. However, it’s a good time to add some quick notes before diving in. We’re calling these the most common VK56DE 5.6 V8 engine problems for good reason. It doesn’t mean they’re common in the true sense of the definition. Rather, when issues arise these are a few of the most common areas.
The Nissan 5.6L V8 is a pretty reliable engine overall. That said, this article is in no ways an exhaustive list of anything that can or will go wrong with the VK56 engine. We’ll circle back to VK56DE and Nissan Titan reliability at the end of this article. For now, let’s break down the above common problems.
1) Nissan 5.6L V8 Timing Chain Issues
Timing chain problems on the VK56DE may not be as common as some may lead you to believe. However, it’s still a known issue and we’re discussing it in this article for good reason. The main failure seems to be the timing chain actually stretching. This can then cause damage to the tensioners, which furthers the problem.
Fortunately, Nissan addressed the VK56 timing chain problems with an updated chain. As such, this issue primarily affects models prior to 2012. It’s an expensive issue due to the labor process to replace the 5.6L timing chain.
If the chain fails it will likely be north of 100,000 miles, but it can and has occurred sooner. Be on the lookout for symptoms of timing chains stretching around that mileage. Again, this likely isn’t a problem that affects a huge number of VK56DE engines. It’s worth the mention simply due to the cost of repairs, which we’ll discuss shortly.
VK56 V8 Timing Chain Symptoms
Look for the following symptoms that may indicate an issue with the Nissan VK56DE timing chain:
- Squealing / rattling sound
- Check engine light
- Power loss
- Poor engine operation
When the Nissan 5.6 V8 timing chain begins stretching it will naturally develop some slack. This causes a squeaking or rattling-like sound from the engine. It’s usually the primary warning sign that the timing chain is on its way out. If the timing actually jumps a few teeth then you’ll likely notice a plethora of symptoms. These can vary depending on how much the timing jumps.
The engine might not even run at all if timing is too far off. If it jumps a little it will likely continue running. However, you’ll notice issues like a check engine light, power loss, and poor overall engine operation.
Nissan 5.6 Timing Chain Replacement
Replacement costs for the VK56 5.6 V8 timing chain are not very fun to hear. The parts for the job come in around $400-1000 depending on where they’re sourced. Labor generally takes about 15-20 hours, so that’s going to add quite a bit of cost to the VK56DE timing chain repair. Most shops charge around $75-125 an hour for labor, so expect about $1500-2000+ in labor alone.
Experienced DIY’ers can save a lot of money on this repair. However, unless you’re very comfortable and confident then we would leave this job to the pros.
2) VK56DE Engine Exhaust Manifold Problems
Exhaust manifold cracking is definitely among the most common problems on the Nissan VK56DE engines. This is especially a common issue on Nissan Titan models. However, it’s likely equally as common across all cars that use the 5.6L V8. To note – exhaust manifolds are also known as headers and exhaust headers.
Poor design is the main factor in manifolds cracking on the Nissan 5.6 V8 engine. Metals expand with heat, and the exhaust manifold is subject to extreme heat. The constant heating and cooling wears down on the metal. Over time, metal fatigue causes the manifold to crack and begin leaking exhaust gases.
It’s a fairly minor issue in the grand scheme as its highly unlikely to have any negative impacts on VK56DE performance, reliability, or longevity. However, ticking sounds can be embarrassing. Additionally, exhaust leaks can cause the 5.6L engine to fail emissions or visual inspections if detected. In other words, it’s not an urgent problem but most will likely want to repair the manifolds.
Nissan VK56DE Exhaust Manifold Symptoms
Some possible symptoms of cracked exhaust manifolds on the Nissan VK56 engine are:
- Ticking sound
- Raw exhaust smell
- Check engine light
Ticking sounds from the engine is the most common symptom of a problem with the exhaust manifold. It’s usually mostly noticeable on a cold engine. As the engine warms up the metal expands and the cracks generally close up some. This can help muffle the ticking sound from the Nissan 5.6L V8.
If the leak is severe enough you might notice raw exhaust smells (similar to the smells from a catless exhaust). It’s also possible for manifold cracks to trigger a check engine light or fault codes. However, this is unlikely unless there’s a pretty significant crack.
5.6L V8 Manifold Replacement
Nissan attempted to fix the issue with manifolds cracking, but it was a pretty weak attempt. They simply added a little extra metal bracing. It might help buy some extra mileage before issues, but it wasn’t an effective solution. Point is – none of the OEM options are a completely fool-proof fix.
As such, some choose to go with aftermarket VK56 headers. There are plenty of choices that help reduce the risk of the manifolds cracking again. However, aftermarket exhaust does come with legality and emissions inspection concerns.
3) Nissan VK56 5.6 V8 Oil Leaks
Alright. We’ll try to wrap things up quickly in this section. There aren’t any major design flaws that cause oil leaks on the 5.6L V8 engine from Nissan. However, early model VK56 engines are getting fairly old. Many cars and engines run into occasional oil leaks as they surpass 10 years and 100,000 miles. The main oil leak on the Nissan VK56DE 5.6L is the valve cover gaskets (VCG).
Valve covers seal the head of the engine, and the gaskets seal the gap between the head and valve cover. The VCG’s are rubber-like parts that typically become brittle with age. Eventually they develop small cracks and begin leaking oil. As a V8 engine, the VK56DE uses 2 valve cover gaskets. They’re cheap parts, so it’s a pretty minor issue.
VK56DE Valve Cover Gasket Oil Leak Symptoms
Symptoms of an oil leak from the 5.6 V8 valve cover gasket include:
- Visible leak
- Burning oil smells
- Light smoke from engine bay
A visible leak is a pretty obvious symptom. However, it’s not always a symptom when it comes to VK56DE valve cover gaskets leaking. Since they lie towards the top of the engine small drops of oil don’t always make it to the ground.
Instead, burning oil smells are common if the oil is leaking onto other hot components like the exhaust or manifold. This may also produce some light smoke from the engine bay.
Nissan 5.6 V8 Oil Leak Fix
Again, the valve cover gaskets themselves are cheap. If you plan on replacing both it’s about $40-50 for the set of gaskets. Some owners with high mileage also opt to replace the plastic valve covers, but that can add quite a bit in parts cost.
Labor is usually a couple hours for each gasket, so add in a bit more if you’re going to a repair shop. It’s a pretty simple DIY, but it does require moving quite a few hoses & connectors out of the way. Below is a quick video showing the VCG job on a Nissan VK56DE engine.
Nissan VK56DE Reliability
How reliable is the Nissan VK56DE 5.6 V8 engine? We believe the 5.6L engine earns above average remarks for reliability. There are a few design flaws with early timing chains that can lead to costly repair bills. Otherwise, there aren’t many serious flaws with the Nissan VK56DE engine.
Many owners actually say the Nissan 5.6 V8 is the most reliable part of the Nissan Titan. As such, there are other considerations before purchasing a Titan or other Nissan powered by the VK56DE. Some Titan models have problems with stuff like differentials and brakes. Anyways, we’re mainly focused on the engine itself so we’ll get back on track.
Reliability often comes down to luck of the draw and maintenance. Maintain the VK56DE well; use quality oils, change fluids on time, and fix problems if and when they occur. Do this and the VK56 5.6 V8 will likely offer a rewarding and reliable life. It’s not uncommon for these engines to make it beyond 250,000 miles – not bad for longevity.
VK56DE Common Engine Problems Summary
Nissan 5.6 V8 engines made their first appearance in the 2004 Titan and Armada. They offer a respectable 305+ horsepower which is plenty of power for most needs. Additionally, the VK56DE engine offers a good balance of reliability and longevity.
A few common VK56DE problems include the timing chain, exhaust manifolds, and valve cover gaskets. The timing chain does require a lot of labor to replace, so be on the lookout for that. Otherwise, exhaust manifolds and valve cover gaskets are known to crack, especially north of 100,000 miles. Both are relatively minor issues in the grand scheme.
Most importantly, ensure you maintain the Nissan 5.6L V8 well. With proper maintenance these engines can live long, reliable lives. Some make it beyond 200,000 with few issues along the way.
What’s your experience with the VK56DE engine? Drop a comment and let us know!