Guide to the 2011-2013 INFINITI M37 Engine VVT Sprocket
Tackle rough idling and poor performance in your M37 by understanding VVT sprocket failure and replacement options.
- VVT sprocket failure is often linked to low oil pressure, which can be caused by failing oil gallery gaskets on 2011-2012 models.
- This is a very complex and labor-intensive repair; it is not recommended for DIY unless you are an expert mechanic.
- Hitachi is the likely OEM supplier, making their aftermarket parts a top-tier choice for quality and fit.
- Due to the high labor cost, it is strongly advised to replace timing chains, guides, and the water pump at the same time.
Is Your M37's VVT Sprocket Failing?
A failing VVT sprocket can cause noticeable engine problems. Because the system relies on clean oil and proper pressure, many symptoms can be linked to oil-related issues. If you experience a sudden drop in oil pressure, it is critical to shut the engine off immediately to prevent severe damage.
A Critical Related Issue: Gallery Gaskets
For 2011 and some 2012 M37 models, a major known issue is the failure of the rear timing cover's paper oil gallery gaskets. These gaskets can fail, causing a severe drop in oil pressure. This low pressure starves the VVT system of oil, leading to VVT-related error codes like P0011 and P0021, and can quickly cause catastrophic engine damage. If you have these codes, it is essential to check oil pressure immediately. 🎬 Watch this guide on how to fix P0011 and P0021 codes. The permanent fix is to replace the paper gaskets with updated metal versions, a labor-intensive job that requires removing the timing cover. While doing this repair, it is highly recommended to replace the VVT sprockets, timing chains, and water pump at the same time.
Choosing the Right Aftermarket VVT Sprocket
When replacing a VVT sprocket, you have several aftermarket options. The quality can vary, so it's important to choose a reputable brand.
- Hitachi: Hitachi is widely considered to be the Original Equipment Manufacturer (OEM) for many of Nissan and INFINITI's engine components. Choosing a Hitachi VVT sprocket is the closest you can get to buying the original part from the dealer, often at a lower price. They are built to exact OE specifications for a direct fit and reliable performance.
- Standard Ignition (SMP): Standard Motor Products is a well-respected aftermarket brand that offers a range of quality levels. Their VVT sprockets are designed to match OE performance and undergo significant testing. 🎬 Take a closer look at Standard's VVT sprocket manufacturing and testing. They are a solid alternative to OEM.
- Gates: Gates is a major name in the automotive aftermarket, particularly known for timing belts and components. Their VVT sprockets are another reliable option to consider for this repair.
- Dorman: Dorman provides a wide variety of aftermarket parts. While they offer a budget-friendly option, for a critical and labor-intensive job like this, sticking with a brand known for OE-quality, like Hitachi, is often recommended by mechanics.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $450 - $750 per sprocket |
| New Aftermarket | $305 - $671 per sprocket |
| Shop Labor | $1200 - $2800 |
Cost estimates are for a single sprocket and do not include taxes, fees, or related parts like gaskets, seals, or timing chains, which should be replaced at the same time. Labor costs are high because replacing the sprockets requires extensive disassembly of the front of the engine. 🎬 Learn why VVT sprocket replacement is such a labor-intensive repair.
Frequently Asked Questions
What are the main symptoms of a bad VVT sprocket?
The most common symptoms are a check engine light with codes P0011, P0014, P0021, or P0024, a rough idle, poor engine performance and acceleration, decreased fuel economy, and a rattling noise from the engine, especially on startup.
Can I replace just one VVT sprocket?
While you can replace only the failed sprocket, the repair is very labor-intensive. Most mechanics recommend replacing both intake sprockets, the timing chains, guides, tensioners, and water pump at the same time to avoid having to do the same job again in the near future.
Is Hitachi the same as OEM for my INFINITI?
Hitachi is the original equipment manufacturer for many electronic and engine parts on Nissan and INFINITI vehicles. A Hitachi-branded part is often identical to the part you would buy from an INFINITI dealer, just in a different box.
Are there any recalls for the M37 VVT system?
There are no specific recalls for the VVT sprockets on the 2011-2013 INFINITI M37. However, a voluntary service campaign (P6305) was issued for the timing chain on the M56 model, which shares a similar engine architecture, but this did not apply to the M37's VQ37VHR engine.
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Technical Specifications
OEM Part Numbers: 13025-JK21A 13025-JK20A
The 2011-2013 INFINITI M37 uses the VQ37VHR 3.7L V6 engine. This engine has four camshafts and four VVT sprockets (also called cam phasers): one for the intake and one for the exhaust on each cylinder bank. The most common failures occur on the intake sprockets.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- INFINITI M37: