BMW B47 Engine Problems

The BMW 4 Series convertible is a testament to the German automaker’s commitment to blending luxury with performance. Potential buyers, especially those transitioning from brands like Mercedes, often find themselves at a crossroads when choosing between the B47 and N47 engines. While both engines promise similar torque and power figures, they come with their unique set of challenges. This article breaks down the common problems associated with the BMW B47 engine and their respective solutions.

1. B47 vs. N47: A Quick Comparison

The primary distinction between the B47 and the N47 lies in their maintenance requirements:

• B47: This engine is more suited for those who stick to basic maintenance activities such as oil changes and brake services.
• N47: While more affordable, this engine demands frequent preventative maintenance. Think gasket changes, timing chains, and more. Despite these needs, a well-maintained N47 can be quite reliable.

There’s chatter that the N47 might be the most problematic BMW engine. However, it’s crucial to note that most of these complaints come from scenarios where vehicles underwent intense usage without proper maintenance. It’s a universal fact: any engine requires diligent care to remain dependable.

2. Power and Performance

Both engines, as mentioned, deliver almost identical power and torque. So while big power might not be on the cards, you can look forward to incredible fuel efficiency and generous torque. If given a choice, some might lean towards the N57 or the B57, particularly because of the appeal of BMW’s 6-cylinder diesel configuration.

3. Fuel Economy Concerns

The fuel economy varies slightly between models:

• 430d/435d: These models are expected to average about 6L/100km or around 55 MPG. With careful driving, these numbers can improve.
• 420d: This model is even more economical, averaging close to 5L/100km or about 60 MPG.

The 30d/35d models are often recommended as they offer an optimal mix of performance, reliability, and economy.

4. Notable Improvements in the N47 (Post-April 2011)

The N47 engines produced after April 2011 saw several significant changes:

• Chain Replacement: To address the issues with the chain’s lifespan, BMW introduced a more reliable, longer, and stronger version.
• Water Pump Upgrade: An improved version was introduced to minimize the risk of leakage.
• Engine Mount Upgrade: New mounts were integrated to boost engine stability and limit vibration.
• Oil Pump Replacement: The new oil pump promises better performance while reducing the risk of engine damage.

Conclusion:

Transitioning from another luxury brand or even within BMW models can be a journey filled with expectations and apprehensions. While the BMW B47 engine promises an array of benefits, it’s essential to be well-informed about potential challenges and their solutions. Armed with this knowledge, you can ensure that your BMW remains the ultimate driving machine for years to come.