M40 Road Closures & BMW M62B40 Engine

Understanding road closures and the intricacies of vehicle engines are crucial for any driver. Whether you're navigating daily commutes or planning longer journeys, being informed about potential disruptions and the mechanics of your car can save you time, stress, and money. This article delves into recent events concerning the M40 motorway and provides a comprehensive overview of the popular BMW M62B40 engine.

M40 Motorway Reopening and Incident Details

On Wednesday, June 8th, the M40 motorway experienced a significant closure on its southbound carriageway. The incident, which occurred between Junction 5 (Stokenchurch) and Junction 4 (High Wycombe) in Buckinghamshire, led to the road being shut down. The closure was first reported around 5:25 PM, causing considerable disruption for motorists.

Fortunately, by 7:20 PM, National Highways confirmed that two lanes had been reopened to traffic. A spokesperson stated, "Lanes 2 and 3 are now open on the M40 southbound between J5 (Stokenchurch) and J4 (High Wycombe). Lane 1 remains closed at this time for ongoing barrier repairs." This indicates that while the majority of the carriageway was accessible, essential repairs were still being carried out, contributing to residual delays.

The impact of the closure was felt by drivers, with approximately 3 miles of congestion reported on the approach to the affected area. These delays were estimated to add around 10 minutes to usual journey times. Traffic data company Inrix provided further details, noting that the road was closed for approximately two hours, reopening fully at 7:10 PM. They also mentioned that Lane 3 between Junctions 6 and 5 was temporarily closed due to a breakdown occurring within the existing queues, highlighting the cascading effect of initial incidents.

A diversion route was in operation to help manage traffic flow during the closure. For those seeking real-time traffic updates, joining local traffic and travel Facebook groups or signing up for daily email newsletters can be invaluable resources for staying informed about major routes across various counties.

The BMW M62B40 Engine: A Deep Dive

Shifting gears from road conditions to automotive engineering, let's explore the specifications, history, and characteristics of the BMW M62B40 engine, often a point of interest for enthusiasts and owners.

Engine Overview and Specifications

The BMW M62B44, and its technically updated variant the M62TUB44, is a V8 petrol engine that made its debut in 1996, succeeding the M60 series. Manufactured at BMW's Dingolfing plant, this 4.4-litre engine was a significant development in BMW's V8 lineup.

Technical Evolution: M62B44 to M62TUB44

The M62B44 was built upon the foundation of its predecessor, the M60B40. Key changes included an enlarged cylinder bore diameter, a new steel crankshaft with six counterweights, and revised pistons. While retaining the rods from the M60, the M62B44 featured nikasil cylinder coatings, later replaced with alusil from 1998 onwards to address potential issues with sulphur in fuel.

The cylinder heads were similar to the M60, but the camshaft specifications were updated for the M62B44. The valve train components were lightened, and a single-strand timing chain replaced the previous double-row design, offering a resource of approximately 150,000 to 200,000 km (90,000 to 120,000 miles). Other enhancements included new throttle bodies, an altered intake manifold, and ignition coils similar to those found in BMW M52 engines, along with a programmed thermostat and the Bosch DME M5.2 engine control unit.

The introduction of the M62TUB44 in 1998 marked a significant technical update. The "TU" designation signifies "Technical Update." The primary advancements included the addition of the VANOS (Variable Valve Timing) system on the intake camshaft, an electronic throttle body, an intake manifold with smaller port diameters, and an upgraded Bosch DME M7.2 engine control unit. These changes contributed to improved performance and efficiency.

Engine Variants and Successors

The M62 platform also spawned other variants, including the M62B35 (3.5-litre), M62B46 (4.6-litre), and the high-performance M-version, the S62B50. The M62B44's successor arrived in 2001 with the N62 engine series, with the N62B44 becoming its direct replacement.

Common Issues and Reliability

Despite its robust engineering, the M62B44 is known to have a few common issues that owners should be aware of:

1. Engine Rattling: This often stems from a stretched timing chain, which typically requires replacement between 150,000 and 200,000 km. Issues with the timing chain guide rails, tensioner rail, or tensioner itself can also cause rattling. The VANOS system also has a similar service life and can contribute to noise if worn.
2. Oil Leaks: Leaks from the valve cover gasket are relatively common. More significantly, leaks from the valley pan can occur, necessitating replacement of the pan and its gasket, along with gaskets for the intake manifold and water pump.
3. Rough Idling: Irregular idling is frequently attributed to air leaks within the intake manifold. Other potential causes include a faulty positive crankcase ventilation (PCV) valve, a dirty or malfunctioning mass airflow sensor, or a problematic throttle body position sensor.

Beyond these, oil consumption can increase significantly around the 250,000 km mark, often indicating the need for valve stem seal replacement. Engine mountings typically require attention every 200,000 km, and the alternator is also noted for occasional reliability concerns.

Crucially, the M62B44 performs best when using high-quality engine oil, preferably as recommended by BMW. Skimping on lubricants is not advisable for this engine. With proper and regular maintenance, the M62B44 is a durable and reliable powerplant, making it a strong choice for BMW vehicles.

Locating the Engine Number

The engine number for the M62B44 is typically found located between the cylinder heads, situated beneath the throttle body.

Tuning the M62B44 Engine

For those looking to extract more performance from their M62TU engine, several avenues exist:

• Intake Manifold Upgrade: Swapping to an intake manifold from an M62TU model with wider ports can yield a modest increase in horsepower.
• Performance Cams and Exhaust: For a more significant power gain, installing performance camshafts (e.g., 258/258 degrees duration), a cat-back exhaust system, and ECU remapping can result in approximately 330-340 HP. It's worth noting that basic "chip tuning" on a stock M62 is unlikely to provide substantial results.
• Supercharging: If power outputs exceeding 400 HP are desired, a supercharger kit is the recommended route. These kits are generally designed for straightforward installation on stock M62 pistons and can provide boost pressures of 6-7 psi (0.4-0.5 bar), sufficient to reach the 400+ HP mark. The stock internal components are capable of handling boost pressures up to 13-14 psi (0.9-1 bar), although for higher boost levels, forged pistons are advisable.

While constructing a twin-turbo setup for the M62 is possible, it is a complex and costly undertaking. In such cases, purchasing a factory-built performance vehicle like a BMW M5 might be a more practical option.

Frequently Asked Questions

Q1: Was the M40 fully reopened after the incident?
A1: The M40 southbound carriageway between J5 and J4 was reopened with two lanes by 7:20 PM on June 8th. Lane 1 remained closed for barrier repairs, and further temporary closures occurred due to breakdowns within queues.

Q2: What are the main issues with the BMW M62B44 engine?
A2: Common issues include timing chain rattle, oil leaks (particularly valve cover and valley pan gaskets), and rough idling, often caused by intake air leaks.

Q3: How reliable is the BMW M62B44 engine?
A3: When properly maintained with high-quality fluids, the M62B44 is considered a durable and reliable engine with a potentially long lifespan.

Q4: Can the M62B44 engine be tuned for more power?
A4: Yes, performance can be enhanced through intake manifold upgrades, performance camshafts, exhaust systems, ECU remapping, and notably, supercharging for significant power gains.

Q5: What is the difference between the M62B44 and M62TUB44?
A5: The M62TUB44 features the VANOS variable valve timing system, an electronic throttle body, and an updated ECU (Bosch DME M7.2), offering improvements over the original M62B44.