Over time, the timing chain stretches and wears out. The chain tensioner linked to the timing chain also wears out, which can cause complete failure of the timing chain and may even cause your vehicle to require repairs.
The N47 engine family is prone to excessive premature timing chain failure that has become a serious problem for many BMW owners. The most seriously affected units require extensive repairs between 1st March 2009 and 5th January 2013.
In our last video, we had time discussing N47 this prone problem and you may refer to this video.
EGR Sensor Malfunction:
Is your BMW equipped with an engine gas recirculation (EGR) valve?
The EGR systems help to ensure the car maintains fuel efficiency and emits fewer emissions. But this system malfunctions when the sensor accumulates a lot of soot, and it makes more and more exhaust air recirculate into the intake. As a result, your vehicle will have emission and performance problems.
To clean an EGR valve, it will have to be removed, but it's not an easy task for all vehicles. However, cleaning the EGR valve is more of a temporary solution, because an old EGR valve gasket may be damaged too. That's we recommend replacing the EGR valve gasket instead of just cleaning it.
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DPF Not Working:
BMW introduced DPF – Diesel particulate filters around 2004 that filter out soot or diesel particulate matter from the exhaust gases.
But when the car only gets used for short journeys, the DPF will not get hot enough to remove the soot and exhaust gases results in soot build up on your turbo, DPF sensor, EGR sensor and even on your engines glow plugs.
Why does it fail?
- Irregular maintenance
- Frequent short journeys cause the engine doesn’t get hot
- The wrong type of engine oil – check the owner’s manual
- EGR sensor malfunction causing excess soot
- A problem with the fuel system
Don’t ignore an Engine or DPF warning light. The BMW recommends DPF Cleaning is to be carried out every 10 years or 120,000 miles. However premature blocking of the DPF is usually caused by incorrect running or fault of the engine which we suggested is diagnosed first before DPF cleaning.
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Power Steering Pump problem:
The power steering pump is also not much reliable on the BMW N47 engine. The failure of this unit will sudden loss of power assisted steering, causing the steering to become incredibly heavy at low speeds. It can be identified from oil spillage around the cap of the steering oil reservoir.
How to diagnose power steering problems?
- Check your power steering fluid level.
If it's not full, low levels may be a sign of a leak.
- Inspect the lines and hoses around the pump.
Checking for wear and tear, cracks, softness, bulges, and other signs of weakness.
- Listen for noises from the pump.
Any noises can be an indicator of a loose or worn belt that needs to be adjusted or changed.
- Check your rack-and-pinion seals for leaks.
Those who have older cars may have to check the recirculating ball unit.
Crankcase ventilation valve:
The valve is clogged or being stuck in a closed position.
Your vehicle could experience engine oil leaks, buildup of sludge or moisture in the engine, black smoke coming from the engine, or increased engine pressure.
Stuck in the open position.
There may be a torn hose in your vehicle. This will cause engine misfiring or rough engine running when in idle, hard engine start, engine oil in the PCV valve or hoses, a lean mixture of air and oil.
This is vital to your BMW N47 engine life. Without the crankcase ventilation system, your vehicle’s engine would leak excessive amounts of unburned fuel and oil. Knowing the symptoms will let you catch an issue related to your BMW’s CCV valve early on.
If you are among the owners of a car equipped with the BMW N47 engine, you must address the vehicle problems and check them periodically.
Because these are the important components in your engine, or it will cause your vehicle to stall in traffic causing a danger to you and the other cars.
Next, let’s quickly recap the timing chain replacement cost so you will have the idea how much you may spend on it.
About BMW N47 Timing Chain
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The timing chain links all moving parts in the car’s engine. Its main job is to operate the intake and exhaust valve gears during the piston’s stroke cycles, helping the engine run properly.
So, what you should look out for is:
Unusual noise / Rattle at rear of engine
Metal shavings in oil
Loss of power
Your engine shakes/vibrates
Your engine misfire
Your engine light is on
Your vehicle has rough idle
You have difficulty starting your vehicle
Any of these symptoms occur, check below replacement cost and visit your mechanics right away.
Replacement and Repairs Cost
If you think that your BMW N47 timing chain will need to be replaced soon, you might be wondering how much does it cost.
On average, you’ll probably pay anywhere from $400-$1,100 that will depend on your model, whether you go to the dealership or a third party, and how long the job takes.
The timing chain being at such an inaccessible place requires the mechanic to take out the engine completely from its bay to get good access to the chain. Taking the engine out is itself a big and hefty task that is not an easy job, so you shouldn't attempt a DIY repair unless you have the experience necessary. Because your timing chain is an essential part of your engine’s operation. Please have a professional fix it for you.
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