What parts are typically replaced in a reconditioned BMW 7 Series engine?
The BMW 7 Series is the epitome of luxury and performance in the entire range of BMWs. But just like any other vehicle in the world, these eventually need reconditioning when their engines get older to restore performance and reliability. Due to a rising desire by many BMW enthusiasts to extend their cars’ lives without going for full engine replacement, reconditioned engines have become popular lately. The following article deals with the specifics of the parts replaced in a reconditioned BMW 7 Series engine. This will also help an enthusiast and/or a prospective buyer understand the serious amount of work that goes into such high performance engines.
Cylinder Heads and Valves
Cylinder heads are one of the most major components replaced during the reconditioning of a BMW 7 Series engine. With time, the cylinder head can crack or warp due to the high temperatures and stress involved. Reconditioning entails the examination and replacement of such damaged cylinder heads for optimal compression and performance.
Intake and exhaust are done by valves, which tend to wear out. Technicians replace the worn-out valves and reseat them to ensure a perfect seal for improved fuel economy and power delivery. Replacement of valve springs and seals will help avoid oil leaks and give consistent performance of the engine. This is absolutely necessary for restoring the smooth and powerful performance of BMW engines.
Pistons and Piston Rings
Pistons are a critical link in the process of internal combustion, which converts fuel into mechanical energy. With time, pistons may crack or wear out, which will affect the efficiency of the engine. In a reconditioned BMW 7 Series engine, damaged pistons are replaced with new ones to restore compression levels.
Seals at the piston rings against the cylinder wall are also replaced. Thus, bad rings cause loss of compression and oil consumption because of their worn-out condition. By doing this replacement, these technicians make sure that upon receiving a reconditioned engine, it shows optimal power and efficiency attributed to high-class engines by BMW.
Crankshaft and Bearings
The other very important and most commonly replaced part in a reconditioned engine is the crankshaft. It basically converts the linear motion of the pistons into rotational motion to drive the vehicle. After a while, the crankshaft can wear out and become imbalanced, causing it to vibrate.
Reconditioning may include the machining of the crankshaft to its shape or a completely new one. Main bearings and connecting rod bearings, which support the crankshaft, are replaced. These bearings ensure smooth rotation and reduce friction, which is very important in maintaining the longevity and performance of the reconditioned engine.
Camshaft and Timing Chain
The camshaft operates the opening and closing of valves. Its precision of operation is very crucial for the performance of the engine. Worn or damaged camshafts are replaced on a reconditioned BMW 7 Series engine in order to ensure proper valve timing.
Other common replacements include the timing chain, which coordinates the movement of the camshaft and crankshaft. A stretched or worn timing chain results in poor performance and may lead to catastrophic engine failure. By replacing both the camshaft and the timing chain, technicians restore the precision and reliability that BMW engines have become synonymous with.
Oil Pump and Gaskets
The oil pump is critical for maintaining proper lubrication throughout the engine. A failing oil pump can lead to insufficient lubrication, causing extensive engine damage. In reconditioned engines, the oil pump is typically replaced to ensure consistent oil flow and pressure.
The replacements also include the gaskets that provide seals between various components in the engine. Common replacements include the head gasket, valve cover gasket, and oil pan gasket. Such replacement prevents oil and coolant leakages, hence preserving the integrity and performance of the reconditioned engine.
Fuel Injectors and Ignition Components
Fuel injectors have the job of delivering the exact amount of fuel into the combustion chamber. Over time, these injectors become clogged or fail; hence, the engine starts running poorly. In a reconditioned BMW 7 Series engine, the fuel injectors are either cleaned or replaced to restore fuel delivery.
Other ignition components replaced include spark plugs and ignition coils. These are some of the parts necessary for generating the spark that has to ignite the air-fuel mixture. In this respect, replacing such components will make combustion easy and smooth, hence improving overall performance of the reconditioned engine.
Cooling System Components
It is the potential contribution of a cooling system helps avoid the overheating problem. Common replaced parts include a thermostat, water pump, and radiator hoses during reconditioning. It is an unhappy or unsuitable cooling system for causing failure and making very heavy damages to the motor.
Technicians also inspect and replace coolant passages inside the engine block if needed. Because these components are covered, operating temperatures are at their optimum in this remanufactured engine; hence, reliability and durability are guaranteed. BMW engines pride themselves on their precision engineering, and a good cooling system plays a key role in maintaining this prestige.
The Turbocharger and Exhaust System
Most of the models in the BMW 7 series have turbocharged engines. After some time, it undergoes wear and tear; sometimes it leads to performance reduction or failure. In a reconditioned engine, rebuilding or replacement of the turbocharger will be done to restore the boost again.
This further includes an inspection and replacement of the catalytic converter and the exhaust manifold, if need be. These components are really important in view of lessening the level of emissions through the engine. By replacing all these worn-out turbocharger and exhaust components, a technician will make sure the reconditioned engine works to give power and efficiency expected in a BMW.
