Cylinder Head Rebuild: Wear and Repair Explained скачать в хорошем качестве

Cylinder Head Rebuild: Wear and Repair Explained

Ready to have your cylinder head inspected and serviced? Click through to read all the details on purchasing the service and sending yours in for repair: https://common-motor.com/cylinder-hea... See our full article detailing our Common Motor Cylinder Head Machining Service right here: https://support.common-motor.com/hc/e... What is a cylinder head, and why does it matter? It contains the combustion chambers where power is made, and controls the airflow into and out of the engine via the valve train—a series of valves and springs installed in the head. It also influences engine compression, and overall performance. During an engine rebuild, focus often will fall on the cylinders and pistons, while the cylinder head is often neglected. If this vital component is ignored when rebuilding an engine, there is a good chance that engine will need to come apart again sooner rather than later. Much like a piston inside a cylinder, valves move up and down inside the head thousands of times per minute. Over time, the sealing surfaces steadily wear away causing engine performance to slowly degrade. Although an engine can continue to run like this, neglected service can lead to bent or broken valves which in turn destroy an engine from the inside out. To prevent this type of catastrophic damage, it is important to give your cylinder head its due attention during an engine rebuild. To evaluate your cylinder head when we receive it we first disassemble and clean it. Your cylinder head can be sent in just as it comes off of your engine (minus camshafts and camshaft accessories).Once the cylinder head is clean and disassembled, we give it a good visual inspection and check all of the threads. There’s not much we can do about broken and bent cooling fins, but as long as the damage isn’t excessive it won’t affect overall performance. All of your valves will be replaced as a part of our rebuild service, so we don’t focus too much on inspecting the original valves. Valve guides wear out from the action of the valves moving through them. The overall size and shape changes from this, and must be checked against factory specs. If a valve guide is heavily worn or misshapen, it must be repaired before installing new valves.Valve seats are another component which takes abuse, and the sealing surfaces must be restored when rebuilding a cylinder head. The seats become deformed over time from being beaten by the face of the valve repeatedly. Also if the bike has sat unused for decades, the valve seats often become rough and pitted from corrosion. The main focus of our cylinder head rebuilding service is on the valve seats and guides. By replacing the factory valves with the improved CMC Airlock valves, we are able to eliminate a major variable from the equation. To work properly, the valve seats must be reconditioned to a smooth surface that seals tightly up against the valve, and the new valve must fit inside the guide without excessive free play or any tight spots. Heads will also be "decked" which is a process that involves flattening the head gasket surface to remove all imperfections. A properly decked head gasket surface is needed to create a good seal between the cylinders and combustion chamber on the head. The health of a cylinder head directly correlates to engine performance, and should never be overlooked when doing an overhaul. Send in your cylinder heads to us for evaluation, and rest assured we will give it the attention it needs. A healthy cylinder head makes an engine happy, and a happy engine makes for thousands of miles of smiles! Buy parts and pieces for your vintage Honda motorcycle at common-motor.com _________________________________ Need help with your vintage Honda? Attend the CMC Repair Academy and watch the full playlist of repair videos for your motorcycle:    • CB175/CL175/SL175/CB200/CL200      • CB350/CL350/SL350      • CB360/CL360      • CB450/CL450/CB500t      • CB500K / CB550K / CB550F      • CB750K / CB750F      • CB350F / CB400F   _________________________________ Contents of this video: 00:00 -