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Flycut rusty surface3/27/2023 It should also be done carefully to ensure that the flywheel turns true on the lathe. Setting up a flywheel on a lathe takes time. The other method of resurfacing is by cutting. Water-based coolants must have a rust inhibitor to avoid rust spots from building up on a resurfaced flywheel. It is also important to use the correct coolant for good cutting action and long stone life. Hard stones, on the other hand, are recommended for cast iron flywheels. Softer stones are ideal for grinding forged steel flywheels. The latter are more costly but they last longer. Another option is dry grinding with CBN stones. To achieve the proper surface finish, wet grinding with silicone carbide stones can be done. A flywheel depth gauge is needed to measure the amount of recess before and after resurfacing. When a stepped flywheel is used such as in Honda and Volkswagen, same amounts of metal must be removed or shaved off on both surfaces to maintain the correct clutch height and pressure. A dedicated grinder should be used for a stepped or recessed flywheel which needs to be ground. However, a head and block grinding equipment can only handle flat flywheels and consumes more time to set up than a dedicated flywheel grinder. There is actually a dedicated flywheel grinder, but grinding can also be done using a head and block grinding machine. It usually takes 3 to four minutes to grind a flywheel’s surface. A grinder removes the hard spots, leaving a smooth and homogenous surface. Most prefer the grinding method for resurfacing most flywheels. There are two methods being used in resurfacing flywheels: through cutting or grinding. How long does it take to resurface a flywheel? In many cars, it means the engine must be removed and reinstalled to perform this job. When too much metal has to be taken off during the resurface, the part will be too thin, and will fail to meet the specifications of the manufacturer for proper operation, weight and safety.īecause the flywheel is connected to the crankshaft of the engine, the transmission and the engine should be separated to remove the flywheel for a resurface. It is highly recommended for you to stop using your car when the clutch begins to slip, and have it fixed immediately. The amount of metal cut off during resurfacing flywheels depend on the depth of the hot spots. Doing so will expose fresh metal to the disk, and gives a slight roughening of the surface which will enhance the grip over the previously polished surface. Resurfacing flywheels refer to the process when the part is fixed to a machine that is able to cut a very thin layer of metal off the surface. So what does it mean to resurface a flywheel? This is why manufacturers also recommend resurfacing flywheels when the throwout bearing, pressure plate or disk is replaced. As a result, the hardened areas are not evenly distributed across the surface. Hot spots happen due to uneven application of heat. It gets too hard or in some cases, it develops cracks and blisters called “hot spots” on the surface. Failure to resurface a worn flywheel will cause premature wear of the newly installed clutch and most clutch suppliers won’t honor a warranty claim if the flywheel was not resurfaced or was resurfaced improperly upon installation of the clutch.Īs mentioned previously, eventually, the surface of the flywheel gets damaged due to friction and heat. But if it no longer is in a condition like when it was new, then it needs to be resurfaced prior to installing the new clutch. If the surface is flat and without defects, there is no need for resurfacing flywheels. The inspection will include: using a straightedge and feeler gauge to measure the flywheel’s flatness, checking the surface for cracks, and checking for grooving or hard spots which refer to discolored areas that are slightly lifted above the surrounding surface. Upon removal of the old clutch, the flywheel should also be thoroughly inspected to check its condition. The additional thermal stress can result in warpage, heat cracks and the buildup of hard spots in the flywheel’s surface. When the clutch begins to slip, more heat is produced. The flywheel’s mass absorbs and dispels the heat. Normal clutch operation produces plenty of heat and friction.
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