In our daily maintenance or repair on cars, we are often troubled by purchasing some bad quality parts or parts don't fit our cars. Then, how to purchase both qualified and suitable automobile flywheel assembly parts? By following, we come to make some introduction on attentions of maintaining or purchasing parts like flywheel ring gears.

Firstly, check the completion of trademark sign. Products like formal automobile flywheel assembly are of qualified external packaging. Letter on package box is clear and overprint is of bright color. On package box and bag, there prints with product name, specification, quantity, trademark, factory name, address and phone-number. Some factories as well print their own signal on flywheel assembly parts. Some important parts such as engine, flywheel ring gears, distributor and fuel injection pump are even matched with instruction manual, certification and inspector chapter so as to guide users on correct usage and maintenance.

Secondly, check geometry size deformation condition on parts. Some parts easy deform because of invalid manufacture, transportation and deposition. When checking flywheel assembly parts, we can roll axel parts for one circle around glass plate to judge whether there is bending by watching joint place light leakage condition between parts and glass plate. When purchase clutch platen steel piece or friction piece, put steel piece or friction piece before eyes to check if there is buckling. When purchase oil seal, its framework face should present round to perform perfect joint with glass plate without flexure. Oil seal without framework should be upright. Grasp with hand to make it deform and it recovers original shape after hand loose. When purchase various pads, we should also pay attention to check geometry size and shape.

Thirdly, see if joint part is flat. Parts like flywheel ring gears often produce burr, indentation, damage or crack in joint parts because of abrasion or knocking during transportation and deposition which affects parts application. Pay attention to it when we purchase.

Fourthly, see if there is erosion on flywheel assembly parts surface. Qualified parts surface both has certain precision and bight clearness. The more important parts, the higher precision they are and stricter package rust-resistant and erosion-resistant is. Pay attention to the checking. Once there is found erosion spot, mildew spot or plastic piece crack or elasticity loss and obvious turning grain on shaft neck surface, parts should be changed.

Fifthly, see if protective surface is complete. Most parts like flywheel ring gears are all coated with protective layer, just as that piston pin and bearing are protected by paraffin wax, piston ring and cylinder liner are coated with erosion resistant oil and are packed by package paper, that valve and piston are sealed with plastic package after dipping in rust resistant oil. Thus, ask for return or change when sealing set is found damaged, package paper is found lost and rust resistant oil or paraffin wax is found run off.

Sixthly, see if glue joint parts are loose. Parts composed of two or over two accessories are pressed packaged, glue jointed or welded. It is not permitted loose phenomenon among them. Give the example, oil pump cylinder and adjustment arm is assembled by pressed packaging. Clutch driven pulley and steel piece are riveting combined. Friction piece and steel piece is riveting jointed or glue jointed. Paper filter framework and filter paper is glue jointed. Electronic equipment wire is welded. Thus, once there is loose phenomenon, ask for change.

Seventhly, see whether rotation parts are flexible. When purchase rotation parts assembly such as fuel pump, rotate pump bearing with hand to feel the flexibility. When purchase rotation bearings, support bearing interior ring with one hand and swirl exterior ring with another. Exterior ring should rotate fast freely and then stop gradually. If rotation part rotates inflexibly, it implies interior part is rust or deformed.

Lastly, we should check whether flywheel assembly parts are lacked. Part lack is quite troublesome. Formal flywheel assembly parts must be complete and perfect so as to ensure smooth assembling and normal operation. If some individual parts on flywheel assembly parts are neglected installation, it would cause assembly parts incapable of normal working and even whole parts discarded completely.