Quality Control and Warranty

Uncompromising Quality, Unbeatable Drive

Engine has a great impact on a vehicle's performance, affecting things such as acceleration, max speed, loudness, as well as a chance to start and shut off the vehicle once moving. So engine parts' quality is of critical importance.

Crankshaft is the main driving shaft of internal combustion engine which transmits the power developed by the engine to the various parts of the vehicle. Without crankshaft the vehicle won't even move an inch though the engine will be running. It is the core part of an engine. Crankshafts from PUFENG ENGINE PARTS are manufactured to precise specifications to be well coordinated with other parts like connecting rod, camshaft, flywheel etc. Main journals and rod journals are milled, ground and polished. All holes and passages are CNC drilled. Nitriding or quenching heat treatment is utilized to improve crankshaft's strength. Every piece is dynamic balanced, manually inspected and inspected by micrometer, hardness tester and CMM etc before released for sale.

Cylinder head sits on the top of the cylinder block sealed in place with the head gasket and forming the combustion chamber. Obviously it is subjected to extremes of temperature, which it has to resist. It houses the exhaust and intake valves, the fuel injector and necessary linkages, and passages. Some heads also contain integral ducts and passages for the engine's coolant for transfer of excess heat away from the head. Not surprisingly, good quality cylinder head has to be robust with good sealing capacity, as well as high precision to mate with other parts. This kind of cylinder heads are what PUFENG ENGINE PARTS supplies.

Cylinder block plays a very important role in the engine’s lubrication, temperature control and engine stability. It has to withstand a variety of temperatures and loads so as to maintain the stability and lubrication of the engine. There are a number of oil galleries in engine block that help with the circulation of oil within the engine. Water galleries are also featured to provide cooling to the engine which controls its optimum operating temperature. For this reason, cylinder blocks PUFENG ENGINE PARTS supplies are made of high quality material to avoid shortcomings.

PUFENG ENGINE PARTS cylinder head and cylinder block castings have high castability. Sand moulds or metal dies are applied in casting processes. Chemical analysis and mechanical property inspection are carried out for each batch of casting. The alloy selection and applied alloy proportion are professionally considered via various criteria. High strength resin coated sand cores are used to minimize the number of casting defects (porosity, inclusions etc.) and improve the microstructure of the material (dendritic arm spacing). After numerical control machining, critical dimensions will be inspected by gauge and laser projector. All bolt holes and water holes will be inspected with a genuine quality gasket. 100% gas passages inspection and pressure test for each cylinder head and cylinder block to detect possible defect. 100% vacuum test for each cylinder head to achieve proper valve sealing. Finally, they are completely cleaned and rust-proof treated by automatic cleaning and anti-rust oil spraying machine.

We guarantee that all our engine parts are brand new and interchangeable with the corresponding parts offered by the Original Equipment Manufacturer. We further warranty that all the goods supplied by us are free from defects in material and workmanship. All the spare parts that are defective in material and workmanship are refundable. We shall not be responsible for the wear out or the defects that arise during improper operation or if you use non-standard parts.