Genuine Mazda 3 Valve Lifter

Mazda 3 Valve Lifter Parts and Q&A

• Valve Lifters
  1F20-12-300B
  Q: How should camshafts and valve lifters be removed and reinstalled during a procedure on Mazda 3?

  A:

  At any time that the cams are to be pulled to perform a procedure, it is recommended to verify the valve clearance prior to breaking them down so that any new lifters necessary are available to be ordered out of a dealership. Start by taking out the Timing Chain, marking the location of the no.1 cylinder cam lobes and locations of the slots in the ends of the camshafts to line up with the slot during reassembly. Then, taken-out the camshaft sprockets and label the camshaft phaser/sprocket on the intake camshaft to be installed in the correct position. The Variable Valve Timing models have various camshaft sprocket bolts that are required to be aware of, with appropriate washers being used as necessary. The camshaft carrying caps are numbered and should be returned to their original place, the side with the number face upwards. Relax the camshaft bearing cap bolts gradually, then pull the caps off taking note of their markings, and take out the camshafts. Store lifters in small containers and do not mix them. Look at the camshafts and lifters, and then feel their wear and roundness, and take the outside diameter of all lifters and see whether they have any appreciable differences. Inspect the camshaft lobes visually and inspect the bearing journals visually. Measure the diameter of each journal and measure the degree of running clearance of the bearing journal with Plastigage. In case one of the bearings becomes worn out of service, it may be required to replace a camshaft. In order to measure camshaft endplay, check with a dial indicator with the bearing surfaces cleaned. To install, make sure that the crankshaft is at TDC, lubricate the lifter bores and camshaft bearing surfaces, and then place the lifters and camshafts in place using care to ensure that they fit in their original position. Clean all mating surfaces and oil the camshaft journals and lobes and then put the bearing caps into their normal positions. Install the sprockers to the camshafts, in sequence to the required setting of camshaft bearing cap bolts, and when installing the camshaft bearing cap bolts, it is important to install the various washers as necessary. Install the Valve Cover after finishing the reassembly process which consists of replacing the timing chain and adjusting the valve timing, and the valve clearance.