Genuine Mazda Valve Lifter

Mazda 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.
• Valve Lifters
  Z501-12-183A
  Q: How to remove and install the Camshaft, Rocker Arm and Valve Lifter on Mazda Protege?

  A:

  The first step to take is to remove either the distributor (until 1998) or the camshaft position sensor (after 1998) to remove the valve cover. The timing covers, timing belt, and camshaft sprocker(s) should then be removed. Check the clearance of the camshaft(s) using a dial indicator and in the event that the clearance is greater than what is required, change the camshaft thrust plate, camshaft, or the cylinder head. In the case of SOHC engines, remember that, the 1.6L and 1.8L models have hydraulic lash adjusters and so no additional valve adjustments would be necessary after fitting it. Mark or number parts to be kept aside so that they can fit back correctly. Loose the rocker arm bolts one at a time, and then detach the rocker arm and rocker shaft assembly and store them up to re-fit later. To take out the camshaft, but not the cylinder head, disconnect the distributor, air cleaner assembly, and relocate the underhood fuse box, and then just by simply pulling straight out and unscrewing the oil seal, the camshaft can be removed. In the DOHC type, 1.8L version has two overhead cams with hydraulic lifters and the 1.5L and subsequent models need shim adjustments. Take off the camshaft sprocket bolts and sprockets, loosen and take off the camshaft bearing caps, labeling the locations of their position to be used again. Record the depth of the old oil seal to install it properly in the future. Remove all the valve lifters or shim/bucket lifters and place them in labeled containers. Check all components to determine whether they are damaged, check camshaft journals and lobes, and oil clearance with Plastigage. To install, use clean engine oil over the new camshaft oil seal and into the cylinder head bore and then install the camshaft and rocker arm assembly, making sure the orientation is correct. Installing the camshaft sprocket and timing belt Installing the camshaft sprocket and timing belt involves tightening the rocker arm bolts. With DOHC engines, lubricate hydraulic lifters and place them in the correct position and then fit the camshafts and bearer caps sequentially and ensure that the bolts are screwed on in this order. Last are the camshaft sprockers, timing belt, and the distributor which should be installed and all things installed in the opposite order as they were removed, and the engine should be started to ensure that everything is working out.