Question 1

How should camshafts and valve lifters be removed and reinstalled during a procedure on Mazda 3?

Accepted Answer

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.

Question 2

How to remove and install the valve cover and camshaft while ensuring proper timing and inspection on Mazda MPV?

Accepted Answer

To change the valve cover, the first step is to remove the distributor and position the engine at TDC with cylinder number one then remove the rocker arm assembly with the camshaft bearing caps numbered, if not numbered then number it. To avoid the tensioner collapsing once the sprocket has been removed, fit a special retaining tool between the timing chain by the tensioner so that the cord or wire of the tool does not lose its way in the timing chain cover. The next step is to loosen the camshaft sprocket bolt and the distributor drive gear without allowing the camshaft to move using a screwdriver. Unscrew the timing chain and camshaft sprocker and remove the camshaft and clean it. To check, investigate endplay of the camshaft by clamping the camshaft with caps and measuring the movement with a dial indicator and comparing them with the specification. Measure camshaft run out with V-blocks and dial indicator and replace the camshaft where the run out is out of specification. Inspect the wear and wear cap of the camshaft bearings and alternate these, and check the height of the cam lobes by a micrometer with reference to wear or damage. Check the wear of the rocker arms and the difficulties of lubrication and be sure to lubricate the new parts before fitting them in. Installation To install, clean all the parts, lubricate the journals and the camshafts bearing surfaces and lower the camshaft carefully with the dowel pin facing up. Install the rocker arm and camshaft sprocker with timing chain making sure that the timing is correct. Turn the crankshaft by hand until the timing marks appear coincidental following two revolutions and in case of resistance examine the valve timing. Last but not the least: Do the reversal of steps of installation.

Genuine Mazda Camshaft

96 Camshafts found

Mazda Camshaft Part Number: L3E3-12-420

Mazda Camshaft Part Number: AJ95-12-440

Mazda Camshaft Part Number: PX13-12-420

Mazda Camshaft Part Number: PX13-12-440

Mazda Camshaft Part Number: PXNS-12-440

Mazda Camshaft Part Number: AJ95-12-430

Mazda Camshaft Part Number: PEP8-12-440

Mazda Camshaft Part Number: AJ03-12-450A

Mazda Camshaft Part Number: AJTM-12-420

Mazda Camshaft Part Number: LF01-12-421A

Mazda Camshaft Part Number: CA01-12-420

Mazda Camshaft Part Number: CA01-12-440

Mazda Camshaft Part Number: CA01-12-450

Mazda Intake Camshaft Part Number: AJTT-12-420A

Mazda Camshaft Part Number: PX17-12-420

Mazda Camshaft Part Number: PE01-12-420

Mazda Camshaft Part Number: PEES-12-440

Mazda Camshaft Part Number: PEJE-12-440

Mazda Exhaust Camshaft Part Number: AJ57-12-450B

Mazda Camshaft Part Number: CA01-12-430

Mazda Camshaft

Mazda Camshaft Parts and Q&A

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