Removal the valve train components (Mazda CX-5KE)

Attention.

• A hot engine can cause burns. Before starting work, turn off the engine and wait until it cools down.
• If the camshaft is rotated after the drive chain is removed, the valves may hit the piston crown when the piston is at top dead center, causing engine damage. When rotating the camshaft with the drive chain removed, all pistons in the engine must be set to the middle position.
• When turning the camshaft with a wrench on the hexagonal part, the wrench may hit the rocker arm and damage it. To prevent damage to the rocker arm, when holding the camshaft by the hexagonal part, place the wrench closer to the rear of the engine, as shown in the figure, to ensure a safe gap between the wrench and the camshaft lobe.

Note: The width of the hexagonal part of the camshaft is 22-24mm.

Removal

1. Disconnect the negative battery terminal.



2. Remove the decorative engine cover.

3. Remove the fuel injectors.

4. Remove the lower housing.

5. Remove the vacuum pump.

6. Remove the fuel supply pump.

7. Remove the cylinder head cover.

8. Remove the camshaft position sensor.

9. Remove the mudguard.

Note:

: replace the part with a new one after each removal.

apply oil.

10. Loosen the mounting bolts and remove the oil spray pipe from the cylinder head.



11. Remove the clamp and bolt shown in the figure and move the ground cable aside.



12. Loosen the bolts and disconnect the connector shown in the figure, then move the engine control unit to the side without disconnecting the wires from it.



13. Remove soundproofing cover No.1 with rubber seal in the sequence shown in the figure.

Attention.

• During and after the work is completed, it is necessary to keep the drive chain raised away from the sprockets. If the chain falls down, it may jump off the crankshaft sprocket, as a result of which it will be necessary to perform the entire valve timing procedure.
• After completing the work, it is necessary to check the valve timing.

(The primary source is the website: «MazBook»)




14. Loosen the timing chain tension as follows:

Note: Loosen the timing chain tension by securing the plunger to the timing chain tensioner through the service hole in the front engine cover.

Remove the plug from the service hole in the front engine cover.

Note: replace the part with a new one after each removal.

Insert a wire with a diameter of approximately 1.4 mm or a rolled up piece of paper into the hole in the drive chain tensioner housing through the service hole.

Note: Before depressing the timing chain tensioner plunger, insert a piece of wire or rolled up paper approximately 22.5 mm into the engine front cover.

While moving the exhaust camshaft in the direction of the arrow in the figure, using a wrench installed on the hexagonal part, press the plunger of the timing chain tensioner.

Note: As the exhaust camshaft rotates clockwise, the timing chain will tighten slightly, pushing the plunger into the tensioner.

After pressing the plunger into the tensioner, feed the wire or rolled paper further into the hole.

Note:

• By pressing the drive chain tensioner plunger, the wire or rolled paper can be advanced approximately another 8 mm.
• A wire or rolled up paper holds the plunger in the depressed position, thereby relieving tension on the drive chain.

15. Turn the crankshaft clockwise to set the piston of the first cylinder to the top dead center position according to the marks shown in the figure.





16. Use a marker to mark the front engine cover and crankshaft pulley to ensure correct valve timing during subsequent assembly.

Note: The location of the marker mark is not important. The optimal mark will be one that allows you to check the valve timing after assembling the engine.

17. Temporarily screw the cylinder head cover bolt into the position shown in the figure.



18. Holding the exhaust camshaft by the hexagonal part with an adjustable wrench, loosen the camshaft sprocket mounting bolt.





19. Disconnect the sprocket from the exhaust camshaft without removing the drive chain from it.



20. Using a rope, tie the camshaft sprocket with the drive chain to the prepared bolt, as shown in the figure.



21. In two or three steps, unscrew the camshaft cover bolts in the sequence shown in the figure, and remove the camshaft covers.





22. Remove the camshafts.

23. Remove the valve rocker arms from the cylinder head and lay them out in order for installation in their places during subsequent assembly.

24. Remove the hydraulic clearance compensators from the cylinder head and arrange them in order for installation in their places during subsequent assembly.