We remove the camshafts when repairing the cylinder head, when it is necessary to remove the camshafts

We replace the camshafts if there is increased wear of the necks and camshafts during engine operation

We prepare the car for the task and disconnect the negative battery terminal

We remove the cylinder head cover, as indicated in the article "How to replace the cover and cylinder head gasket Mazda 6"

We remove the gears of the camshafts by tying a chain to them and securing them together with it by the edge of the cover of the gas distribution mechanism drive

Removing and installing Mazda 6 engine camshafts

Before removing the bearing covers of the camshafts of the 2.0 and 2.5 l engine, it is also necessary to remove the solenoid valve of the phase regulator by disconnecting the wiring block and unscrewing the bolt fastening to the bearing cover of the intake camshaft

Removing and installing Mazda 6 engine camshafts

Unscrew the bolts securing the camshaft bearing covers, and remove the bearing covers

Removing and installing Mazda 6 engine camshafts

Serial numbers are applied on the covers of camshaft bearings

You need to record their location, depersonalization is prohibited

The labels of the lids are applied to the outside of the lids

Removing and installing Mazda 6 engine camshafts

Removing the camshafts

Inspecting the camshafts

The surfaces of the support necks and cams should be undamaged and well polished

If traces of jamming, overheating, deep risks or wear in the form of faceting are found on the working surfaces of the cams, replace the shafts

In workshops equipped with special tools and devices, it is possible to check the radial runout of the camshaft necks. If the runout is more than 0.02 mm or the necks are misaligned, replace the shaft, as its correction is not allowed.

Lubricate the camshaft beds with clean engine oil and place the camshafts in them in such a position that none of the cams rests with the highest part of its toe on the adjusting washer of the valve tappet.

Install the camshaft bearing covers.

Clean the slots of the lid and the sealing surface of the block head from the remnants of the old gasket.

Removing and installing Mazda 6 engine camshafts

Tighten the bolts securing the covers of the camshaft bearings in the order shown in the photo, in three stages:

- tighten the bolts evenly by half a turn each until the bearing covers come into contact with the cylinder head surfaces;

- tighten with a torque of 7 Nm (0.7 kgf m);

- turn on 45°.

Install the remaining removed parts in the reverse order of removal.