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