Removal and installation the camshaft. Models 318is/ti, 320i, 325i, 328i (BMW 3 Series E36)

Since this work requires a special BMW tool, it is recommended that this work be carried out at a workshop. The camshaft can be removed either with the cylinder head removed or with the cylinder head installed. Here is a description of how to remove the camshaft with the cylinder head removed. This work can also be carried out without removing the cylinder head, but all work up to and including unscrewing the cylinder head, as described in the section "Removal and installation the cylinder head".

If it is necessary to take measurements on the camshafts. The specified values of axial clearance: 0.15 - 0.33 mm; radial clearance: 0.02 - 0.061 mm.

Removal

Remove the cylinder head.



To remove the camshaft, you will need the BMW 113260 tool (318is: 113270). It is designed to hold all camshaft bearings in the installation position when the bearing caps are removed. The instructions for performing the work operations apply to both camshafts, the order of removal is immaterial.

Remove the spark plugs.

Place the device and tighten it into the threaded holes of the spark plugs with a tightening torque of 25 Nm.





Press the bearing caps by turning the shaft with the eccentrics of the device. The figure shows a six-cylinder engine.

Remove all bearing cap bolts.

Remove the device.



Remove the bearing caps and camshaft. The bearing caps are marked A1 to A7 (3181 to A5) for exhaust camshaft and from E1 to E7 (3181 to E5) for the intake camshaft. When installing, the covers must be installed in their original places.



If required, for example when valves need to be removed, remove the bearing plate assembly together with the valve tappets.

Caution: If the valve tappets are not secured, they will fall out of the bearing plate. BMW service stations use a suction cup to secure the tappets, which is placed on top of the tappet. When removing the tappets from the bearing plate, they must be reinstalled in their original positions.

Caution: Keep the removed valve tappets upside down for no more than 10 minutes, as the oil filling will slowly leak out and the compensator will become inoperative.

Installation

Caution: When the camshaft is removed, the following should be taken into account: Without load from the camshaft, the hydraulic valve lifters expand and after installation they need some time to return to their original size. Because of this, the valves can remain open longer than determined by the camshaft adjustment and sit on the pistons. Therefore, a pause should be observed between installing the camshaft and installing the cylinder head: At +20°C (room temperature): 4 minutes; at +10°C: 11 minutes. After installing the cylinder head, wait another 30 minutes before starting the engine.

If the camshaft was removed with the cylinder head removed, turn the crankshaft by the hexagon of the belt pulley in the direction of engine rotation (to the right) by approximately 30° beyond the top dead center. As a result, none of the pistons occupy their top position and the valves do not sit on the pistons. Insert the camshaft and maintain the specified pauses. Only then return the crankshaft to the top dead center position and install the chain, see section "Removal and installation the cylinder head".



Check the valve lifters for wear (scratches) and replace if necessary.



Lubricate the camshaft bearings with engine oil and insert the camshafts so that the inlet and outlet valves of cylinder 1 are directed towards each other.

Note: The difference between the intake camshaft and the exhaust camshaft: The sprocket flange on the exhaust camshaft has a recess. In addition, there are 2 stamped letters between the flange and the 1st cam. 1st letter: A = exhaust camshaft, E = intake camshaft; 2nd letter: A = engine 3251 produced before August 1992, D = 3251 produced since September 1992.

Make sure that there are centering bushings "3" on the bearing studs 2 and 7 (318is: 2 and 5).

Place the bearing plate with the valve tappets inserted into the cylinder head. The bearing plate of the exhaust camshaft has the marking "A" in place "4", and the bearing plate of the intake camshaft has the marking "E".



Place the bearing shells in accordance with their markings; the covers should remain in their original places.

Place the fixture and press the bearing shells.

Tighten the bearing shells to a torque of 15 Nm.

Unload and remove the device, screw in the spark plugs.

Install the cylinder head.