Removal and installation the camshaft. Models 318tds, 325td/tds (BMW 3 Series E36)

Since this work on a six-cylinder engine 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. Removing the camshaft with the cylinder head removed is described here. 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: 0.04-0.081 mm; radial clearance: 0.15-0.33 mm.

Removal

Remove the cylinder head.

Six-cylinder diesel engine:



To remove the camshaft, you will need the BMW 113320 tool. It is designed to hold all the camshaft bearings in the installation position when the bearing shells are removed. Place the tool and screw it in place with the cylinder head cover bolts, see the figure.

Press the bearing caps by turning the shaft with the eccentrics of the device. Unscrew all the bearing cap bolts.

Remove the device.



Four-cylinder diesel engine: crosswise from inside to outside in several 1/2-turn passes, to avoid camshaft misalignment, unscrew the camshaft bearing covers evenly.

Remove the bearing caps and camshaft. The bearing caps are marked 1 through 7 (Four-cylinder engine: from 1 to 5) from the exhaust valve side.



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, between installing the camshaft and installing the cylinder head, a pause should be taken: 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 camshaft so that the inlet and outlet valves of cylinder 1 are facing upward.

Six-cylinder engine: Install the bearing shells in accordance with their markings, the covers must be in their original places.

Tighten the camshaft bearing caps evenly, crosswise from the inside out, in several ½ turn passes.

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

Install the cylinder head.

(The original text is available on the website BMWMAN)