Contents: Removal ↡ Installation ↡
The camshafts are located in a separate housing in the cylinder head. The opposite bearings of the intake and exhaust camshafts have a common cover that covers both camshafts. Thus, both camshafts are always disassembled together.
Removal
Camshaft bolts
1. Remove the cylinder head cover.
2. Set the piston of the first cylinder to TDC ignition. To do this, set the gearbox to idle and turn the crankshaft clockwise using the sprocket attached to the crankshaft by the central bolt of the belt pulley. Turn the crankshaft until the "OT" mark on the belt pulley is under the pointer (arrow).
Caution! Do not rotate the engine in the opposite direction. Never turn the shaft by the timing gear mounting bolt.
3. In this position, insert a locking pin or other suitable rod with a diameter of 6.75 mm into the hole of the intake camshaft gear (2) through the first camshaft bearing cap, or turn the crankshaft a full revolution and insert the rod.
4. Mark the position of the timing gear and the control chain relative to each other using varnish or a graver, after first wiping this area on the chain gear with a rag.
5. Remove the chain tensioner.
6. Unscrew the mounting bolts and remove the exhaust camshaft gear. To unscrew the bolts, you will need a T40 socket wrench.
Caution! The control chain must remain engaged with the crankshaft and fuel pump gears. Otherwise, the valve timing will change, which may cause engine malfunctions.
7. Set the control chain aside and wire it to the cylinder head.
8. Number the camshaft bearing caps in order so that they can be installed in the same place during subsequent installation.
9. 2.5L engine: Unscrew the camshaft bearing caps.
Attention! The camshafts are very fragile. To avoid damaging them, strictly follow the disassembly order: first, unscrew all bearing bolts 1, 3, 4 and 6 (arrows). Then alternately unscrew the bolts of both bearing caps 2 and 5 (respectively by 1/2 turn), until the resistance disappears (see fig. Camshaft bolts).
10. 2.2L engine: First unscrew bearing caps 1, 3 and 5. Then loosen bearing cap bolts 2 and 4 in stages (respectively by 1/2 turn), until the resistance disappears.
11. If necessary, remove the tappets and inspect for external damage (presence of scratches), replace if necessary. To pull out the pusher, a siphon-pusher is used in the workshop, which can be made at home from a suction cup of a wall hook.
Installation
Attention! When replacing the camshaft, use a shaft with the same index. The index is stamped next to the middle bearing.
1. Clean the camshafts and bearing caps thoroughly with cleaning gasoline and lubricate with engine oil. If the tappets were removed, lubricate them with oil and install them in the cylinder head in the same position as before disassembly.
2. Check the washers for axial fixation of the camshaft in the grooves of the middle bearing; replace if necessary.
3. Lubricate the camshafts with engine oil and insert them into the cylinder head, with both holes (3) (d = 1.5 mm) located in the timing gears opposite each other. The rod can also be installed in this position.
4. Install the camshaft bearing caps in accordance with their numbering and tighten evenly, in the reverse order of removal, to a torque of 15 N·m.
5. Insert the rod into the intake camshaft flange.
6. Install the camshaft sprocket with the chain placed on it onto the exhaust camshaft and tighten it with a new bolt to a torque of 20 N·m. The marks on the control chain and sprocket must match.
Caution: Remove the pin from the sprocket.
7. Install the chain tensioner with a new sealing ring.
8. Install the cylinder head cover and complete the engine.