Note. see also Section Timing drive - general information, component maintenance.
Location of camshafts
1, 1a, 2, 2a - Upper sliding arms; 5, 6, 7, 8 - Camshafts; 10, 12 - Covers; 13 - Chain tensioner; 14 - Camshaft bearing cap
The dimensions of the camshafts are given in Specifications.
The camshaft covers are sequentially numbered starting from the right exhaust camshaft front cover. The numbers are stamped on the cylinder heads. Bearing caps must be installed in the same position.
Removing
1. Set the piston of the first cylinder to the position 45°before TDC.
2. Remove the top front cover.
3. Mark the relative position of the timing chain relative to the camshaft sprockets.
4. Remove the timing chain tensioner.
5. Remove the upper sliding arms.
6. Remove the timing chain from the camshaft sprockets. Turn the camshafts with a key (1) so that the cams do not press on the hydraulic lifters (see resist. illustration). Turn the right exhaust and right inlet sprocket about 6 teeth in the direction of engine rotation. Rotate the left intake sprocket about 10 teeth in the opposite direction of engine rotation. Rotate the left exhaust sprocket approximately 14 teeth in the direction of engine rotation.
7. Loosen the camshaft bearing caps in series to prevent any one-sided camshaft stresses.
8. Remove bearing caps and camshafts along with sprockets and adjusters.
Installation
Unfolding to the control position of the right camshaft
1 - Fixing rods
3 - Key
1. Lubricate the hydraulic lifters and camshaft bearing journals.
2. Install left hand intake and exhaust camshafts with timing chain on sprockets but without tension.
3. Lubricate the bearing caps with oil, install and tighten their fastening bolts to 10 Nm. 4. Turn the camshaft with a wrench (3) and check for ease of rotation.
5. Turn the left exhaust camshaft with a wrench (3) to the control position. Set the timing chain to the previously marked position, after blocking the camshaft with a rod (1).
6. Turn the left intake camshaft with a wrench (3) to the control position. Set the timing chain to the previously marked position, after blocking the camshaft with a rod (1). The camshaft is in position «backlog».
7. Install the right intake and exhaust camshafts with the timing chain on the sprockets but without tension.
8. Lubricate the bearing caps with oil, install and tighten their fastening bolts to 12 Nm. 9. Turn camshafts and check up ease of rotation.
10. Set the right inlet camshaft to the test position. Set the timing chain to the previously marked position, after blocking the camshaft with a rod (1). The camshaft is in position «backlog».
11. Establish the right final camshaft in control position. Set the timing chain to the previously marked position, after blocking the camshaft with a rod (1).
12. Further installation is made in an order, the return to removal.
13. Check up a control position of camshafts.