 printable version
Engine
On models with engines in 1988 set a 12-valve cylinder head. Structural differences head consists in that each cylinder have three valves (two inlet and one outlet). Drive valves through hydraulic jacks of backlashes of valves, eliminating the need to periodically adjust valve clearances. Basic operations of maintenance and repair of cylinder head remained the same, but there are features that are listed below.
Valve Actuator
| Fig. 15.4. The cylinder head (12-valve): 1 - crackers; 2 - the top plate of the valve; 3 - spring; 4 - valve stem seal; 5 - the bottom of the valve plate; 6 - The front cover; 7 - valves; 8 - cylinder head gasket; 9 - cylinder head; 10 - a bolt of fastening of the cylinder head; 11 - camshaft; 12 - Back Cover; 13 - the camshaft bearing caps; 14 - hydraulic jacks of backlashes of valves; 15 - valve control mechanism assembly; 16 - the cylinder head cover
|
Features of dismantling due to the fact that the camshaft bearing caps are under the rocker arm shafts and rocker arms are mounted to the hydraulic jacks of backlashes of valves (Fig. 15.4). After removing the rocker arm assembly with the shaft remove the camshaft bearing caps
| Fig. 15.5. Removing the hydraulic jacks of backlashes of valves of the rocker
|
Check the condition of working surfaces of hydraulic jacks of backlashes of valves. Take them out with your fingers (Fig. 15.5). Do not remove the hydraulic jacks of backlashes of valves without the need, as you can easily damage the O-rings.
| Fig. 15.6. Installation of hydraulic jacks of backlashes of valves after filling the cavity with clean engine oil into the yoke
|
Fill the hydraulic jacks of backlashes of valves clean engine oil, and carefully, so as not to damage the O-rings, insert the hydraulic jack in the balance beam (Fig. 15.6).
| Fig. 15.7. Proper positioning of the rocker arm
|
Gather with rocker shafts so that the sample at the ends of the shafts were directed toward the rear of the engine (in the shafts of the intake valves twice the oil channels in the shaft than the exhaust valves) (Fig. 15.7).
| Fig. 15.8. Arrangement of the oil duct (1) on the bearing cover of the camshaft ?��3
|
After installation, set the camshaft bearing caps so that the arrow points to the front of the engine. Oil channel on the bearing cover ?��3 must be from the side, as shown in Fig. 15.8. Install the shaft assembly with a yoke, ensure the correct orientation rocker and dividing bushings and not in contact with the camshaft bearing cap.
Toothed belt
| Fig. 15.9. Toothed belt: 1 - the top casing of a gear belt; 2 - the bottom casing of a gear belt; 3 - crankshaft pulley; 4 - slinger; 5 - toothed belt drive pulley; 6 - roller mechanism of a tension of a gear belt; 7 - roller and spring mechanism of a tension of a gear belt; 8 - a pulley of a camshaft; 9 - toothed belt
|
| Fig. 15.10. The combination of the arrow with the number 1 on the camshaft pulley with a groove before removing the toothed belt
|
Make sure that the arrow with the number 1 on the camshaft pulley is aligned with the notch on the rear belt cover (Fig. 15.10). If necessary, align the label. Loosen the retaining bolt, take the left tensioner by loosening the toothed belt tension and then tighten the clamp bolt. Remove the timing belt. Make sure that the arrow with the number 1 on the camshaft pulley is aligned with the notch, and the label on the drive belt pulley is aligned with the pointer on the front cover. Make sure that the spring tensioner is fully stretched, and the locking bolt is securely tightened. Establish a belt, wearing it on the oil pump pulley and tensioner pulley in between. Loosen the bolt tensioner. Rotate the crankshaft two turns in the direction of working rotation and ensure that the arrow with the number 1 on the camshaft pulley is aligned with the notch, and the label on the drive belt pulley is aligned with the pointer on the front cover. If the labels do not match, remove the belt and try to install it. Tighten the retaining bolt of the timing belt tensioner torque. Check the belt tension on the magnitude of its trough. If the tension is not correct, release the lock bolt and adjust the tensioner to the desired deflection of the belt, and then tighten the bolt torque. Install the timing belt covers.
| 
