Clearances in the valve drive mechanism
Every 10,000 km run, and on a new car after running the first 2000-3000 km, check the gaps «A» (pic. 25) between cams and levers, which should be equal to 0.15 mm on a cold engine for both intake and exhaust valves.
Pic. 25. Valve timing:
1 - camshaft cam; 2 - valve drive lever; 3 - valve oil deflector cap; 4 - valve; 5 - adjusting bolt of the lever; 6 - adjusting bolt locknut.
On a new engine, before performing this operation, check and tighten the fastening of the block head, camshaft bearing housing, intake pipe and exhaust manifold.
Loosen the cylinder head bolts by approximately 30°each and tighten to the value shown in Fig. 26 is fine. The tightening torque of bolts 1-10 must be 115 Nm (11.5 kgf·m), and bolt 11 - 38 Nm (3.8 kgf·m).
Nuts of fastening of the case of bearings of a camshaft tighten uniform effort in the order specified in fig. 27. Final tightening torque of nuts 22 Nm (2.2 kgf·m).
To adjust gaps:
- remove the cylinder head cover;
- turning the crankshaft * clockwise, align the mark «A» (pic. 28) on an asterisk with a label «IN» on the camshaft housing; while the piston of the fourth cylinder is at TDC at the end of the compression stroke and both valves are closed;
- adjust the clearances between the levers and camshaft cams at the exhaust valve of the 4th cylinder (8 cam) and inlet valve of the 3rd cylinder (6 cam); to do this, release locknut 2 (pic. 29) and, turning the adjusting bolt 1, set the required clearance with a flat feeler gauge inserted between the cam and the lever;
- holding bolt 1 in this position with a wrench, tighten locknut 2 to 52 Nm (5.2 kgf·m) and check the gap again;
- turning the crankshaft half a turn, adjust the clearances in the sequence indicated in table 3;
- replace the cover.
After completing the work, check the tightening torque of the ratchet. It should be 122 Nm (12.2 kgf·m).
* It is carried out with a special key for the ratchet or by rotating the jacked rear wheel with the fourth gear engaged and the stops under the front wheels installed.