Engine components ONS
1 - exhaust manifold, 2 - thermostat, 3 - thermostat housing, 4 - camshaft toothed pulley, 5 - toothed belt housing, 6 - toothed belt, 7 - lever, 8 - valve spring, 9 - cylinder head, 10 - piston, 11 - engine cylinder block, 12 - coolant pump, 13 - ignition distributor, 14 - fuel pump, 15 - V-belt, 16 - V-belt pulley on crankshaft, 17 - toothed pulley on crankshaft, 18 - toothed pulley on intermediate shaft, 19 - crankshaft front cover, 20 - intermediate shaft front cover, 21 - intermediate shaft thrust plate, 22 - intermediate shaft, 23 - crankshaft, 24 - oil pump, 25 - cover cylinder head, 26 - camshaft, 27 - camshaft thrust plate, 28 - intake manifold, 29 - crankcase ventilation system breather, 30 - oil separator, 31 - oil pressure sensor, 32 - oil filter, 33 - crankshaft rear oil seal, 34 - crankshaft thrust half ring, 35 - oil sump, 36 - oil drain plug
Cylinder Head Cover Fastening Elements (Old Type)
A, B – pressure plates,
C – oil gasket
Cylinder head cover fastening elements (new type).
A, B, C, D – pressure plates
Cylinder Head Cover Bolt Tightening Sequence
Checking valve clearances
1 – lock nut, 2 – adjusting bolt, 3 – spring, 4 – cam, 5 – pusher (lever), 6 – plate, 7 – valve, 8 – valve spring
Adjusting valve clearance
1 – cam, 2 – valve tappet, 3 – adjusting bolt, 4 – lock nut
Checking and adjusting the valve clearance is performed on a cold engine.
Adjusting valve clearance
1. Remove the air filter, mark and disconnect the high tension wires from the ignition distributor and spark plugs.
2. Remove the cylinder head cover by unscrewing the ten bolts that secure it (in the reverse order to that shown in Fig. Cylinder head cover bolt tightening order).
3. Remove the spark plugs to make it easier to turn the engine crankshaft.
4. Turn the crankshaft (in the direction of its working rotation) until the cam of the valve being checked is positioned upward.
5. Using a feeler gauge, check the clearance between the tappet and the cam of this valve (see Fig. Checking valve clearances). The clearance measured in a cold engine condition between the valve stem and its tappet should be 0.20 mm for the intake valve and 0.25 mm for the exhaust valve.
6. If necessary, adjust the valve clearance by unscrewing the lock nut and turning the clearance adjustment bolt (3) accordingly (see Fig. Adjusting the valve clearance).
7. Similarly, check and, if necessary, adjust the clearances of the remaining valves.
8. After checking and adjusting the valve clearances, install the head cover with a new gasket and tighten the ten cylinder head cover mounting bolts to the appropriate torques in the order shown in Fig. Cylinder head cover bolt tightening order.
9. Screw in new spark plugs.
10. Connect the high tension wires to the ignition distributor and spark plugs.
11. Install the air filter.