Technical data

Fig. 17 – Adjustment of the draining valve of the centrifugal oil filter.

3.3.9. Checking the Clearance between the Valves and the Rocker Arms

Check and adjust the clearances between the valves and the rocker arms every 500 ser-

vice hours as well as after removal of the cylinder head retightening the bolts fastening the cylin-

der head and in case of valve hammering.

The clearance between the rocker face and valve stem end on the cold engine shall be as

follows:

a) for the D-243 engine and its modifications:

- intake and exhaust valves: 0.01

+0.002

in (0.25

+0.05

mm);

b) for the D-245 engine and its modifications:

1) intake valves: 0.01

+0.002

in (0.25

+0.05

mm);

2) exhaust valves: 0.017

-0.002

in (0.45

-0.05

mm).

The adjustment shall be performed in the following sequence:

- remove the cap of the cylinder head cover and check the fastening of the rocker-arm

shaft supports;

- turn the crankshaft until both valves of the 1

cylinder are overlapped (the intake valve

of the 1

cylinder is beginning to open and the exhaust valve is finishing to shut) and adjust the

clearances in the forth, sixth, seventh and eighth valves (starting from the fan), then make one turn

of the crankshaft having set the overlapping in the forth cylinder and adjust the clearances in the

first, second, third and fifth valves.

To adjust the clearance, loosen the lock nut of the screw on the rocker of the valve to be

adjusted in accordance with Fig. 18 and, turning the screw, set the proper clearance between the

rocker head and the valve stem end using a feeler gauge. After adjusting the clearance tighten the

lock nut. On completion of adjusting the clearances in the valves replace the cap of the cylinder

head cover.