The camshaft, located in the head of the block, has five bearing journals. The camshaft must be removed to gain access to the valve springs and tappets. During this operation, special recommendations should be followed to avoid deformation of the shaft under the influence of valve springs. Each engine modification corresponds to a specific camshaft design, so when replacing it, you must carefully check the part number in the catalog.
Periodic adjustment of valve clearances is not required. In cars manufactured before the end of 1985, whose engines are not equipped with hydraulic tappets, valve clearances change slightly over a long service life, their value depends entirely on the degree of wear of the tappets, valves and cams, which in itself implies the need for repairs. Refer to section 4 for valve clearance adjustment for 1.6 and 1.8 liter gasoline engines. Engines installed after 1986 use hydraulic tappets with automatic clearance correction.
Valve springs, their seats and valve stem seals are difficult to access, as they are located deep in the cylinder head. The guidelines below are written with the expectation that users have the right tool and will follow the instructions exactly. When disassembling the valves, it is necessary to pay attention to how the individual parts were installed, such as tappets, crackers, upper and lower spring plates, external and internal valve springs, and shims.
It should be recalled that in engines installed before 1986, valve clearances can be adjusted without removing the camshaft. To do this, you need a special tool that allows you to remove the adjusting washers.
Pic. 183. Cylinder block. Central liners No. 3 and liners No. 5 in serial engines are supplemented with thrust half rings: 1 - main bearing caps; 2 - main bearing cap bolt (65 Nm); 3 - the lower loose leaf of the radical bearing No. 3; 4 - liner without oil groove; 5 - key; 6 - liner with an oil groove; 7 - gasket; 8 - front oil seal cover 9 - oil seal; 10 - stuffing box flange; 11 - bolt (23 Nm); 12 - intermediate shaft seal; 13 - O-ring; 14 - key; 15 - intermediate shaft; 16 - lower thrust half ring; 17 - bearing (needle); 18 - crankshaft; 19 - the upper loose leaf of the main bearing No. 3; 20 - upper thrust half ring
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