Warping of the mating plane of the connector head with the cylinder block, not more than, mm: 0.1.
Permissible height of the cylinder head after grinding, not less than, mm: 132.75.
Cylinder head gasket
There are no special inscriptions on the cylinder head gasket for orientation; place the marks on the gasket in the direction of the plane of the cylinder head.
Valve seats
Valve seats are non-removable. If there are signs of burning or wear that cannot be removed by grinding, the cylinder head must be replaced complete with seats.
Valve seat specifications
Valve guides
The valve guides are made of special brass and are pressed into the cylinder head.
Permissible gaps between the end face of the valve stem and the edge of the guide sleeve, mm:
- for inlet valves: 0.10;
- for exhaust valves: 0.13.
Hole diameter in valve guide bushings, mm 8.013-8.035.
Valves
The valves are located in the head parallel above the cylinders vertically and are actuated directly by the camshaft lobes through the tappets. Exhaust valves are not subject to grinding.
Valve characteristics
* 8 brackets indicate the values for the engine model «NF».
Clearances in the valve drive mechanism
Model engines «WH», «KR», «WC», «RT»
The gap between the camshaft cams and shims at a coolant temperature above 35°C should be 0.25±0.05 mm for intake valves and 0.45±0.05 mm for exhaust valves, on a cold engine, respectively 0.20±0.05 and 0.40±0.05 mm.
The gap is adjusted by selecting the thickness of the shims mounted on the upper ends of the pushers.
Spare parts are supplied with shims with a thickness of 3.00 to 4.25 mm at intervals of every 0.05 mm.
Model engines «KU» And «NF»
Clearances 8 in the valve drive mechanism are automatically adjusted by hydraulic tappets.
Valve springs
Each intake and exhaust valve has two springs. The springs are the same for both intake and exhaust valves.
Pushers
The valve lifters are located directly in the cylinder head. Adjusting washers of various thicknesses are installed on the upper ends of the pushers to adjust the thermal clearances of the valves, with the exception of the engines of the models «KU» And «NF».
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