General information
Four-stroke, four-cylinder, in-line petrol engine, transversely mounted at the front of the vehicle.
Main technical characteristics
Cylinder head
The cylinder head is cast from an aluminum alloy. The head has multi-sphere combustion chambers. The valve seats and guide bushings are insertable. In the upper part of the cylinder head there are three supports for the camshaft journals. The supports are detachable. The upper half is in the bearing housings, and the lower half is pressed into the cylinder head. The holes in the supports are machined together with the bearing housings, so they are not interchangeable.
Cylinder head height measured between parting planes, mm: 90.5.
Reduction in cylinder head height during grinding, mm: 0.20.
Non-flatness of the cylinder head surface adjacent to the block, mm: 0.15.
Valves
The valves are arranged in a V-shape in the cylinder head. The valves are actuated by the camshaft cams via rocker arms.
Valve characteristics
Clearances in the valve drive mechanism: The normal clearance between the end of the rocker arm adjusting screw tip and the end of the valve stem, measured with a feeler gauge on a hot engine, is 0.25 mm for intake valves and 0.30 mm for exhaust valves.
Valve seats
Valve seats are cast iron, inserted.
Bevel angle: 45°.
Working chamfer width, mm: 1.4.
When pressing the valve seats into the cylinder head sockets, the end of the valve stem relative to the support surface of the valve spring should protrude by 42.4 mm (maximum permissible value 43.9 mm).
Valve guide bushings
Inner diameter, mm: 8.063-8.083.
Valve springs
Each intake and exhaust valve is equipped with one spring with the same characteristics.
Length in free state, mm: 43.3.
Maximum length in the settled state, mm: 42.0.