The engine is available in two versions: low compression or high compression. The low compression engine is designated by the code "135", and the high compression engine is designated by the code "136". Apart from the difference in compression ratio, which is achieved by using different pistons, both engines have the same design.
The cylinder block, cylinder head and valve cover are cast from aluminum alloy. The cylinder walls are made in the form of cast iron liners installed from below; at the base of each sleeve there are sealing gaskets that prevent coolant from leaking into the pan.
The crankshaft has three main bearings. The clutch and flywheel are attached to a flange on the left end of the crankshaft. A double sprocket on the right end serves to drive the camshaft via a double-row chain. The main and connecting rod bearings have liners.
At the right end of the camshaft is a helical gear that drives the distributor. The camshaft also drives the oil pump via the distributor shaft.
The power feed lubrication system consists of a gear pump that draws oil from the oil pan through a mesh filter. The lubricant then passes through a filter mounted on the cylinder block and is distributed to the various engine components. Some models may use an engine oil cooler, which serves to maintain operating temperature under severe operating conditions.
Fig. 2A.2. Engine lubrication system
1. Mesh filter of the inlet tube; 2. Oil pump; 3. Bypass valve; 4. Cork; 5. Jet (drive chain lubrication); 6. Cork; 7. Jet (distributor drive gear lubrication); 8. Cork; 9. Oil filter; 10. Bypass; 11. Connecting rod oil jet; 12. Oil pressure sensor; 13. Intermittent supply to the valve mechanism; 14. Valve mechanism.