Valve drive
Pic. 15.4. cylinder head (12-valve): 1 - crackers; 2 - the upper plate of the valve; 3 - spring; 4 - oil deflector cap; 5 - lower plate of the valve; 6 - front cover; 7 - valves; 8 – laying of a head of the block of cylinders; 9 – a head of the block of cylinders; 10 – a bolt of fastening of a head of the block of cylinders; 11 - camshaft; 12 - back cover; 13 - camshaft bearing caps; 14 - hydraulic valve clearance compensator; 15 - valve control mechanism assembly; 16 – a cover of a head of the block of cylinders
Features of disassembly are due to the fact that the camshaft bearing caps are located under the rocker shafts, and hydraulic valve clearance compensators are mounted in the rocker arms (pic. 15.4).
After removing the rocker arm assembly with the shafts, remove the camshaft bearing caps
Pic. 15.5. Removing the hydraulic valve clearance compensator from the rocker arm
Check the condition of the working surfaces of the hydraulic valve clearance compensator. Take them out with your fingers (pic. 15.5). Do not remove the hydraulic valve clearance adjuster unnecessarily as the O-rings can be easily damaged.
Pic. 15.6. Installing a hydraulic valve clearance compensator after filling the cavity in the rocker arm with clean engine oil
Fill the hydraulic valve clearance compensator cavity with clean engine oil and, carefully to avoid damaging the O-rings, insert the hydraulic compensator into the rocker arm (pic. 15.6).
Pic. 15.7. The correct position of the rocker arms
Assemble the rocker arms with the shafts so that the recesses at the ends of the shafts are directed towards the rear of the engine (intake valve shafts have twice as many oil passages as exhaust valve shafts) (pic. 15.7).
Pic. 15.8. Oil channel location (1) on the bearing cap No. 3 of the camshaft
After installing the camshaft, install the bearing caps with the arrows pointing towards the front of the engine. The oil passage on bearing cap #3 must be on the side shown in fig. 15.8.
Install the rocker arm assemblies, making sure that the rocker arm and spacer bushings are properly oriented and that there is no contact with the camshaft bearing caps.