Unscrew the four nozzles and protect them from possible damage.
Fix the head of the block in a vice with a bracket screwed to the exhaust manifold mounting studs.
Remove the camshaft.
The device for removing and installing valves is shown in fig. 184. If you have it, install it on the head of the block. Its tip must touch the inner recess of the valve spring plate, otherwise the spring will not compress. Using the tool, compress the spring enough to remove the lock cotters (forceps with sharp long ends), after which the valves can be removed.
If you do not have a fixture, then the valve mount can also be released using a piece of pipe that is put on the upper spring plate. In this case, it is necessary to support the valve from below. Hit the pipe with a hammer to force the crackers out of the valve stem groove. Rusks will remain inside the tube. Spring plates are removed using two screwdrivers. A rag should be placed in the combustion chamber of the head so that it does not allow the valves to fall out. Remove springs and valves.
Remove the oil seals. To remove them, it is best to use a special tool (pic. 185). If you use anything else, the caps must be replaced.
Remove the lower spring plate from the hole using special pliers or circlip pliers. On fig. 186 shows the design of the cylinder head of the engine produced before 1986 (without hydraulic valve clearance compensators).
Pic. 186. Components of the cylinder head: 1 - camshaft bearing caps; 2 - cover nut (20 Nm); 3 - bolt (45 Nm); 4 - internal valve spring; 6 - oil scraper cap; 7 - bushing; 8 - camshaft seal; 9 - cylinder head; 10 - valves; 12 - pusher; 13 - adjusting washer; 14 - camshaft
Visitor comments