Rocker Arm Assembly Components (VTEC Models)
A - Fifth camshaft holder; B - Exhaust valve drive rocker arm (B); C - Spring of the exhaust valve rocker shaft; D - Secondary intake valve drive rocker arm; E - Intermediate rocker arm for exhaust valves; F - Pistons; G - Primary intake valve actuator rocker arm; H - Distribution plate; I - Exhaust valve assembly spring; J - First camshaft holder
Removal
1. Remove the cylinder head cover (see Section Removal and installation the cylinder head cover).
2. Bring the piston of the first cylinder to the TDC position (see Section Bringing the piston of the first cylinder to the top dead center (TDC) position), remove the timing belt (see Section Removal, condition check and installation of the timing belt and timing drive gears).
3. Loosen the camshaft bearing cap bolts by 1/4 turn (to reduce the force developed by the valve springs) - proceed in the reverse order to that shown in the illustration.
4. Remove the rocker arm and axle assembly from the cylinder head. The camshaft bearing cap bolts will prevent the assembly from falling apart.
Examination
1. Once the rocker arm assembly is removed, it is a good idea to disassemble it to examine the components in more detail. Remove the mounting bolts and remove the rocker arm axles, springs, and bearing caps from the axles. It is a good idea to mark the position of the axles relative to the bearing caps beforehand.
Caution! On engines equipped with the VTEC system, it is wise to secure the primary and secondary intake valve rocker arms with rubber bandages. Try to stack the removed components in the order they were installed, since they must be seated strictly in their original places during assembly.
2. Clean the components thoroughly and inspect them for signs of wear and damage. Assess the condition of the rocker arm surfaces that contact the camshaft. Check the rocker arm seating surfaces on the axles for scoring and signs of excessive wear, as well as the walls of the rocker arm mounting holes themselves. Replace any defective components. Also make sure that the oil flow inside the axles is clear.
Note: On VTEC models, the rocker arms are equipped with roller tips. Check the wear and freedom of rotation of the rollers.
3. On VTEC equipped engines, remove the valve clearance adjusters from their seats in the cylinder head and clean them thoroughly. Use your fingers to check the free movement of the plungers.
Installation
1. Lubricate all components with clean engine oil and install them in their original locations on the rocker arm shafts.
Note: Pay attention to the markings that distinguish left-hand components from right-hand components.
2. Lubricate the cams and journals of the camshaft with a special installation grease. Apply a thin layer of anaerobic sealant to the mating surfaces of the first and sixth camshaft bearing caps with the cylinder head, then install the rocker arm assembly in its regular place.
3. In a strictly defined order, tighten the camshaft cover bolts in several steps with the required force.
4. Installation of the remaining components is carried out in the reverse order of their dismantling.
5. Finally, do not forget to adjust the valve clearances (if necessary) (see Chapter Settings and ongoing maintenance).
6. Start the engine and check it for signs of oil leaks and proper operation.
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