Removal
1. Remove the cylinder head covers (see Section Removal and installation cylinder head covers), timing belt and gears (see Section Removal, condition check and installation of the timing belt and timing drive gears).
2. Remove the ignition distributor (see Chapter Engine electrical equipment).
3. Remove the rocker arm assemblies (see Section Removal, condition check and installation of rocker arm assembly).
4. Remove the EGR valve (see Chapter Engine management) in order to provide access to the rear camshaft mounting plate.
Note: Before removing the camshafts, measure their end play.
5. Remove the rear camshaft retainer plate.
6. Carefully remove the camshaft from the cylinder head, being careful not to damage its cams and journals.
Examination
1. Remembering the order of installation of individual parts, dismantle the rocker arm assembly, then bolt the axles freed from components to their regular places in the cylinder head. Tighten the fasteners with the required force.
2. Secure the dial gauge so that its plunger rests against the end of the camshaft. Pull the shaft back as far as it will go (wrap the end of the lever with tape to avoid damaging the working surfaces of the shaft), zero the gauge, then move the shaft as far as it will go in the opposite direction. Read the gauge readings, record the result and compare it with the standard requirements for axial clearance of camshafts (see Specifications). If the reading taken is outside the permissible range, the shaft must be replaced.
3. After checking the axial clearance, remove the rocker shafts, then remove the shaft from the cylinder head. Measure the journal diameters and cam lobe heights. Compare the measurement results with the requirements Specifications (for V6 engines) Visually assess the degree of wear on the shafts - look for things like scratches, scoring, cavities and signs of overheating.
Note: Note the difference in cam lobe placement on the front and rear camshafts.
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Installation
1. Remove the rear timing belt covers from both cylinder heads to gain access to the camshaft seals.
2. The seals must be replaced each time the head is disassembled/the shafts are removed. Old seals are removed by prying them up with a special tool or a flat-bladed screwdriver.
3. Lubricate the lips of the new seal with clean engine oil, then seat it perpendicularly in its seat to the same depth as the old seal. As a mandrel for seating the seal, you can use a socket head of the appropriate size, or a section of pipe of the appropriate diameter.
4. Carefully wipe the camshaft, its bearing beds in the cylinder head and covers, and the rocker arms of the valve drive with a rag soaked in acetone. Try to completely remove the slightest traces of sludge and dirt. Use only a clean, lint-free rag to wipe the components. Lubricate the journals and cams of the shaft with a special assembly grease and carefully install the shaft in its regular place in its head.
5. Lubricate and install a new sealing ring on the shaft holder plate. Bolt the plate into its original place on the cylinder head.
6. Proceeding in a similar manner (see paragraphs 4 and 5), install the second camshaft into your cylinder head.
7. Reinstall all remaining components in the reverse order of removal. Check the valve clearances and adjust them if necessary (see Chapter Settings and ongoing maintenance).
8. Start the engine and check for oil leaks through the camshaft seals. Let the engine run for about five minutes at low speed to remove air from the valve clearance adjuster assemblies. Make sure that the unit functions properly.
Note: During the first five minutes after initial start-up, the valve mechanism will operate with increased noise. If the noise level does not decrease, this may indicate a defect in one of the valve clearance adjusters.
The article was taken from the website hondabook.ru