Honda 14121-P13-000 Camshaft, Exhuast

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The camshaft turns in journals; the caps of the camshaft are incorporated in the cylinder head, and does not include bearings between the camshaft and the head. If one of the journals is damaged, it is necessary to change the head, and the reasons for the failure must be determined. First, record the radio security code and the stations tuned in by putting the broadcast channel and the presets in writing then remove the negative terminal of the battery. The spark plug wires should be disconnected, the valve cover and timing belt should also be removed. The rocker arm lock nuts and adjusting screws are to be loosened and thereafter camshaft bearing caps or holder plates are to be removed and camshafts are to be taken out carefully. Pull of the rocker arms and record their positions and wear and tear if any. During installation ensure that new O-rings, seals and gaskets are used. It is recommended that the camshaft bearing caps are cleaned and inspected before the camshaft is lubricated on the lobes and journals before the camshaft bearing caps are installed and fastened to 86 inch lbs. in sequence. The camshafts should be set for the top dead centre of the No. 1 piston and the holes should be aligned and a 5mm pin punch inserted. Insert the keys into the camshaft keyways, fit the pulleys and again tighten the retain bolts to 27 ft. lbs. Bolt the timing belt in place while setting the valve clearance; torque the valve cover nuts to 86 inch lbs. Tap the spark plug wires if any and reconnect the negative terminal of the battery, afterwards, enter the radio security code. For inspection, usually the camshaft needs to be cleaned by degreasing the camshaft, the oil holes must be cleaned, the cam lobes and the bearing journals have to be inspected for excessive wear. Any questionable lobe will require checking all the lobes; if the journal is worn or the lobe, then the camshaft has to be replaced. If the lobes and journals on the camshaft and journals on the camshaft lobes look good, the straightness should be checked with V-blocks and dial indicator, reinstalling the camshaft if it deviates more than 0.001 in. Camshaft lobe lift should then be measured with a micrometer and if the exhaust and intake lobes do not measure the same then the camshaft will have to be reground or changed.