Home Auto Repair 1991 Mercedes Benz 300E Camshaft: Service and Repair Removing and Installing Camshafts

1991 Mercedes Benz 300E Camshaft: Service and Repair Removing and Installing Camshafts

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Download CAUTION: If the camshaft is renewed, the rocker arms must also be renewed. Inductively hardened camshafts must only be used with hard chrome-plated rocker arms (standard up to February 1989). Chilled cast camshafts may only be used with rocker arms with carbide metal coating (standard as from March 1989). If bearing fretting or severe scoring exists, the camshaft bearings can be drilled open by 0.5 mm (0.020 in) in the cylinder head or in the rocker arm bearing brackets and a camshaft with oversized bearing journals installed. After damage to a cam (e. g. worn cams), all the affected timing parts (hydraulic elements, valves, valve springs, valve plates and valve wedges) should be checked for signs of damage. If individual rocker arm bearing brackets are renewed, all the bearing brackets must be tightened to specification and the camshaft checked to ensure that it moves freely. REMOVAL Setting TDC 1. Set piston of No. 1 cylinder to TDC (arrow). 2. Remove front cover at the top, See: Timing Components/Timing Cover/Service and Repair 3. Remove chain tensioner, See: