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Replacing Valve Guide Seals

Model: BMW Serie 3 E46 - Years 1998-2006
Part: Engine

Before proceeding with the replacement of the valve guide seals, ensure the surfaces are perfectly flat using a straight edge and a valve feeler gauge. Once verified, compress the valve return spring with a spring clamp and remove the valve itself to proceed with the seal replacement (lubricate both the seal and the valve with clean oil).
Also, check the surface of the cylinder base, re-tap the threads of the head bolt holes without contaminating the cylinders with debris; check the relative position of the pistons concerning the base and proceed with the installation of the new gasket and the cylinder head, tightening the bolts in a cross pattern with a torque wrench. Insert the new rocker arm support pins and then the new camshaft, aligning the timing marks. Proceed to install the turbocharger, replacing gaskets and the oil seal, and complete with the installation of the valve cover and the intake manifold, inserting the new gaskets.

Updated on 12 February 2026 by ScegliAuto

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