BMW Rigid Chain Tensioner Rigid chain tensioner necessary to tension the primary timing chain on N40, N42, N45, N46, N52 and N46 BMW engines when setting valve, cam or VANOS timing. Rigid chain tensioner necessary to tension the primary timing chain on N40, N42, N45, N46, N52 and N46 BMW engines when setting valve, cam or VANOS timing.
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