Since 1921, Cloyes has been the trusted leader in automotive timing systems, delivering premium-quality solutions. An oil pump chain tensioner maintains appropriate tension on the oil pump chain. Depending on design and application, Cloyes engine oil pump chain tensioners can use spring tension or hydraulic pressure to properly tension the chain for optimal performance. To ensure total timing system integrity, Cloyes recommends replacing the chain along with the tensioners, guides, and sprockets during service. Trusted by professionals for over a century & backed by an industry-leading warranty and technical support.