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Check rotor and oil pump cases for excessive wear or damage.
If any malcondition is found, replace oil pump assembly.
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Check teeth of oil pump drive sprocket for wear or damage.
If any malcondition is found, replace oil pump drive sprocket.
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Check teeth of oil pump sprocket for wear or damage.
If any malcondition is found, replace oil pump assembly.
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Check oil pump chain for wear or damage.
If any malcondition is found, replace oil pump chain.