Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 103Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 103

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SERVICE MANUAL NUMBER 24
Miscellaneous
Noise Possible Causes Advanced timing Low octane fuel Engine spark knock Engine running hot Carbon deposits in engine Wrong ignition timing Carbureto