2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 23Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 23

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MAINTENANCE
1 Check oil pump2 Checkreplace timing chain tensioner3 Check and adjust valve clearance, if necessary
Every 1000 Hours or Years
1 Replace timing belt2 Replace timing chai