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Mercury FourStroke 8 / 9.9

  • 2 cyl
  • 209.8 cm³
  • 8–9.9 hp
  • Petrol

Engine data

Specifications for Mercury FourStroke 8 / 9.9
Power8–9.9 hp
Cylinders2
Displacement209.8 cm³
FuelPetrol
TypeOutboard

Autumn and spring plan for Mercury FourStroke 8 / 9.9

Here's what to do when hauling out and launching. Always follow the instruction book for your engine.

Autumn

  • Change the engine oilEvery 100 hours or before winter storage. · every 100 hours
  • Change gear oilEvery 100 hours or before winter storage. · every 100 hours
  • Lubricate the engine's grease pointsevery 100 hours
  • Check the anodesevery 100 hours
  • Replace the fuel filter on the suction side300-hour service kit (fuel filter, spark plugs, seals, water pump kit) 8M0181316 · Performed by a Mercury workshop. · every 100 hoursBuy: Marinshopen
  • Flush the engine with fresh water
  • Lubricate according to the lubrication schedule
  • Store the engine upright so that water drains out

Spring

  • Check the timing beltPerformed by a Mercury workshop. · every 300 hours or every 36 months
  • Replace the impellerPerformed by a Mercury workshop. · every 300 hours or every 36 months
  • Check the gearcase oilMilky oil means there is water in the gear housing.
  • Check the propeller and anodes
  • Check that cooling water comes out of the tell-tale hole
Add to calendarTick off in the service bookTwo reminders a year: in April and in October.

Email me the plan

Troubleshooting

Starting problems

Runs rough, stalls or loses power

Smoke and exhaust

Oil, water and fuel

Electrics, alarms and fault codes

Drive, gearbox and trim

Outboard

Manuals

Spare parts

Spare parts for Mercury FourStroke 8 / 9.9
PartPart numberNoteSource
Service kit 300 h (water pump kit etc.)8M01208371 pcsBuy (1)8/9.9 hp standard gearcase, serial no. 0R042475 and aboveMercruiserParts.com: Mercury 100/300-hour service kits (www.mercruiserparts.com)
Service kit 300 h (water pump kit etc.)8M01208671 pcsBuy (1)8/9.9 hp BF/CT gearcase, serial no. 0R042475 and aboveMercruiserParts.com: Mercury 100/300-hour service kits (www.mercruiserparts.com)
300-hour service kit (fuel filter, spark plugs, seals, water pump kit)8M01813161 pcsBuy (1)8–9 hp, serial no. 0R042475 and above (Quicksilver)MercruiserParts.com: Mercury 100/300-hour service kits (www.mercruiserparts.com)

Listings for Mercury FourStroke 8 / 9.9

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Related models

Mercury FourStroke 2.5 / 3.5

Outboard

1 cyl · 85.5 cm³ · 2.5–3.5 hp · Petrol

Mercury FourStroke 4 / 5 / 6

Outboard

1 cyl · 123 cm³ · 4–6 hp · Petrol

Mercury FourStroke 6 EFI

Outboard

2 cyl · 209.8 cm³ · 6 hp · Petrol

Mercury FourStroke 15 / 20

Outboard

15–20 hp · Petrol

Service guides

Replacing the impeller →Winterize a boat engine →

Frequently asked questions about Mercury FourStroke 8 / 9.9

Where can I find the owner's manual for Mercury FourStroke 8 / 9.9?

Links to owner's manuals and workshop manuals are available under Manuals.

How many cylinders does Mercury FourStroke 8 / 9.9 have?

Mercury FourStroke 8 / 9.9 has 2 cylinders.

What fuel does the Mercury FourStroke 8 / 9.9 use?

Mercury FourStroke 8 / 9.9 runs on petrol.

Sources

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