MerCruiser Scorpion 350 User Manual (English)

Questions and Answers:

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Adam EdwardsAug 14, 2025
Why my MerCruiser Engine not start or is hard to start?
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  omoranAug 14, 2025
  If your MerCruiser engine is not starting or is hard to start, consider the following: * Check the lanyard stop switch to ensure it is properly positioned. * Review and follow the correct starting procedure. * Ensure there is an adequate fuel supply by filling the fuel tank or opening the valve. * Replace the fuel filter if it's clogged. * Drain and refill the fuel tank with fresh fuel if the current fuel is stale or contaminated. * Inspect fuel lines and the tank vent line for kinks or clogs; replace kinked lines or clear obstructions with compressed air. * Check all wire connections for faults. * Have the EFI system checked by an authorized Mercury MerCruiser dealer.
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schmittmarkAug 17, 2025
How to fix MerCruiser Engine that runs rough, misses, or backfires?
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  Scott GrimesAug 17, 2025
  If your MerCruiser engine runs rough, misses, or backfires, here are a few things to check: * Replace the fuel filter. * If the fuel is stale or contaminated, drain the tank and fill it with fresh fuel. * Inspect fuel lines and the fuel tank vent line for kinks or clogs. Replace any kinked lines or clear obstructions with compressed air. * Clean the flame arrestor. * Have the EFI system checked by an authorized Mercury MerCruiser dealer.
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carlasmithAug 21, 2025
What to do if MerCruiser Engine has poor performance?
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  Richard SimsAug 21, 2025
  If your MerCruiser engine has poor performance, check these items: * Inspect the throttle cable and linkages for proper operation to ensure the throttle is fully open. * Replace the propeller if it's damaged or improper. * Drain any excessive bilge water and check for the cause of entry. * Reduce the load or redistribute it more evenly if the boat is overloaded or improperly loaded. * Clean the flame arrestor. * Clean or repair the boat bottom if it's fouled or damaged.
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Jennifer FrederickAug 25, 2025
Why MerCruiser Scorpion 350 Engine has low engine oil pressure?
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  Marilyn CooperAug 25, 2025
  To address low engine oil pressure in your MerCruiser engine, take these steps: * Check the oil level in the crankcase and add oil if it's insufficient. * If there's excessive oil in the crankcase, remove the required amount and check for the cause of the excess, such as improper filling. * Change the oil and oil filter, using the correct grade and viscosity oil, if the current oil is diluted or of improper viscosity. Determine the cause of the dilution, such as excessive idling.
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Tara GravesAug 27, 2025
What to do if MerCruiser Engine starter motor won't crank or cranks slowly?
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  davisbrendaAug 27, 2025
  If the starter motor won't crank the engine or cranks slowly, here's what to check: * Ensure the battery switch is turned on. * Make sure the remote control is in the neutral position. * Inspect and reset the main power circuit breaker or replace the fuse. Also, check the 5 amp fuse on the power harness connected to the battery and replace it if needed. * Examine all electrical connections and wires, especially the battery cables. Clean and tighten any loose connections. * Test the battery and charge it if necessary, or replace it if it's bad. * Verify the lanyard stop switch is properly positioned.
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Tiffany CarterAug 30, 2025
How to fix MerCruiser Scorpion 350 Engine battery that will not recharge?
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  John CampbellAug 31, 2025
  If the battery isn't recharging on your MerCruiser, try these steps: * Turn off any non-essential accessories to reduce the current draw from the battery. * Replace or adjust the alternator drive belt if it's loose or in poor condition. * Test the battery and replace it if necessary. * Inspect all electrical connections and wires, paying special attention to the battery cables. Clean and tighten any faulty connections, and repair or replace any damaged wiring. * Test the alternator output and replace it if necessary.
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Katelyn MontgomerySep 3, 2025
How to troubleshoot MerCruiser Engine remote control that is difficult to move?
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  Cheyenne NealSep 3, 2025
  To address issues with the remote control on your MerCruiser, which may be difficult to move, have excessive play, or make unusual sounds: * Lubricate the shift and throttle linkage fasteners. * Remove any obstructions in the shift or throttle linkages. * Straighten any kinked shift or throttle cables, or have an authorized Mercury MerCruiser dealer replace the cable if it's damaged beyond repair.
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Steven StewartSep 6, 2025
Why MerCruiser Scorpion 350 Engine steering wheel jerks or is difficult to turn?
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  Glenn SmithSep 6, 2025
  To address steering wheel issues on your MerCruiser, where it jerks or is difficult to turn: * Check the power steering pump fluid level for leaks and refill the system with fluid. * Replace or adjust the drive belt if it's loose or in poor condition. * Lubricate the steering components.
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Christopher KeySep 9, 2025
What to do if MerCruiser Scorpion 350 has high temperature?
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  jenningschristopherSep 9, 2025
  If your MerCruiser engine is overheating, make sure the water inlet or seacock is open and replace or adjust the drive belt.