Yamaha F350 / LF350 (V8 5.3 L) service guide
Oil, gear oil, spark plugs and the service schedule for the Yamaha F350 / LF350 (V8 5.3 L) (350 hp, four-stroke), from the factory service manual, plus how we service it in Hawaiʻi.
Models covered: F350TR and LF350TR four-stroke V8, DOHC, 5,330 cm³ (325.2 cu in), fuel injected, Digital Electronic Control. F350TR model code 6AW from serial 1000001; LF350TR model code 6AX from serial 1000001. X = 25 in, U = 30 in transom. Premium unleaded, minimum 89 PON.
Quick answers
- How much oil does a Yamaha F350 / LF350 take?
- 7.8 L (8.24 US qt, 6.86 Imp qt) without filter; 8.0 L (8.45 US qt, 7.04 Imp qt) with filter.
- What engine oil does a Yamaha F350 / LF350 use?
- YAMALUBE 4-M FC-W or 4-stroke motor oil, API SE, SF, SG, SH, SJ or SL, SAE 5W-30, 10W-30, 10W-40 or 20W-40.
- What gear oil does a Yamaha F350 / LF350 use, and how much?
- Hypoid gear oil, API GL-5, SAE 90 or 80W-90 (Yamaha Marine Gearlube HD). Quantity: F350: 1,520 cm³ (51.4 US oz, 53.5 Imp oz); LF350: 1,310 cm³ (44.3 US oz, 46.1 Imp oz).
- What spark plug does a Yamaha F350 / LF350 use?
- NGK LFR6A-11, qty 8. Gap: 1.0 to 1.1 mm (0.039 to 0.043 in).
- How often should a Yamaha F350 / LF350 be serviced?
- The factory schedule lists: Initial 20 hours and every 100 hours; Every 100 hours; Every 300 hours; Every 500 hours; Every 1,000 hours. In Hawaiʻi's salt water we do a full yearly service every 200 hours or 1 year, whichever comes first, and a new engine needs its first (break-in) service.
- When should the water pump impeller be replaced on a Yamaha F350 / LF350?
- The factory schedule says to replace it at 300 hours. In Hawaiʻi's warm salt water we replace it every 200 hours or 1 year, whichever comes first, because a worn impeller is the most common cause of overheating.
- What is the idle speed of a Yamaha F350 / LF350?
- 600 to 700 r/min.
- What is the propeller nut torque on a Yamaha F350 / LF350?
- 54 N·m (5.4 kgf·m, 39.8 ft·lb).
Maintenance specs
| Engine oil | YAMALUBE 4-M FC-W or 4-stroke motor oil, API SE, SF, SG, SH, SJ or SL, SAE 5W-30, 10W-30, 10W-40 or 20W-40 |
|---|---|
| Engine oil quantity | 7.8 L (8.24 US qt, 6.86 Imp qt) without filter; 8.0 L (8.45 US qt, 7.04 Imp qt) with filter |
| Oil filter | 18 N·m (1.8 kgf·m, 13.3 ft·lb) with a 72.5 mm (2.9 in) filter wrench; do not damage the oil pressure sensor or its lead |
| Engine oil drain bolt (M14) | 27 N·m (2.7 kgf·m, 19.9 ft·lb) |
| Gear oil | Hypoid gear oil, API GL-5, SAE 90 or 80W-90 (Yamaha Marine Gearlube HD) |
| Gear oil quantity | F350: 1,520 cm³ (51.4 US oz, 53.5 Imp oz); LF350: 1,310 cm³ (44.3 US oz, 46.1 Imp oz) |
| Gear oil drain and check screws | 9 N·m (0.9 kgf·m, 6.6 ft·lb), new gaskets |
| Lower unit holding pressure | 68.6 kPa (0.7 kgf/cm², 9.9 psi) for at least 10 seconds |
| Spark plug | NGK LFR6A-11, qty 8 |
| Spark plug gap | 1.0 to 1.1 mm (0.039 to 0.043 in) |
| Spark plug torque | 28 N·m (2.8 kgf·m, 20.7 ft·lb); ignition coil bolt 9 N·m (0.9 kgf·m, 6.6 ft·lb) |
| Idle speed | 600 to 700 r/min |
| Thermostats (port and starboard) | Opens 58 to 62 °C (136 to 144 °F); fully open 70 °C (158 °F); lift over 5.0 mm (0.20 in) |
| Anode bolts | Lower unit anode bolt M10: 42 N·m (4.2 kgf·m, 31.0 ft·lb); thermostat cover anode bolt M5: 7 N·m (0.7 kgf·m, 5.2 ft·lb); Rectifier Regulator anode screw M4: 3 N·m (0.3 kgf·m, 2.2 ft·lb); anode plug M22: 24 N·m (2.4 kgf·m, 17.7 ft·lb) |
| Propeller nut | 54 N·m (5.4 kgf·m, 39.8 ft·lb) |
| Power trim and tilt fluid | ATF Dexron; reservoir plug 2 N·m (0.2 kgf·m, 1.5 ft·lb), new O-ring |
| Valve clearance, cold | IN 0.20 ± 0.03 mm (0.008 ± 0.001 in); EX 0.34 ± 0.03 mm (0.013 ± 0.001 in) |
Service schedule
The factory maintenance intervals, with what is replaced and what is checked at each. Rows marked Hawaiʻi are our shop's yearly service for salt water use.
Initial 20 hours and every 100 hours
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin
Check: fuel filter
Every 100 hours
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin
Check: spark plugs, fuel filter, water pump impeller, thermostat, anodes
Every 200 hours or 1 year (our Hawai‘i yearly service) Hawai‘i
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller
Check: spark plugs, fuel filter, thermostat, anodes
Every 300 hours
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller
Check: spark plugs, fuel filter, thermostat, anodes
Every 500 hours
Replace: engine oil, oil drain plug gasket, fuel filter, gear case oil, gear case plug gaskets, propeller cotter pin, anodes, water pump impeller
Check: spark plugs, thermostat
Every 1,000 hours
Replace: engine oil, oil drain plug gasket, fuel filter, gear case oil, gear case plug gaskets, propeller cotter pin, anodes, water pump impeller
Check: spark plugs, thermostat
We replace the water pump impeller at every service from 200 hours up, which can be sooner than the factory schedule, because of Hawaiʻi’s warm salt water.
Source: Yamaha F350 / LF350 service manual, LIT-18616-03-02. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.