Suzuki DF150 / DF175 service guide

Quick answers

How much oil does a Suzuki DF150 / DF175 take?

8.0 L (8.5/7.0 US/Imp. qt) oil change only; 8.5 L (9.0/7.5 US/Imp. qt) with filter change.

What engine oil does a Suzuki DF150 / DF175 use?

API SE, SF, SG, SH or SJ, or NMMA FC-W; SAE 10W-40 or NMMA FC-W 10W-40.

What gear oil does a Suzuki DF150 / DF175 use, and how much?

Suzuki Outboard Motor Gear Oil (SAE #90 hypoid gear oil). Quantity: 1100 ml (37.2/38.7 US/Imp. oz).

What spark plug does a Suzuki DF150 / DF175 use?

NGK BKR6E, qty 4. Gap: 0.7 to 0.8 mm (0.028 to 0.031 in).

How often should a Suzuki DF150 / DF175 be serviced?

The factory schedule lists: Initial 20 hours or 1 month; Every 50 hours or 3 months; Every 100 hours or 6 months; Every 200 hours or 12 months. 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 Suzuki DF150 / DF175?

The factory schedule says to replace it at 200 hours, and we follow that. In any case we never let it go longer than a year in Hawaiʻi's salt water.

What is the idle speed of a Suzuki DF150 / DF175?

650 ± 50 r/min, in gear about 650; procedure: 600 to 700 r/min in neutral, set 650 ± 50 with the by-pass air screw.

What is the propeller nut torque on a Suzuki DF150 / DF175?

55 N·m (5.5 kg-m, 40.0 lb-ft).

Maintenance specs

Engine oil	API SE, SF, SG, SH or SJ, or NMMA FC-W; SAE 10W-40 or NMMA FC-W 10W-40
Engine oil quantity	8.0 L (8.5/7.0 US/Imp. qt) oil change only; 8.5 L (9.0/7.5 US/Imp. qt) with filter change
Engine oil filter	14 N·m (1.4 kg-m, 10.0 lb-ft), 3/4 turn after the O-ring touches
Engine oil drain plug	13 N·m (1.3 kg-m, 9.5 lb-ft), new gasket
Gear oil	Suzuki Outboard Motor Gear Oil (SAE #90 hypoid gear oil)
Gear oil quantity	1100 ml (37.2/38.7 US/Imp. oz)
Gear oil drain and level plugs	10 N·m (1.0 kg-m, 7.2 lb-ft), new gaskets
Gearcase leak test	100 kPa (1.0 kg/cm², 14.2 psi), holding steady at least 5 minutes; start at 20 to 40 kPa (2.8 to 5.7 psi). Do not exceed 110 kPa (1.1 kg/cm², 15.6 psi)
Spark plug	NGK BKR6E, qty 4
Spark plug gap	0.7 to 0.8 mm (0.028 to 0.031 in)
Spark plug torque	28 N·m (2.8 kg-m, 20.0 lb-ft)
Idle speed	650 ± 50 r/min, in gear about 650; procedure: 600 to 700 r/min in neutral, set 650 ± 50 with the by-pass air screw
Thermostat operating temperature	58 to 62 °C (136 to 144 °F)
Anodes	Replace when 2/3 is gone; clean with a wire brush; never paint.
Propeller nut	55 N·m (5.5 kg-m, 40.0 lb-ft)
Power trim and tilt fluid	Dexron automatic transmission fluid or equivalent; check tilted full up. Manual release valve 3.5 N·m (0.36 kg-m, 2.6 lb-ft), do not overtighten
Tappet clearance, cold	IN 0.23 to 0.27 mm (0.009 to 0.011 in); EX 0.30 to 0.34 mm (0.012 to 0.013 in); shim type. Turn the crankshaft counterclockwise only. Camshaft housing bolts 12 N·m (1.2 kg-m, 8.7 lb-ft)

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.

1. Initial 20 hours or 1 month

   Replace: engine oil, oil filter, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin

2. Every 50 hours or 3 months

   Replace: gear case plug gaskets

   Check: fuel filter, anodes

3. Every 100 hours or 6 months

   Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin

   Check: fuel filter, anodes

4. Every 200 hours or 12 months

   Replace: engine oil, oil filter, oil drain plug gasket, spark plugs, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller

   Check: fuel filter, anodes

Source: Suzuki DF150/175 service manual. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.