Tohatsu MFS60A (3 cylinder EFI four-stroke) service guide

Quick answers

How much oil does a Tohatsu MFS60A take?

2.4 L (2.5 US qt) with filter; 2.2 L (2.3 US qt) without filter.

What engine oil does a Tohatsu MFS60A use?

4 stroke engine oil, API SH, SJ or SL, SAE 10W-30 or 10W-40.

What gear oil does a Tohatsu MFS60A use, and how much?

Hypoid gear oil, API GL-5, SAE #80-90. Quantity: 500 cm³ (0.53 US qt); fill through the lower plug hole.

What spark plug does a Tohatsu MFS60A use?

NGK IKR6G8. Gap: 0.7 to 0.8 mm (0.028 to 0.032 in); limit 1.0 mm (0.039 in).

How often should a Tohatsu MFS60A be serviced?

The factory schedule lists: First 20 hours or 1 month; Every 50 hours or 3 months; Every 100 hours or 6 months; Every 200 hours or 1 year. 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 Tohatsu MFS60A?

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 Tohatsu MFS60A?

850 ± 30 r/min after warm-up.

What is the propeller nut torque on a Tohatsu MFS60A?

35 N·m (26 lb·ft) [3.5 kgf·m].

Maintenance specs

Engine oil	4 stroke engine oil, API SH, SJ or SL, SAE 10W-30 or 10W-40
Engine oil quantity	2.4 L (2.5 US qt) with filter; 2.2 L (2.3 US qt) without filter
Oil filter	18 N·m (13 lb·ft) [1.8 kgf·m]; Oil filter bolt M20 x 1.5: 30 N·m (22 lb·ft)
Engine oil drain bolt (M14 x 1.5)	24 N·m (18 lb·ft) [2.4 kgf·m]
Gear oil	Hypoid gear oil, API GL-5, SAE #80-90
Gear oil quantity	500 cm³ (0.53 US qt); fill through the lower plug hole
Gear case leak test	0.069 MPa (10 psi) [0.7 kgf/cm²] held 10 seconds
Spark plug	NGK IKR6G8
Spark plug gap	0.7 to 0.8 mm (0.028 to 0.032 in); limit 1.0 mm (0.039 in)
Spark plug torque	18 N·m (13 lb·ft) [1.8 kgf·m]
Idle speed	850 ± 30 r/min after warm-up.
Thermostat	Starts to open 60 °C ± 1.5 °C (140 ± 3 °F); fully open 75 °C (167 °F); lift 3.0 mm (0.12 in) or more
Cooling water pressure (reference)	1500 r/min 13.6 kPa (1.9 psi); 3000 r/min 27.3 kPa (3.9 psi); 5000 r/min 41.3 kPa (6 psi)
Anodes	Engine anode screw M5: 2 N·m (1.4 lb·ft); anode plug M16: 18 N·m (13 lb·ft)
Propeller nut (M16 x 1.5)	35 N·m (26 lb·ft) [3.5 kgf·m]
Power trim and tilt fluid	ATF DEXRON III, capacity 325 cm³ (11.0 fl oz).
Valve clearance, cold	IN 0.20 to 0.25 mm (0.008 to 0.010 in); EX 0.30 to 0.35 mm (0.012 to 0.014 in); lock nut 7 N·m (5 lb·ft) [0.7 kgf·m]
Timing belt	Check appearance for wear, damage, elongation.

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. First 20 hours or 1 month

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

   Check: spark plugs, fuel filter

2. Every 50 hours or 3 months

   Replace: gear case plug gaskets, propeller cotter pin

   Check: fuel filter, gear case oil, water pump impeller

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: spark plugs, fuel filter, water pump impeller, thermostat, anodes

4. Every 200 hours or 1 year

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

   Check: spark plugs, fuel filter, thermostat, anodes

Source: Tohatsu 4 Stroke MFS60A service manual supplement; Tohatsu 4 Stroke MFS40A/50A service manual, OB No. 003-21067-0. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.