TOHATSU MFS 60A User Manual

2-6
Service Data
4st 60 2019
2. Maintenance Data
Parts Name Item Standard Value
Engine Parts
Cylinder Head
Build up of carbon in combustion chamber
Measure the cam journal clearance 42.000 to 42.025 mm (1.65354 to 1.65453 in)
Distortion or damage on mating surface Distortion Amount : 0.05 mm (0.0020 in) or less
Corrosion on the mating surface
Cooling water passage clogged
Cylinder
Deposition in water jacket
Wear of bore : Use cylinder gauge to 70.00 mm (2.7559 in)
measure inner diameter.
Seizure, cylinder liner damage, or wear
Taper
Out-of-roundness
Distortion or damage on cylinder Distortion Amount : 0.05 mm (0.0020 in) or less
head mating surface
Engine Anode
Piston Outer Diameter 69.97 mm (2.7547 in)
Measure outer diameter at 12 mm (0.47 in)
above lower end of piston skirt
(at right angle to piston pin).
Piston Clearance 0.020 to 0.055 mm (0.00079 to 0.00217 in)
Carbon build up on piston crown
and in ring grooves
Scratch on the sliding surface
Measure side clearance between
Top Ring : 0.04 to 0.08 mm (0.0016 to 0.0031 in)
piston ring and ring groove.
Second Ring : 0.01 to 0.05 mm (0.0004 to 0.0020 in)
Oil Ring : 0.03 to 0.13 mm (0.0012 to 0.0051 in)
Measure piston pin hole diameter. 17.005 mm (0.66949 in)
Clearance between piston pin and pin hole 0.002 to 0.012 mm (0.00008 to 0.00047 in)
Piston Pin Outer Diameter 17.000 mm (0.66929 in)
Piston Ring Ring End
Note : Measurement of ring
end gap : If ring gauge
is not available, use
cylinder bore top or
bottom with small wear.
Ring Gage 70.000 mm (2.75591 in)
Gap
Top Ring Top Ring : 0.20 to 0.35 mm (0.0079 to 0.0138 in)
Second Ring Second Ring : 0.35 to 0.50 mm (0.0138 to 0.0197 in)
Oil Ring Oil Ring : 0.20 to 0.70 mm (0.0079 to 0.0276 in)
Connecting Rod
Small End Inner Diameter 17.012 mm (0.66976 in)
Big End Oil Clearance 0.020 to 0.045 mm (0.00079 to 0.00177 in)
Big End Side Clearance 0.10 to 0.20 mm (0.0039 to 0.0079 in)
Crankshaft
Crankshaft runout : Use V blocks to
support crankshaft at journals of
both ends.
Less than 0.05 mm (0.0020 in) at both ends and at the center.
Crank pin outer diameter 37.99 mm (1.4957 in)
Main journal outer diameter 39.99 mm (1.5744 in)
Metal bearing oil clearance 0.020 to 0.041 mm (0.0008 to 0.0016 in)
Crankshaft side clearance 0.05 to 0.15 mm (0.0020 to 0.0059 in)

TOHATSU MFS 60A Specifications

General

Brand	TOHATSU
Model	MFS 60A
Category	Outboard Motor
Language	English