Maintenance Data - TOHATSU MFS 60A Service Manual

Service Data

2. Maintenance Data

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