Maintenance Data - TOHATSU MD 70-90C2 Service Manual

Service Data

4. Maintenance Data

escription
Cylinder Head
Cylinder
Piston
Piston Rings
Piston Pin
Crank Shaft
Connecting Rod
Reed Valve Stopper
Reed Valve
Engine Block
2-8
Item
uild up of carbon in combustion chamber
Distortion or damage on mating surface
Corrosion
Cooling water passage clogged
Mating surface scratches and wear
Seizure, cylinder liner damage, or wear
Deposits in water jacket
Engine anode
Diameter
<Measure the external diameter at a point 11.5mm
(0.45 in) above the lower edge of the piston skirt.>
Piston clearance
<The gap between cylinder and piston.>
Carbon build up on piston crown and in ring grooves
Scratch on the sliding surface
Measure clearance between piston ring and ring groove.
Measure piston pin hole diameter
Clearance between piston pin and pin hole
Ring end gap
Note: Measurement of ring end gap ; If ring
gauge is not available, use cylinder bore top or
bottom with small wear.
Outer diameter
Deflection
<Measure with both ends supported.>
earing external diameter
Oil seal scratches
Loose rod
Small end inner diameter
Small end area side gap
Lift height
Fails to close, is worn or damaged
Compression
Note: Remove all spark plugs and measure
after warming with the throttle fully open and safety
lanyard removed.
Standard Values
0.03 mm (0.0012in) or less for scratches
0.03 mm (0.0012in) or less for distortion
0.03 mm (0.0012in) or less for scratches
0.03 mm (0.0012in) or less for distortion
¿86.00 Ð 86.02 mm <0.5 oversaize : ¿86.5 mm>
¿3.3858 Ð 3.3866in <0.0197 in oversaize : ¿3.4055 in>
¿85.85 mm <0.5 oversize : ¿86.35 mm>
*Value with piston coating
0.13 Ð 0.20 mm (0.0051 Ð 0.0079 in)
*Value with piston coating
Top : 0.04 Ð 0.08 mm (0.0016 Ð 0.0032
Second : 0.04 Ð 0.08 mm (0.0016 Ð 0.0032
Second : 0.04 Ð 0.08 mm (0.0016 Ð 0.0032
¿23.00 mm (¿0.9055 in)
0.015 Ð 0.025 mm (0.00059 Ð 0.00098 in)
Top : 0.25 Ð 0.40 mm (0.0098 Ð 0.0157
Second : 0.25 Ð 0.40 mm (0.0098 Ð
Third : 0.25 Ð 0.40 mm (0.0098 Ð 0.0157
¿23.00 mm (0.9056 in)
0.05 mm (0.0020 in) or less
Upper area of #1: ¿36.0 mm (1.4173 in)
#1 Ð 2, #2 Ð 3 : ¿35.0 mm (1.3780 in)
Lower area of #3 : ¿40.0 mm (1.574 in)
¿28.00 mm (1.102 in)
0.20 Ð 0.55 mm (0.0079 Ð 0.0217 in)
9.2 Ð 9.4 mm (0.362 Ð 0.370 in)
0.9 MPa (128 psi) [9.2 kgf/cm ]
2
in)
in)
in)
in)
0.0157 in)
in)
TLDI 75/90C2 2010