Maintenance Data - TOHATSU MX 50D2 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
Carburetor
2-12
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
Diameter
<Measure the external diameter at a point 11.5 mm
(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.>
Deflection
Gap between the connecting rod thrust washer and
the crank web.
Lift height
Fails to close, is worn or damaged
Compression
Note : Remove all three spark plugs and measure
after warming with the throttle fully open.
Remove air injector and fuel injector connectors.
Setting mark
Venturi bore
Main jet (MJ)
Main air jet (MAJ)
Main nozzle bore (MN)
Slow jet (SJ)
Slow air jet (SAJ)
Throttle opening (at WOT)
Pilot screw (PS)
Float height
Idling speed
Troling speed
Standard Values
0.03 mm/0.0012 in or less for scratches
0.03 mm/0.0012 in or less for distortion
0.03 mm (0.0012 in) or less for scratches
0.03 mm (0.0012 in) or less for distortion
¿68.00 mm/2.677 in
¿67.96 mm/2.676 in <0.5 oversize : 68.46 mm/2.695 in>
0.08 Ð 0.12 mm/0.00315 in Ð 0.004724 in
0.04 Ð 0.08 mm/0.001575 in Ð 0.00315 in
¿17.55 mm/0.6909 in
0.007 Ð 0.003 mm/0.0002756 in Ð 0.0001181 in
Top : 0.22 Ð 0.37 mm/ 0.008661 in Ð
Second : 0.33 Ð 0.48 mm/ 0.01299 in
¿17.55 mm/0.6909 in
0.05 mm/0.001969 in or less
2 mm/0.07874 in or less
0.28 Ð 0.65 mm/0.011 to 0.0256
9.3 Ð 9.5 mm/0.3661 in Ð 0.374 in
0.80 MPa/117 psi [8.2 kgf/cm ]
2
3LC
26 mm/1.024 in
#138
¿2.3/0.091 in
¿4/0.1575 in
#80
¿1.5/0.059 in
77¡
2 + 3/4
14.5 ± 1 mm/0.571 ± 0.039 in
900 rpm
750 rpm
0.01457 in
Ð 0.0189 in
2st X50D2 2011 2st X50D2 2011