TOHATSU MX 50D2 Service Manual page 61

unctional Limit
cratches or deflection of 0.03 mm/0.0012 in
cratches or deflection of 0.03 mm/0.0012 in
When the cylinder liner cannot be repaired using #400 to #600 grit
sandpaper due to deep scratching or scuffing to the sliding surface in
contact with the piston or when the difference between the minimum and
maximum points of wear in the liner bore is 0.06 mm (0.0024 in) or more.
¿67.90 mm/2.673 in
0.21 mm/0.008268 in or more
When the difference in standard value.
0.020 mm/0.0007874 in or more
0.8 mm/0.0315 in or more
0.05 mm/0.001969 in or more
2 mm/0.07874 in or more
No longer conforms to standard value.
Valve reed fails to close
Excessive wear on seat
Valve is damaged
1) When difference in compression between cylinders exceeds
0.1 MPa/1.45 psi [1.05 kgf/cm ].
2
2) When abnormally higher than standard value.
2st X50D2 2011 2st X50D2 2011
Action To Be Taken
Clean and remove build up.
Repair by polishing the surface plate, starting with #240 to #400 grit sandpaper and
finishing with #600 grit sandpaper.
Replace if over specified limit.
Clean and remove obstruction.
Repair by polishing the surface plate, starting with #240 to #400 grit sandpaper and
finishing with #600 grit sandpaper.
Bore and hone to ¿68.50 (2.697 in) +0
Check ports and grind if necessary.
Use over size pistons and piston rings.
Replace with new part.
Clean and remove build up.
Repair or replace depending on the extent of damage.
(Repair using #400 to #600 grit sandpaper.)
Replace with new part.
Replace with new piston ring if cylinder liner wear has not exceeded the repair limit.
Repair with new crankshaft assembly.
Repair with new crankshaft assembly.
Replace with new part.
Replace entire valve assembly
1) Bore and hone to ¿68.50 + 0 Ð 0.02 mm (0 to 0.0008 in). Check ports and grind
if necessary. Use oversize pistons and piston rings.
2) Remove carbon from piston crown and cylinder head surfaces and clean exhaust
gas bypass valve.
Ð 0.02mm (0 to 0.0008 in).
GB
2
2-13