Piston

Removal of the piston pin & piston rings
Remove the piston pin circlips with use of pliers (P/#28190- 000130).
(2) Draw out the piston pin while holding the connecting rod.
(3) Make two loops from wire, and then remove a piston ring with them.
Checking & servicing:
Check the state of carbon adherent on the piston and the state of wear various parts.
(1) Check the contact of piston skirt and piston hole.
(2) Check the piston by ~Penetrate Test.JJ for cracks on its top surface and ring groove (outside & inside).
(3) Remove the piston cooling case cover, and check for adherent scale.
(4) Measure the dimensions of various piston parts and of the piston pin.
(5) If possible, replace the piston rings with new ones, considering the time to the next servicing.
(6) If the piston is· replaced with the new one, provide the same set mark on the new one as that on the previous one.
Incorporation of the piston incorporate the piston in the sequence reverse to
drawing-out, paying attention to the following points.
(1) Incorporate the perforated piston cooling case
cover on the operating side, apply a proper screw lock agent (Tokyo Three-Bond Screw Lock No.1 or its equivalent) on the bolts, and tighten them to fix the cover.
(2) Incorporate the piston pin circlip with its opening facing straight down.
(3) Incorporate the piston rings with their marked sides facing upward and their cuts shifted 120°from those of adjacent rings.
(4) Incorporate the oil ring with its coil joint shifted 180. from its cut.
(5) Incorporate the piston and connecting rod, aligning their set marks with each other.
(6) Apply the lubricating oil to the piston, cylinder liner and crankshaft.
(7) Set the piston inserting guide (P/#146673- 92140), and incorporate the piston.
(While tapping the piston with a resin hammer,
drive the piston down.)
(8) Tighten the connecting rod bolts.