SDLG WP6, Руководство по обслуживанию

Страница: 67 / 121

Service Manual for WP6 Diesel Engine
57
3422 Steps to Disassemble Piston-Rod Assembly
(1) Check before disassembling. Check connecting rod axial backlash, check tightening torque of
connecting rod bolts;
(2) Tilt and lay the engine on its side, rotate the flywheel until the to-be removed piston is in BDC,
and then remove connecting rod bolts and cap;
(3) Rotate the flywheel until the to-be removed piston is in TDC, knock the piston out with
wooden hammer, proceed with caution to avoid jamming cylinder block with connecting rod
tip.
(4) Remover other pistons in the same way, number and place them orderly.
(5) Remove circlip on two sides of piston with internal circlip plier and push piston pin out, take
down the connecting rod body. Number the piston pins, connecting rod bodies and place them
orderly.
(6) Remove first compression ring, second compression ring and oil ring with piston ring plier and
mark them.
3423 Inspection and Maintenance of Piston-Rod Assembly
(1) Check whether there is crack on combustor throat fillet and piston pin boss; Check piston skirt
and piston head for cylinder scoring phenomenon; Check wear condition of piston pin hole.
(2) Check wear condition of piston ring outer edge; Check wear condition of piston ring upper and
lower end face.
(3) Check wear condition of piston pin external surface.
(4) Check whether there is crack on connecting rod tip bottom hole, connecting rod body and
connecting rod small end oil hole; Check alloy layer of connecting rod shell for abnormal wear
and peeling phenomenon; Check wear condition of connecting rod side faces, check crooking
condition of connecting rod body.
(5) Check wear condition of connecting rod bearing shell, check its alloy layer for discoloration,
peeling and slippage phenomenon.
3424 Steps to Assemble Piston-Rod Assembly
(1) Install one circlip into piston circlip groove with internal circlip plier, and rotate the circlip to
ensure it is properly fitted. The end with corner angle should face inward, and its opening
should be upward.
(2) Insert small end of connecting rod into piston inner cavity and align it to piston pin holes, and
then install piston pin, finally install the other circlip to the other side of the piston. Note that