Doosan GV158TIC, Operation & Maintenance Manual

Page: 48 / 162

Technical Information - 42 -
Condition Causes Remedies
(3) Piston, piston pin &piston ring
●
Piston clearance increase as the wear
of piston and piston ring progresses
●
Wear of piston or piston pin
●
Stuck piston
●
Piston insertion poor
●
Piston ring damaged
Replace piston & piston ring
Replace
Replace piston
Replace piston
Replace piston
(4) Others
●
Wear of crankshaft, thrust bearing
●
Camshaft end play increased
●
Idle gear end play increased
●
Timing gear backlash excessive
●
Valve clearance excessive
●
Abnormal wear of tappet, cam
●
Turbocharger inner part damaged
Replace thrust bearing
Replace thrust plate
Replace thrust washer
Repair or replace
Adjust valve clearance
Replace tappet, cam
Repair or replace
6) Oil Consumption excessive
(1) Oil level elevated
●
Clearance between cylinder liner
& piston
●
Wear of piston ring, ring groove
●
Piston ring's damage, stick, wear
●
Piston ring opening's disposition
improper
●
Piston skirt part damaged or
abnormal wear
●
Oil ring's oil return hole clogged
●
Oil ring's contact poor
Replace
Replace piston, piston ring
Replace piston ring
Correct position
Replace piston
Replace piston ring
Replace piston ring
(2) Oil level lowered
●
Looseness of valve stem & guide
●
Wear of valve stem seal
●
Cylinder head gasket's leak
Replace in set
Replace seal
Replace gasket
(3) Oil leak
●
Looseness of connection parts
●
Various part's packing poor
●
Oil seal poor
Replace gasket, repair
Replace packing
Replace oil seal