Komatsu PC88MR-10 Shop Manual page 1016

40 Troubleshooting
Troubleshooting of engine (S-mode)
No. Cause
Defective contact between
14
valve and valve seat
15 Defective piston ring
40-528
Point to check, remarks
Measure compression pressure (see
Standard value table).
(Reference: See Testing and adjusting,
"Testing compression pressure".)
Check valve clearance.
(Reference: See Testing and adjusting,
"Testing and adjusting valve clearance".)
Check exhaust gas at KDOC muffler outlet.
(Reference: See Testing and adjusting,
"Testing exhaust gas color".)
Measure compression pressure (see
Standard value table).
(Reference: See Testing and adjusting,
"Testing compression pressure".)
Check piston ring and piston ring groove.
Remedy
Correct contact
between valve and
valve seat or replace
them.
Replace piston ring or
piston.
PC88MR-10