System Operational Checks
Run engine at fast idle and check blow-by tube.
YES: Go to next check.
Are fumes barely visible at the blow-by tube at fast idle,
NO: If blow-by is
with no load?
excessive, go to
NOTE: Excessive blow-by indicates that piston rings and
Test in Group 9010-25.
cylinder liners do not seal off the combustion chamber.
This is a comparative check that requires some
experience to determine excessive blow-by.
LOOSE OR WORN
Run engine at slow idle.
Move hydraulic control lever to operate a hydraulic function over relief to put engine
NO: Go to Abnormal
Engine Noise, in Group
Does engine run smooth, no knocking or rattling noise?