
RENR5622 61
Troubleshooting Section
i02304760
Mechanical N oise (Knock) in
Engine
SMCS Code: 1000-038; 1901-038
Probable Causes
•
Faulty access
ory
•
Damage to valve train components
•
Failure of connecting rod bearing
•
Crankshaft be
arings
Recommended A
ctions
Faulty Accessory
Isolate the source of the noise. Remove the suspect
engine accessories. Inspect the suspect engine
accessories
. Repair the engine accessories and/or
replace the engine accessories.
Damage to Val
ve Train Components
Remove the valve cover from the suspect cylinder(s).
Check the fol
lowing items for damage: camshaft,
valve rotocoil, valve springs, lifters, pushrods,
bridges, and injectors. Check for valves that do not
move freely
. Remove the cylinder head and inspect
the valves. Replace any damaged parts. If damage
has occurred, clean the following components:
cylinder li
ner, piston, and exhaust system. Replace
any damaged parts.
Failure of
Connecting Rod Bearing
Inspect the connecting rod bearings and the bearing
surfaces (
journals) on the crankshaft. Check the
piston pin for excessive wear. Replace any damaged
parts.
Crankshaft Bearings
Check the c
rankshaft and/or crankshaft bearings.
Check the components for excessive wear.
i02421025
Noise Com
ing from Cylinder
SMCS Code: 1000-038; 1290-038
Probable Causes
•
Low quality fuel
•
Engine speed/timing sensor
•
Electrical connectors
•
Injector
•
Not enough lubrication
•
Toomuchvalvelash
•
Damage to valv
e train components
•
Failure of connecting rod bearing
Recommended Actions
Low Quality Fuel
Refer to Opera
tion and Maintenance Manual for
information on the proper characteristics of the fuel.
Obtain a fuel analysis.
Engine Speed/Timing Sensor
Calibrate the
engine speed/timing sensor if a
CID-FMI 261-13 Engine Timing calibration required
diagnostic code is active. Refer to the calibration
procedure Tr
oubleshooting, “Engine Speed/Timing
Sensor - Calibrate”.
Electrical C
onnectors
Check for the correct installation of the connector(s)
for the Elect
ronic Control Module (ECM) J1/P1 and/or
J2/P2. Check for correct installation of the applicable
fuel injector connectors. Repair the connector
and/or repl
ace the connector. Refer to the diagnostic
functional test Troubleshooting, “Inspecting Electrical
Connectors”.
Injector
Use Caterp
illar Electronic Technician (ET) to
determine if any diagnostic codes for the injector
solenoids are present. Perform the “Injector Solenoid
Test”. O bs
erve that the injector solenoids are being
energized on Cat ET. Perform the “Cylinder Cutout
Test”. Locate the misfiring cylinder. Refer to the
diagnost
ic functional test Troubleshooting, “Injector
Solenoids”.
Not Enoug
h Lubrication
Check the lubrication in the valve compartment.
Check for
sufficient lubrication between the injector
tappet and the rocker arm buttons. Check for blocked
oil passages. Oil passages must be clean. Ensure
that the
oil passages that send oil to the cylinder
heads are clean.