Troubleshooting

48 RENR2696-01
Troubleshooting Section
i01798125
Engine Vibration
Note: This is NOT an electronic system problem.
Refer to Testing and Adjusting for information on
determining the cause of this condition.
Probable Causes
•
Engine supports
•
Malfunctioni
ng individual cylinder
•
Valve lash
•
Compression (cylinder pressure)
•
Fuel injectio
n nozzles
•
Turbocharger (if equipped)
Recommended Actions
Engine Supports
1. Start the engi
ne and run the engine through
the speed range. Check for any of the following
conditions:
•
Loose engine supports
•
Loose mounti
ng brackets or broken mounting
brackets
•
Loose bolts
•
Omitted bolts
2. Make all necessary repairs. Ensure that the
repairs have eliminated the problem. If the
vibration is
still present proceed to “Malfunctioning
Individual Cylinder”.
Malfunctio
ning Individual Cylinder
1. With the engine speed at a fast idle, loosen the
high pressu
re fuel line to the fuel injection nozzle
of number 1 cylinder. Note if there is any reduction
in engine speed. Tighten the high pressure fuel
line to the
fuel injection nozzle.
2. Individually repeat this procedure for each fuel
injection
nozzle. If there is no reduction in the
engine speed proceed to “Check The Fuel
Injection Nozzles”.
3. If there is a reduction in engine speed proceed to
“Valve Lash”.
Valve Lash
1. Ensure that the valve lash is correct. Reset the
valve lash if it is not correct. Refer to Systems
Operation, Te
sting and Adjusting, “Engine Valve
Lash - Inspect and Adjust”.
2. If the repair d
oes not eliminate the fault proceed to
“Check for Low Compression (cylinder pressure)”.
Check for Low
Compression (cylinder
pressure)
1. Remove the fu
el injection nozzles from the cylinder
head. Refer to Disassembly and Assembly, “Fuel
Injection Nozzle - Remove”.
2. Check the fuel injection nozzles. Refer to Testing
and Adjusting, “Fuel Injection Nozzle - Test”.
3. Perform a compression test on each cylinder.
Refer to Systems Operation, Testing and
Adjusting,
“Compression - Test”.
4. Ensure that the repairs have eliminated the
problems.
5. If the problem has not been eliminated, proceed
to “Check th
e Fuel Injection Nozzles”.
Check the Fuel Injection Nozzles
1. Remove the fuel injection nozzles from the cylinder
head. Refer to Disassembly and Assembly, “Fuel
Injection
Nozzle - Remove”.
2. Check the fuel injection nozzles. Refer to Testing
and Adjust
ing, “Fuel Injection Nozzle - Test”.
3. Ensure that the repairs have eliminated the
problems.
4. If the problem has not been eliminated, proceed
to “Turboc
harger (if equipped)”.
Turbocharger (if equipped)
Note: The turbochargers that are equipped on 1100
Series engines are nonserviceable items. If any
mechanic
al fault exists then the turbocharger must
be replaced.
1. Ensure th
at the mounting bolts for the turbocharger
are tight.