TRUCK SERVICE MANUAL
Field Troubles
Remedy
Probable Cause
Trouble
Check intake and exhaust systems
Compressor surging due to
1. Low frequency pulsation from
and remove restrictions.
restricted air flow.
turbocharger
Remove turbocharger and make
Turbocharger mis-matched to
necessary repairs or replace with new
engine air requirement.
turbocharger.
Remove turbocharger and make
Rotor rubbing Intermittently.
2. Intake
manifold
pressure
necessary repairs or replace with new
fluctuating
turbocharger.
sharply.
Remove restriction In Intake or
Turbocharger surging.
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exhaust system.
Remove and rebalance or replace
Rotor out of balance.
3. Excessive
vibration
In
rotor assembly.
turbocharger
Remove turbocharger and make
Rotor rubbing.
necessary repairs or replace with new
turbocharger
Remove turbocharger and make
Excessive oil seal clearance In
4. Lubricating oil in
intake
necessary repairs or replace with new
turbocharger.
manifold or exhaust stack.
turbocharger.
Clean or replace breather.
Restricted crankcase breather.
Check air intake piping for restriction
Restriction in air intake.
Turn bearing housing to proper angle.
Oil drain line angle in excess of 30
deg. from vertical.
Check for worn piston ring seals.
Excessive blow-by.
Check oil drain lines and fittings;
Restriction of oil drain.
replace if necessary.
Check oil level in cleaner and size of
Oil pull-over from oil bath air
5. Oily or dirty appearance in
cleaner. Check for possible entry of
cleaner.
compressor wheel flow passage.
water In air cleaner.
Use Teflon tape-on fitting. Tighten to
Loose oil inlet or drain fitting
6. Oily appearance on bearing
proper torque.
housing or on V Bands
Remove and clean
Accumulation of dirt on compressor
7. Turbocharger speed and
wheel
intake manifold pressure low. Exhaust
temperature high and excessive
smoke.
Check air cleaner for oil level and size
Oil pull-over from air cleaner.
of cleaner.
Repair leaks.
Leaks in Intake or exhaust piping.
Clean or replace as required.
Air cleaner too small or restricted.
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