TRUCK SERVICE MANUAL
Trouble Shooting
Initial Performance Check
Trouble Probable Cause Remedy
1. No oil flow through turbocharger
Clogged oil lines or oil passages in
Remove oil lines Chef k arid lean oil
main casing.
Iines and oil passages in m ain casing
Improper type of hose used.
Replace inlet hose with SAE No. 6
wire braid hose with Teflon liner and
outlet with SAE No. 16 wire braid
hose with Teflon liner or 7/8 inch
[22.2 mm] O.D. steel tubing.
Fluid temperature range of hose
should be -100 deg. F [-73 deg. C]
to 450 deg. F [232 deg. C].
2. Rotor tails to turn on initial start of
Rotor blocked by foreign object
Remove inlet and exhaust connections,
engine.
remove foreign object (s).
Piping strains transmitted to
Install new piping separately supported
turbocharger causing casing
and check turbocharger for damage.
distortion.
Rotor rubbing on turbine casing,
Remove turbocharger and make
compressor casing or both.
necessary repairs or replace with new
turbocharger.
3. Rotor turns freely by hand but falls
Exhaust manifold or exhaust
Remove restriction.
to run when cranking engine
piping blocked or closed off.
4. Rotor fails to coast freely to stop
Rotor rubbing casings.
Remove turbocharger and make
after Initial engine start.
necessary repairs or replace with new
turbocharger.
Carbon build-up on oil seal or back
Remove turbocharger from engine,
of turbine wheel
disassemble, clean and replace worn
parts.
Tight bearings or oil seals.
Remove turbocharger and make
necessary repairs or replace with new
turbocharger.
Foreign object In turbocharger
Remove turbocharger from engine.
disassemble, inspect and repair or
replace with new turbocharger.
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