Observable Diagnostics and Tests
DPSG,RG40854,282 –19–10AUG99–2/2
3. If it appears that boost pressure is forcing oil
through the drain line, and/or blow-by decreases
with the drain line disconnected from the block,
replace the turbocharger and retest.
04
150
13
DPSG,RG40854,283 –19–10AUG99–1/1
Check for Turbocharger Oil Seal Leak
RG10634 –UN–30NOV99
Turbocharger Oil Seal Leak
A—Intake Hose
B—Exhaust Flange
C—Oil Return Line
Seals are used on both sides of the turbocharger rotor
assembly. The seals are used to prevent exhaust gases
and air from entering the turbocharger housing. Oil
leakage past the seals is uncommon but can occur.
A restricted or damaged turbocharger oil return line can
cause the housing to pressurize causing oil to leak by the
seals. Additionally, intake or exhaust restrictions can
cause a vacuum between the compressor and
turbocharger housing causing oil to leak by the seals.
1. Remove intake tube (A) and exhaust pipe (B).
NOTE: The intake tube from the air cleaner (not included
in picture) would not have to be removed for this
test.
2. Inspect the intake tube and turbocharger turbine casing
for evidence of oil leakage.
If oil leakage is present, perform the following:
• Inspect turbocharger oil return line (C) for kinks or
damage. Replace if necessary.
• Check the air intake filter, hoses, and crossover tube
for restrictions.
• Check the exhaust system for restrictions to include
position of exhaust outlet.
3. Perform necessary repairs and retest.
CTM100 (06APR04)
04-150-13
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=361
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