Bendix Commercial Vehicle Systems TU-FLO 750 COMPRESSOR 6/08 - Manual (Page 28)

Symptom: What it may indicate: What you should do:
28
This guide attempts to cover most com-
pressor system problems. Here are some
rare sources of problems not covered in
this guide:
• Turbocharger leakage. Lubricating
oil from leaking turbocharger seals can
enter the air compressor intake and give
misleading symptoms. • Where a compressor does not have
a safety valve installed, if a partial or
complete discharge line blockage has
occurred, damage can occur to the
connecting rod bearings. Damage of this
kind may not be detected and could lead
to compressor problems at a later date.
17.0 Compressor
leaks coolant (a) Improperly installed plugs or
coolant line fi ttings.
(b) D a m a g e d c o m p r e s s o r h e a d
gasket.
(c) Porous compressor head casting.
Inspect for loose or over-torqued fi ttings.
Reseal and tighten loose fi ttings and plugs
as necessary. If overtorqued fi ttings and
plugs have cracked ports in the head,
replace the compressor.
An air leak at the head gasket may indicate
a downstream restriction such as a freeze-
up or carbon blockage and/or could indicate
a defective or missing safety valve. Find
blockage (go to 9.0(f) for details.) and then
replace the compressor. Do not re-use the
safety valve without testing. See Symptom
12.0(a).
If casting porosity is detected, replace the
compressor.
18.0 Noisy
compressor
(Multi-cylinder
compressors only) (a) Damaged compressor. Replace the compressor.
Testing for leaks with
soap solution.
16.0 Compressor
leaks air (a) C o m p r e s s o r l e a k s a i r a t
connections or ports.
(b) Compressor unloader mechanism
malfunction.
(c) D a m a g e d c o m p r e s s o r h e a d
gasket.
Check for leaking, damaged or defective
compressor fi ttings, gaskets, etc. Repair
or replace as necessary.
Go to Test 6 on page 30.
An air leak at the head gasket may indicate
a downstream restriction such as a freeze-
up or carbon blockage and/or could indicate
a defective or missing safety valve. Find
blockage (go to 9.0(f) for details.) and then
replace the compressor. Do not re-use the
safety valve without testing. See Symptom
12.0(a).
Other Miscellaneous Areas to Consider
Head
gasket
location