9
CYLINDER HEAD ASSEMBLY
Remove all carbon deposits from discharge cavities and all
rust and scale from cooling cavities of cylinder head body.
Scrape all foreign matter from body surfaces and use air
pressure to blow dirt particles from all cavities.
Discharge valves can be dressed by lapping them on a
piece of fine crocus cloth on a flat surface, provided they
are not excessively worn.
CYLINDER BLOCK
Clean carbon and dirt from inlet and unloader passages.
Use air pressure to blow carbon and dirt deposits from
unloader passages.
Inlet valves, as in the case of discharge valves, not worn
excessively can be cleaned by lapping them on a piece of
fine crocus cloth on a flat surface.
LUBRICATION
Check the exterior of the compressor for the presence of oil
seepage and refer to the TROUBLESHOOTING section for
appropriate tests and corrective action.
OIL PASSING
All reciprocating compressors currently manufactured will
pass a minimal amount of oil. Air dryers will remove the
majority of oil prior to entrance into the air brake system.
For particularly oil sensitive systems the Bendix
®
PuraGuard
®
QC
™
oil coalescing filter can be used in conjunction with a
Bendix air dryer.
If compressor oil passing is suspected, refer to the
TROUBLESHOOTING section and TABLE A for the
symptoms and corrective action to be taken. In addition,
Bendix has developed the "Bendix Air System Inspection
Cup" or BASIC test to help substantiate suspected excessive
oil passing. The steps to be followed when using the BASIC
test are presented in APPENDIX A at the end of the
TROUBLESHOOTING section.
OIL PASSAGE
Clean thoroughly all oil passages through crankshaft,
connecting rods, crankcase, end covers and base plate. If
necessary, inspect passages with a wire and blow foreign
matter out with air pressure.
INSPECTION OF PARTS
CYLINDER HEAD BODY
Inspect cylinder head body for cracks or damage.
WATER-COOLED TYPE
Use air pressure to test water jackets of cylinder head and
block for leakage. Replace unit if leakage is found.
DISCHARGE VALVES AND SEATS
If discharge valves are worn and grooved where they contact
the seats, they should be replaced. If the discharge valve
seats are worn excessively so that there is no longer enough
metal left to reclaim them by lapping, the seats should be
replaced.
DISCHARGE VALVE SPRING AND CAP NUTS
Replace all used discharge valve springs and cap nuts if
cap nuts cannot be reclaimed.
CRANKCASE AND END COVERS
Check for cracks or broken lugs in crankcase and end
covers. Also, check oil passages to make sure they are
open and clean.
If an oil seal ring is used in the end cover, check fit of ring in
ring groove. There should be .008 in. (.203 mm) to .015 in.
(.381 mm) clearance at the gap when placed in the end bore
of the crankshaft. If the oil ring is worn thin or is damaged, it
should be replaced. Inspect oil ring groove in end cover; if
groove is worn excessively, replace end cover or machine
groove for next oversize oil seal ring. If the crankshaft main
bearings are installed in the end cover, check for excessive
wear and flat spots; replace if necessary.
FIGURE 15 - TU-FLO
®
600 AIR COMPRESSOR BLOCK ASSY