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MAINTENANCE
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MANUAL
wheel circumference and the blower housing should
be 1-1 /8". Clearance between the side of the blower
wheel and blower inlet venturis should be I /4 ". The
same clearance should be maintained at both sides.
INSTALLATION OF BLOWER GEAR
BOX RUBBER MOUNTS
To properly insert the blower gear box rubber mounts
only water should be used as a lubricant.
Insertion of the mounts into the socket using glycerine
or any other lubricant, will result in the tail of the mounts
flairing out with the rubber rupturing or a potential
rupture after each installation.
Using water as the lubricant for inserting rubber
mounts will achieve excellent results, in that, the tail of
the mounts will go into compression when the assembly is
drawn up tight with the proper displacement bulge all the
way around.
NOTE: In no case should a lubricant be used which
maintains lubricity after assembly and engine startup.
DISASSEMBLY
Remove four screws holding down top cover and
remove cover and gasket. NOTE: When cover gasket is not
available, seal in this area with Permatex Silicone Sealant
M.C.I. Part No. 19-16-43 I or No. 734 R.T.V. Sealastic
Adhesive M.C.l. Part No. 19- I 6-430. This sealant may be
purchased from Motor Coach Industries Service Parts Divi-
sion. Remove screws and output shaft covers. Remove cap-
screws that fasten the bearing carrier to the housing. The
bearing carriers, input shaft, bearings and gears will then
come out as a unit.
To disassemble input shaft assembly, remove snap ring
from inner end at bevel gear. Pull gear from shaft, the
bearings and spacer can now be removed from shaft. Using
a soft mallet. tap the output shaft out of the housing, the
tapered roller bearings and bevel gear will also come out
with the shaft. Pull or tap off the bearing cones, slide off
the spacers and pull or press off the bevel gear.
Reassembly is the reverse of disassembly.
REPAIR AND ASSEMBLY
The gears are only supplied in matched honed sets
and must be installed so that the timing marks on the
back of the gears register.
The back edges of the mitre gears must be flush
when installed. This can be accomplished by using
the proper number of brass shim gaskets under the
output shaft bearing caps.
The tapered roller bearings must be adjusted by
means of brass shim washers so that there is no per-
ceptible play or clearance in them.
Backlash of the spiral bevel gears is also controlled
by the use of brass shims between the bearine carrier
and
the
main
housing
.003" to
.004" clearance
+
or - .002" is recommended between the gear teeth.
Care must be exercised in installing the shaft seals
over the sharp keyways in the shafts. To avoid
nicking the inner sealing lip a thin tapered bushing
should be made up to facilitate entry of the shaft in
the seal and protect the seal while it is being slid over
the keyways.
ALARMSTAT
DESCRIPTION
This instrument, which controls the warning light
and buzzer to indicate engine overheating, is covered
under Section 7 (Electrical) of this manual.
l . Alarmstat lnstal led on
L.H. Side of Engine
SHUTTER STAT
DESCRIPTION
The shutterstat controls the supply of compressed
air to the radiator shutter air cylinders and blower
damper air cylin~ers. ~he sh:titterstat is mounted on
the left-hand. radiator inlet !me and can be reached
by opening the rear engine compartment service
doors.
When engine coolant temperature reaches the 180
degrees to 183 degrees range, the sh:titters_tat cuts off
the supply of air to the shutterstat a,~ cylinders, and
the radiator shutters open. When engine temperature
is below the setting of the shutterstat, air from the
coach air system is allowed to enter the shutterstat air
cylinders closing the shutters and blower dampers.
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