4-123. HEATER EXHAUST PIPE REPLACEMENT (M373A2D AND M373A5) (Con't).
Insulation around heater exhaust pipe is made of asbestos. Asbestos can be
dangerous If you touch it or breathe it. Wear an approved filter mask and gloves. Failure
to follow this warning may result In serious injury or death to personnel.
Remove asbestos rope around exhaust pipe (8). Discard if defective.
Working outside of semitrailer, remove six rivets (2) [screws (19) on M373A5] securing exhaust pipe (8) and
gasket (9) to front wall. Remove exhaust pipe and gasket. Discard gasket and rivets.
CLEANING AND INSPECTION
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective goggles
and gloves, and use only in a well-ventilated area. Avoid contact with skin, eyes, and
clothes, and DO NOT breathe vapors. DO NOT use near open flame or excessive heat.
The solvent's flash point is 100F-138F (38C-59C). If you become dizzy while
using cleaning solvent, immediately get fresh air and medical help. If solvent contacts
eyes, immediately wash your eyes and get medical aid.
Clean all parts with dry cleaning solvent and dry thoroughly.
Inspect exhaust pipes for cracks and holes caused by rust, broken welds, and other damage.
If exhaust pipes are defective, replace,
Ensure that drain hole at bottom of upper exhaust pipe is not clogged.
Check exhaust pipe cap for proper operation.
Inspect all other parts for defects and damage. Replace defective and damaged parts.
If removed, work outside of semitrailer to install exhaust pipe (8) and new gasket (9) on front wall using six new
rivets (2) [screws (19) on M373A5].
Insulation around heater exhaust pipe Is made of asbestos. Asbestos can be
dangerous If you touch it or breathe It. Wear an approved filter mask and gloves. Failure
to follow this warning may result in serious injury or death to personnel.
If removed, install asbestos rope around exhaust pipe (8).
If removed, work inside semitrailer to install cover plate (10), new gasket (1 1), and pipe flange (12) on semitrailer
front wall using four new rivets (1) [screws (18) on M373A5],
Install exhaust pipe (16) and new gasket (13) on mounted pipe flange (12) using six bolts (15) and new
Connect union (17) to exhaust pipe (16) and heater.