TM 9-4110-255-14
5-40. COMPRESSOR B1 TESTING, SERVICE. REPAIR, AND REPLACEMENT .-Continued
(4) Shaft Seal.
CAUTION
Carbon seals are fragile and must be handled with care to prevent damage.
Do not touch sealing surfaces of carbon seals with fingers. Acids in the skin will damage seal.
(a) Discharge the refrigeration system (para 5-10).
(b) Remove compressor per d. below.
(c) Remove compressor pulley (para 5-6).
(d) Remove six bolts (33), seal plate (34), gasket (35), and carbon ring (36) being careful not to touch
carbon sealing surfaces with fingers. Discard gasket, retain carbon ring and seal plate for use during
assembly.
(e) Tap crankshaft (37) using appropriate hammer to loosen shaft seal (38).
(f) Using two long screwdrivers, remove shaft seal (38) by carefully prying it out. Discard shaft seal.
(g) Remove new carbon ring (36) from new shaft seal (38) being careful not to touch carbon sealing
surfaces with fingers.
(h) Apply a small amount of lubricating oil onto new shaft seal (38) neoprene bellows where it contacts
the crankshaft (37). Slide shaft seal onto crankshaft until it just starts to grip shaft being careful not
to touch carbon sealing surfaces with fingers.
CAUTION
Carbon ring notches must be aligned with seal plate tabs when installed to prevent damaged.
(i) Install old carbon ring (36) into old seal plate (34). Be sure notches in carbon ring align with tabs in
seal plate. Be careful not to touch carbon sealing surfaces with fingers. Install seal plate and two
bolts (33) on opposing sides. Tighten bolts to seat new shaft seal (38).
(j) Remove two bolts (33), old seal plate (34), and old carbon ring (36). Discard seal plate and carbon
ring.
CAUTION
Carbon ring notches must be aligned with seal plate tabs when installed to prevent damaged.
(k) Apply a small amount of lubricating oil onto new carbon ring (36) and new seal plate (34) where it
contacts carbon ring being careful not to touch carbon sealing surfaces with fingers. Be sure notches
in carbon ring align with tabs in seal plate and install new carbon ring into new seal plate.
5-76
