Forward Clutch Assembly; Measuring Clutch Disc Thickness; Checking Return Spring Length; Testing Piston Check Ball - Jeep 200 Cherokee Service Manual

21 - 320 AW–4 AUTOMATIC TRANSMISSION
DISASSEMBLY AND ASSEMBLY (Continued)
(20) Measure clutch disc thickness (Fig. 260). Min-
imum allowable thickness is 1.51 mm (0.0595 in.).
Replace clutch pack if any disc falls below specified
minimum thickness.
Fig. 260 Measuring Clutch Disc Thickness
1 – CLUTCH DISC
2 – MICROMETER
(21) Measure free length of piston return springs
with springs mounted in retainer (Fig. 261). Length
should be 19.47 mm (0.767 in.). Replace springs and
retainer if length is incorrect.
(22) Inspect clutch piston check ball (Fig. 262).
Ball should move freely within piston. Check ball
seating by applying low pressure compressed air to
ball feed hole. Ball should seat firmly and not leak
air.
(23) Measure inside diameter of bushing in clutch
drum hub. Maximum allowable diameter is 24.08
mm (0.9480 in.). Replace clutch drum if bushing
inside diameter is greater than specified.
ASSEMBLY
(1) Lubricate bearing and race assembly with
petroleum jelly and install it in clutch drum (Fig.
263). Race side of assembly faces downward and
toward drum. Bearing rollers face up (Fig. 263)
(2) Coat new clutch drum shaft seal rings with
petroleum jelly. Before installing drum shaft seal
rings, squeeze each ring so ring ends overlap (Fig.
264). This tightens ring making clutch installation
easier.
Fig. 261 Checking Return Spring Length
1 – PISTON RETURN SPRINGS
2 – SPRING RETAINER
Fig. 262 Testing Piston Check Ball
1 – PISTON CHECK BALL
2 – USE LOW AIR PRESSURE FOR TEST
(3) Install seal rings on shaft. Keep rings closed as
tightly as possible during installation. Avoid over-
spreading them.
(4) Mount clutch drum on overdrive support.
(5) Lubricate and install new O–ring on clutch
drum hub (Fig. 257).
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