TM 9-2320-363-34-1
CAMSHAFT AND BEARINGS REPLACEMENT (CONT)
W A R N I NG
To prevent injury, compressed air will not exceed 30 psi (207 kPa). Use only
with effective chip guarding and personal protective equipment, goggles,
shield, and gloves.
2.
MAKE SURE ALL OIL PASSAGES ARE CLEAR. DRY WITH COMPRESSED AIR.
3.
USE GENERAL CLEANING METHODS TO CLEAN ALL PARTS (PAGE 2-30).
1.
INSPECT CAMSHAFT LOBES AND JOURNALS FOR SCORING, PllTING, OR FLAT SPOTS. IF
CAMSHAFT IS SCORED, INSPECT CAMSHAFT FOLLOWER ROLLERS.
2.
IF THERE IS DOUBT OF CAMSHAFT ACCEPTABILITY, DETERMINE EXTENT OF CAMSHAFT LOBE
WEAR AS FOLLOWS:
A.
USING SET OF O. O15-O.O1O-IN. (0.038-0.254-mm) FEELER GAGES (1) AND PIECE OF
SQUARE, HARD MATERIAL (2), MEASURE FLATS ON INJECTOR RISE SIDE (3) OF
CAMSHAFT LOBES (4).
B.
IF FLATS MEASURE LESS THAN 0.003 IN. (0.076 mm) IN DEPTH, BUT THERE ARE NO
OTHER CAMSHAFT DEFECTS, CAMSHAFT IS SATISFACTORY.
NOTE
If one camshaft bearing needs replacement, replace all
camshaft bearing shells.
c.
INSPECT CAMSHAFT BEARINGS FOR SIGNS OF EXCESSIVE WEAR, SCORING, OR
PITTING.
D.
DETERMINE CAMSHAFT BEARING CLEARANCE:
NOTE
Make sure locating tangs are correctly positioned.
(1) WITH LOWER CAMSHAFT BEARING SHELLS INSTALLED IN CYLINDER HEAD, INSTALL
CAMSHAFT (5) ON SEVEN CAMSHAFT BEARINGS.
(2) INSTALL SEVEN UPPER CAMSHAFT BEARING SHELLS (6) IN SEVEN CAMSHAFT
BEARING CAPS (7).
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