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 TM 9-2815-226-34-1
(4) Cut bore and bearing cap.
CAUTION
DO NOT USE DRILL RATED AT LESS THAN 10 AMPERES OR OVER 450 RPM. USE
OF HIGH SPEED AND/OR LOW AMPERE RATED DRILL COULD DAMAGE DRILL
DUE TO HEAVY LOAD.
(a) Secure universal driver to 3/4 in. (19.05 mm) heavy duty hand drill and engage driver with drive
adapter on end of boring bar.
CAUTION
TO PREVENT DAMAGE TO TOOL BIT OR BORE, KEEP TOOL BIT WELL OILED
WHILE BORING.
(b) Apply cutting oil to tool bit and start drill.
(c) Stop drill when tool bit holder passes completely through bore.
(d) To cut next journal (if necessary), remove tool bit holder from boring bar.
(e) Pull out knob on feed assembly and turn 1/4 turn.
(f) Push in on knob until it stops against feed assembly. This places boring bar in start position.
(g) Turn knob 1/4 turn until pin seats in slot. Automatic feed is now reengaged.
(h) Install tool bit holder on boring bar next to face to be cut. Ensure that tool bit cutting edge is turned in
direction of drill rotation. Boring bar will automatically feed toward feed assembly.
(i) Proceed with boring operation following steps (a), (b), and (c) above.
(j) Remove drill, drive adapter cutter holder, and feed assembly from end of boring bar.
(k) Pull boring bar out far enough to slip on checking ring.
(l) Lubricate checking ring with engine oil and slide ring through newly cut bore(s) to check alinement.
(m) Remove checking ring and boring bar.
(n) Measure bore(s) with dial bore gage to ensure bore does not ex ceed 4.7505 in. (120.6627 mm).
(o) If a bore is found out of alinement or is larger than specified, it will have to be enlarged to accept a
repair sleeve.
3-97
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