TM 5-3805-260-24
BASIC BLOCK
LATER FEED MECHANISM
A. Lever.
Place adapter (24) into boring bar and tightening
setscrew (25).
ADAPTER INSTALLED
24. 1P2364 Adapter. 25. Setscrew.
Apply layout bluing to the bearing cap and
bearing bore. Oil the centering rings. Do not use
lubricant on the cutter. Use a one-half inch electric drill
with universal joint (26) to feed tool through the bore.
Service main bearings with . 010 in. (0. 25 mm)
oversize outside diameter are available to permit the bore
to be bored oversize. Bore the bore to 3. 7175 + . 0005
in. (94. 425 + 0. 013 mm).
BORING BEARING BORE
26. 1P2363 Universal
NOTE: If you use the later feed mechanism, the tool can
be driven either the boring bar or the feed mechanism.
DRIVING THROUGH FEED MECHANISM
(Typical Example)
26. 1P2363 Universal.
The bluing applied to the bearing bore indicates
the condition of the bore at the correct bore size. If
bluing shows an out of round condition, check the largest
diameter (indicated by remaining bluing) in relation to the
smallest diameter (indicated by lack of bluing). The
difference of the two must not exceed . 0010 in. (0.
025 mm).
If bluing indicates a step in the joint face,
measure the diameter at the step in relation to the
smallest diameter. A step of . 0005 in. (0. 013 mm)
on one or both sides is permissible. A maximum of .
0010 in. (0. 025 mm) over the nominal finish bore
diameter is permissible if within the described limits.
To check the bore diameter, set the IP3535 Dial
Bore Gauge to 3. 7175 in. (94. 425 mm).
CHECKING BORE
(Typical Example)
LINE BORING MAIN BEARING BORES -
Line bore all main bearing bores if bearing caps
or saddles are distorted.
Clean bearing caps and saddles. Remove all
nicks from pan rail. Plug oil holes in block with grease to
prevent chips from entering oil passages.
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