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Page Title:
FIGURE 324. CHECKING TAPPET BORE CLEARANCE. |
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 (8) C o r e hole plugs. Inspect core hole
Note. Top bore average must not ex-
plugs (figs. 318, 319, and 321) for evi-
ceed bottom bore average. Compare the
dence of coolant leakage. Mark areas
two top measurements taken 90 degrees
which show evidence of coolant leaks
apart. These measurements must com-
for repair (par. 160).
pare within 0.0015-inch or liner must be
considered as being out-of-round and
(9) Dowel pins. Inspect dowel pins (figs.
must be replaced (par. 162).
Mark damaged pins for repair.
(4) Tappet bore. I n s p e c t tappet bores
against limits specified in repair and re-
(10) Preparation for main bearing bore in-
build standards (par. 292) by following
spection. Serviceable bearing halves
instructions on figure 324.
must be used for main bearing bore
check. If original bearing halves are
used, they must be installed in their
original locations.
CLEARANCE.
(5) Camshaft bearings. Inspect camshaft
bearings (AR, AS, AT, and AU) for
pitting, galling, burs, nicks, and cracks.
Check for discoloration, which indicates
o v e r h e a t i n g . Check bore diameters
against limits specified in repair and
rebuild standards (par. 292).
(6) Piston cooling nozzle. Check piston
cooling nozzle (AP) for dents, kinks,
nicks, scratches, or burs. Check 0.060-
inch diameter hole in nozzle to make
certain it is open. Clean opening with a
wire probe and wash nozzle in dry-
cleaning solvent or mineral spirits
paint thinner. Clear opening with com-
pressed air. Replace unserviceable noz-
zles.
(7) Miscellaneous attaching parts. Inspect
main bearing cap screws (AF) and
washers (AE). Check for damaged
threads, nicks, burs, and other unser-
viceable conditions. Replace all unser-
viceable parts.
198
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