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 TM 9-2815-226-34-1
o. Limits listed in the following steps must be maintained within Critical Region. Dimensional value of Critical Region
is the vertical distance measured downward from the crankpin centerline and extending longitudinally for all crank
webs between region (3) on the crankpin and crankpin hole (1) on the journal.
CAUTION
WHENEVER STRUCTURAL DAMAGE HAS OCCURRED TO AN ENGINE SUCH AS
PISTON OR VALVE BREAKAGE, THROWN ROD, ETC., A MAGNAFLUX
INSPECTION MUST BE ACCOMPLISHED TO DETECT POSSIBLE RUPTURES AND
CRACKS. FAILURE TO ACCOMPLISH THIS INSPECTION COULD LEAD TO EARLY
ENGINE FAILURE AND SERIOUS DAMAGE.
(1) Indications located less than 1 in. (25.4 mm) from the major axis of centerline (8) adjacent web (measure
circumferentially) must not exceed the following limits:
LEGEND:
1. CRANKPIN HOLE
13.
KNURLING
2. CRANKPINS
14.
CHAMBER OF MAIN BEARING OIL HOLE
3. CRANKPIN WALL
15.
MAIN BEARING JOURNAL SURFACES
4. FILLETS-MAIN JOURNAL-DEEP
16.
COUNTERWEIGHT CORNERS
5. MAIN JOURNAL FILLETS
17.
WEBS
6. CRITICAL REGION
18.
WEB SURFACES
7. MAJOR JOURNAL WALLS
19.
CONNECTING ROD BEAR ING CRANKSHAFT
8. MAJOR AXIS OR CENTERLINE OF
JOURNAL SURFACES
9. JOURNAL SURFACE DEPTH
20.
CONNECTING ROD BEARING CRANKSHAFT
10. JOURNAL SURFACE THICKNESS
21.
WEB PERIPHERY
11. REAR SEAL SURFACE FACES
22.
MAIN JOURNAL WALLS
12. SEAL AREA
23.
FLANK CHEEK
24.
THRUST FLANGE FILLET
(a) Light indications in or entering fillets (5) are acceptable if not more than 1/8 in. long (open) or 1/4 in. long
(subsurface).
(b) Light open indications on crankpin (2) and main journal walls (18)or bearing surface that extend closer than 1/8 in.
to fillets (5), but do not enter fillets, are acceptable if 3/16 in. long or less. Light subsurface indications are
acceptable.
3-121
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