TM 9-2320-272-24-4
5-27. CAMSHAFT AND GEAR MAINTENANCE (Contd)
d. Cleaning and Inspection
WARNING
Drycleaning solvent is flammable and toxic. Do not use near open
flame and always have a fire extinguisher nearby when solvents
are used. Use only in well-ventilated places, wear protective
clothing, and dispose of cleaning rags in approved container.
Failure to do this may result in injury or death to personnel and/or
damage to equipment.
Clean all camshaft (6) components with drycleaning solvent and dry with clean rag.
1.
Inspect camshaft support (1) for wear. Replace camshaft support (1) if excessively worn.
2.
Inspect camshaft (6) for cracks, pits, and breaks. Replace camshaft (6) if cracked, pitted, or broken.
3.
Inspect exhaust (4) and intake (2) camshaft lobes for wear.
4.
a. Measure outside diameter of exhaust camshaft lobe (4) at several positions. Replace camshaft (6)
if outside diameter is less than 2.0313 in. (1.5950 mm).
b. Measure outside diameter of intake camshaft lobe (2) at several positions. Replace camshaft (6) if
outside diameter is less than 2.0383 in. (51.7728 mm).
c. Measure outside diameter of lift pump lobe (5) at several positions. Replace camshaft (6) if
outside diameter is less than 1.626 in. (59.9618 mm).
Inspect camshaft journals (3) for wear. Measure outside diameter of camshaft journals (3) at several
5.
positions. Replace camshaft (6) if outside diameter is less than 2.3067 in. (59.9618 mm).
Inspect camshaft gear (7) for cracks, pits, and breaks. Replace camshaft gear (7) if cracked, pitted,
6.
or broken.
Inspect camshaft gear teeth (8) for pitting and cracks at root of teeth (8). Replace camshaft gear (7)
7.
if pitted or cracked.
Inspect camshaft bushings (9) for wear. Measure inside diameter of camshaft bushing (9) at several
8.
positions. If inside diameter exceeds 2.367 in. (60.122 mm), mark camshaft bushing (9) for
replacement.
NOTE
Perform steps 9 through 14 for replacing camshaft bushings.
Remove expansion plug (11) from rear of engine block (10). Discard expansion plug (11).
9.
Using cam bushing replacement tool, remove camshaft bushing (9) from bushing bore (14). Discard
10.
camshaft bushing (9).
Measure inside diameter of camshaft bores (14). Replace engine block (10) if inside diameter
11.
exceeds 2.520 in. (64.008 mm).
CAUTION
When installing camshaft bushing, ensure oil hole and oil hole
passages are aligned. Failure to do so will result in premature
failure and damage to engine.
Mark engine block (10) and new camshaft bushing (9) to ensure oil holes (12) and (13) are aligned.
12.
Using cam bushing replacement tool, install new camshaft bushing (9) in camshaft bushing bore (14).
13.
NOTE
Perform step 14 if rear camshaft bushing was removed.
Apply adhesive sealant to mating surfaces of new expansion plug (11) and install on engine block (10).
14.
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