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TM 5-4320-306-24
4-8. REPLACE/REPAIR CAMSHAFT (Continued)
CLEANING/INSPECTION :
WARNING
Death or serious injury could occur if diesel fuel oil is not handled carefully. Use in a well-ventilated area
away from open flame, arcing equipment, ignition sources, heaters, or excessive heat. Always store fuel
in proper, marked containers. DO NOT SMOKE.
Death or serious injury could occur if compressed air is directed against the skin. Do not use compressed
air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kgcm2) or less. When
working with compressed air always use chip guards, eye protection, and other personal protective
equipment.
Live steam used for cleaning shall not exceed 100 psi (690 kPa). Use goggles or a face shield for eye
protection.
1
Soak camshaft (1) in clean diesel fuel oil Then run a wire brush through the camshaft oil passage (3) to remove
any foreign material or sludge.
2
Clean exterior of camshaft and blow through the oil passage with compressed air.
3
Clean gear (4), cams (5), and washer (2) with diesel fuel oil and dry with compressed air.
4
Inspect washer (2) and replace if damaged or worn.
NOTE
If a new camshaft is to be installed, steam clean it to remove the rust preventive. Blow out the oil
passages with compressed air.
5
Inspect cams (5) and bearing journal (6) for wear and scoring. If cams are scored, inspect tappets in accordance
with paragraph 4-6. Replace camshaft (1) if journals or cams are excessively worn or scored.
6
Replace camshaft (1) if bent or damaged.
7
Examine all contact surfaces. If surfaces are scratched but not severely scored, they may be smoothed down
with a surfacing stone If the score marks are too deep to be removed, replace camshaft.
8
Inspect camshaft gear (4) for cracking, excessive wear, cracked or broken teeth, rust, corrosion, or other
damage. If gear is excessively worn or damaged, replace camshaft (1). Minor nicks, burrs, or wear may be
smoothed out with crocus cloth.
9
Inspect spigot pin (8). Replace if damaged or worn.
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