TM 5-3805-248-23-1
ENGINE, EXHAUST AND COOLING SYSTEM TROUBLESHOOTING PROCEDURES - CONTINUED
0009 00
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. Engine Knocks (Excessive
Mechanical Noise).
WARNING
DO NOT perform fuel system checks, inspections or maintenance while smok-
ing or near fire, flames or sparks. Fuel may ignite, causing damage to machine
and injury or death to personnel.
Hot oil or metal parts can cause severe burns. Wear insulated gloves, long
sleeves and eye protection when working with heated parts. Failure to follow
this warning may cause injury.
Engine has internal damage.
Replace engine assembly (WP 0257 00).
12. Excessive Noise from Valve
Mechanism (Clicking
Sound).
WARNING
DO NOT perform fuel system checks, inspections or maintenance while smok-
ing or near fire, flames or sparks. Fuel may ignite, causing damage to machine
and injury or death to personnel.
Hot oil or metal parts can cause severe burns. Wear insulated gloves, long
sleeves and eye protection when working with heated parts. Failure to follow
this warning may cause injury.
1.
Check valve clearance.
1. Adjust valves (WP 0265 00).
2. Go to Test 2.
2.
Inspect valve mechanism.
1. Replace damaged components (WP
0263 00).
2. Go to Test 3.
3.
Remove valve cover (WP 0021 00).
If there is no flow, clean and inspect valve
Check lubrication flow at valve
mechanisms (WP 0265 00).
mechanism.
4.
Check valve springs and locks.
If damage is noted, replace cylinder head
Damaged or worn locks can cause
assembly (WP 0259 00).
valve to fall into cylinder, resulting in
serious engine damage.
