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TM 5-4320-313-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. See Malfunction 1, step 4.
If vent valve is unserviceable, notify direct support maintenance
3. BLACK SMOKE FROM EXHAUST AFTER WARMUP.
Check window of air filter indicator for red band indicating blocked air filter.
If red band appears in window of air filter indicator, replace air filter element (paragraph
4-10).
4. ENGINE OVERHEATS.
CAUTION
A high temperature condition may cause abnormal engine operation.
Step 1. Check cooling air shroud for damage and dirt.
Remove accumulated dust and dirt with a wire brush (item 1, appendix E).
Step 2. Check cylinder cooling fins for damage or dirt.
Remove accumulated dust and dirt with a wire brush (item 1, appendix E).
Step 3. Check blower ring blades for damage or dirt.
Remove accumulated dust and dirt with a wire brush (item 1, appendix E).
Notify direct support maintenance of a damaged blower ring.
Step 4. Check crankcase oil levels.
Drain excessive oil from crankcase; notify direct support maintenance.
Step 5. Check muffler/spark arrestor for carbon buildup.
Service muffler/spark arrestor (paragraph 4-16).
Change 1 4-7
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