4. ENGINE BACKFIRES.

TM-10-4930-204-13 Tank and Pump Unit Liquid Dispensing for Truck Mounting (United Manufacturing and Engineering Corp. Model Style 1) Manual
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TM 10-4930-204-13 Table 4-2. Organizational Troubleshooting (Cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3. ENGINE OVERHEATS OR KNOCKS (Cont) Step 3. Check muffler for signs of clogging. Clean or replace muffler (para. 4-24 k ). 4. ENGINE BACKFIRES. Step 1. Check for improper fuel mixture. Adjust carburetor (para. 4-24 i ). Step 2. Check intake valve for sticking. Remove spark plug (para. 4-24 e). Pour ¹/₂to 1 ounce of penetrating oil (item 6, App. F), into cylinder. Let stand 5 minutes and manually crank engine. If intake valve remains stuck, notify direct support maintenance. Replace spark plug. 5. ENGINE EXHAUST SMOKE EXCESSIVE. Check for sticking or leaking carburetor float. Replace defective carburetor (para. 4-24 i). ELECTRIC MOTOR WARNING Disconnect Intevehicle Power Cable from vehicle before main- taining replacing electrical components. 6. ELECTRIC MOTOR WILL NOT OPERATE. 4-16 Step 1. Step 2. Step 3. Change 4 Check vehicle power supply. Insure vehicle batteries and charging system. are operating properly. Check power cables. Test for continuity of Intervehicle cable and ON-OFF switch cable. Check electric motor. WARNING Disconnect Power Cable.

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