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| TROUBLESHOOTING |
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| ENGINE TROUBLESHOOTING - (TM27 Gasoline Engine Only) |
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| TROUBLE |
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| CAUSES |
| WHAT TO DO |
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| 1. | Engine fails to start | a. | Out of fuel. | a. | Fill with gasoline. |
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| b. | Clogged fuel system. | b. | Check all lines to the carburetor. |
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| c. | Choke not closing tightly. | c. | Loosen choke cable screw and slack off choke wire. |
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| d. | Ignition switch shorted or open. | d. | Replace. |
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| e. | Moisture or carbon on spark plugs. | e. | Remove plugs, clean and adjust gap. |
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| (See Engine Service Chart) |
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| f. | Defective distributor. | f. | Replace. |
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| 2. | Low oil pressure. Light not lit | a. | Oil too light. | a. | Drain; refill with proper grade. |
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| when engine is running. |
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| b. | Oil too low. | b. | Fill to “Full” mark on bayonet gage. Do not overfill. |
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| c. | Defective oil pressure switch or light. | c. | Replace. |
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| 3. | Lack of power. | a. | Carbon deposits causing | a. | Run engine under full load for a short time. |
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| b. | Incorrect timing. | b. | Time ignition. ** |
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| 4. | Overheating. | a. | No water in radiator or clogged cooling system. | a. | Check throughout for dirty or broken hoses, clogged |
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| radiator, or defective water pump. |
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| b. | Late timing. | b. | Time ignition. ** |
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| c. | Improper valve clearance. | c. | Adjust valve tappets. (See Engine Service Chart |
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| for settings). |
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| d. | Fan belt too loose. | d. | Adjust for 3/4” to 1” deflection. |
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| 5. | Knocking. | a. | Poor grade of gasoline. | a. | Use at least 87 octane gasoline. |
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| b. | Spark advanced too far. | b. | Retime ignition. ** |
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| 6. | Surging. | a. | Governor and carburetor toggles and butterfly | a. | Clean and lubricate. Replace toggles if worn. |
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| valve shaft lever are dirty and sticking. |
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| b. | Dirty air filter. | b. | Remove and clean according to instructions on unit. |
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| c. | Governor spring adjusting screw misadjusted. | c. | Adjust screw enough to eliminate surge. ** |
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| d. | Governor control rod wrong length. | d. | Adjust length of control rod so that there is from |
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| 1/32” to 1/16” clearance between the stop pin |
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| and the stop when the engine is shut off and the |
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| regulator expanded. ** |
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| ** See engine manual. |
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| CAUTION |
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If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CLASSIC III AND IIID
