Tecumseh TC Series User Manual

27
TESTING
ENGINE KNOCKS
1. Check the blade hub, adapter, crankshaft coupler or associated equipment for loose fit, loose bolts, or crankshaft
key or adapter damage. Re-install and re-torque the bolts to the proper torque.
2. Check the flywheel key and the flywheel and crankshaft keyway for wear or partial shearing. Replace if any damage
is evident. Tighten the flywheel nut to the proper torque.
3. Check for the correct ignition module air gap. See Chapter 6 under "Service".
4. Remove the muffler and check for carbon build-up in the combustion chamber and exhaust port. Check the spark
plug for the proper reach and heat range (correct spark plug for the engine). Clean carbon build-up if necessary.
5. Check the internal components (piston, cylinder, connecting rod, and crankshaft journal) for excessive clearance
using a dial bore gauge, micrometer, and telescopic gauges.
ENGINE OVERHEATS
1. Make sure the engine is not being overloaded. Remove excess load (sharpen blades, limit operation speed, or
process less material).
2. Make sure the fuel mixture contains the correct ratio of certified 2-cycle oil to gasoline. Replace the fuel supply if
questionable.
3. Check for clogged cooling fins or obstructions to the air flow. Remove the rewind assembly, clean and reinstall.
4. Check the engine R.P.M. setting using a vibratach or other tachometer and compare it to the R.P.M. settings found
on microfiche card # 30 or computer parts lookup according to the engine model and specification number. Adjust
as necessary.
5. Remove the muffler and check for carbon build-up in the combustion chamber and exhaust port. Clean as necessary.
6. Check the carburetor for the correct idle mixture adjustment. Clean the carburetor if the problem persists see Chapter
3 under "Service".
7. Check for the correct ignition module air gap. See Chapter 6 under "Service".
8. Inspect the intake gaskets, crankcase seals or gaskets for a leaking condition. Use a commercially available crankcase
pressure tester and follow the tester's recommended test procedure. See "Disassembly Procedure " in this chapter
for component removal.
SURGES OR RUNS UNEVENLY
1. Check the fuel cap to make sure it is venting. Loosen the cap and retry engine operation.
2. Replace or clean the air filter if applicable.
3. Check the carburetor for the correct idle mixture adjustment. Clean the carburetor if the problem persists see Chapter
3 under "Service".
4. Check the engine R.P.M. setting using a vibratach or other tachometer and compare it to the R.P.M. settings found
on microfiche card # 30 or computer parts lookup according to the engine model and specification number. Adjust
as necessary.
5. Visually check all linkages. Check the governor spring for a stretched or damaged condition. Check the governor
shaft, throttle shaft, and pivot points for binding.
6. Check the ignition module operation using a gap type tester inserted in the high tension lead. Check for intermittent
spark.
7. Inspect the intake gaskets, crankcase seals or gaskets for a leaking condition. Use a commercially available crankcase
pressure tester and follow the tester's recommended test procedure. See "Disassembly Procedure " in this chapter
for component removal.
ENGINE MISFIRES
1. Check the spark plug for a fouled condition. Replace if questionable.
2. Check the carburetor for the proper adjustments. See "Pre-sets and Adjustments" in this chapter.
3. Check the air gap dimension. Follow the procedure in Chapter 6 under "Service". Use an in-line spark tester to see
if the problem is ignition related.
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Tecumseh TC Series Specifications

General

Brand	Tecumseh
Model	TC Series
Category	Engine
Language	English