10
Four Cycle Troubleshooting
The following is provided as a basic troubleshooting guide. Its use requires a complete review of all conditions
and symptoms. Always examine the exterior for clues: leaks, excessive dirt, or obvious damage. Some repairs will
require the assistance of a Tecumseh Servicing Dealer.
Should more extensive repair be needed, we recommend you contact a local Tecumseh Servicing Dealer for repair.
Repair manuals are also available from your local dealer or direct from Tecumseh. A complete list of the available
manuals can be found at the end of this book.
NOTE: Refer to Technician's Handbook for a more detailed list of remedies.
Preparation
Before troubleshooting any system problem, see original equipment manufacturer’s (O.E.M.) instructions.
Make your troubleshooting easier by preparing as follows:
• Work in a clean, well-lighted place.
• Keep proper tools and materials nearby.
• Keep an adequate supply of clean petroleum-based solvent.
To reduce the risk of serious injury or death from fires and/or explosions, NEVER use flammable
solvents (e.g., gasoline) to clean serviceable parts. Use a water-based, non-flammable solvent
such as Tecumseh Degreaser Cleaner.
NEVER use compressed air to clean debris from yourself or your clothing. When using compressed
air to clean or dry serviceable parts:
• Wear appropriate eye protection.
• Use only approved air blow nozzles.
CAUTION
FUEL SYSTEM
Engine Will Not Start
Check if spark plug is wet or
dry
W
et Dry
Defective spark plug
Use Tester 670366
Review with the customer proper
priming procedure (3-5 primes,
waiting 2 seconds between each
prime)
Restricted air filter
If equipped with a choke, check for full
travel. Check throttle cable and control
for proper adjustment.
Improper or stale fuel Check fuel supply and fuel cap vent
Exhaust ports plugged Restriction in fuel system (filter)
Carburetion problems due to fl
ooding,
over priming, etc.*
Carburetion problem*
(bad bowl gasket)
Ignition System Poor Compression
• Air pressure must not exceed 30psi (206kPa).
• Shield yourself and bystanders from flying debris.
another free manual from www.searstractormanuals.com
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