Tecumseh Parts    |    Tecumseh Parts Lookup    |    Tecumseh Repair Manuals SERVICE BULLETIN 109 INFORMATIONAL For the most part, engine neglect in some customers’ eyes is non-existent when major engine repairs have to be made and paid for. It is a necessity to convince the customer that poor maintenance and neglect are the reasons for his problems and that they could have been prevented. Sometimes just showing the customer what you call common conditions, such as, scoring or discoloration of parts, does not seem very dramatic at this point. The customer wants to see something he understands, something simple yet something more convincing. Using a magnet to check for metal transfer caused primarily by dirt particles going through the engine is a simple and convincing test to show neglect due to poor owner maintenance. Remove some carbon deposits from the cylinder head or spark plug and place these deposits on a piece of paper. By moving a magnet around un

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The following procedures apply to spark plugs for small engine equipment, automotive and other applications using internal combustion engines. 1) Visually inspect the spark plug for any damage or excessive wear. 2) Remove carbon or other deposits with a stiff wire brush. 3) Measure the plug gap with a wire-type or slim type feeler gauge. If necessary, adjust the gap to plug manufacture specifications by bending the side electrode. 4) Make sure the sealing washer is in good condition; place the plug if damaged. 5) Install the plug finger tight to seat the washer correctly, then tighten with a spark plug wrench to compress the sealing washer.  NOTE: Tighten additional 1/2 turn if installing a new spark plug.        Tighten additional 1/8 to 1/4 turn if you are reusing the spark plug. Take Caution! Spark plugs must be securely tightened. An improperly tightened plug can become very hot and possibly damage the engine. Never use a spark plug with an improper heat range rating.