3W 42i Manual
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3W 42i Manual

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ENGINE MANUAL
3W 42i
www.3w-modellmotoren.com

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Summary of Contents for 3W 42i

  • Page 1 ENGINE MANUAL 3W 42i www.3w-modellmotoren.com...

  • Page 2: Dear Customer

    3W 42i Engine Manual Dear customer, Thank you for placing your confidence in 3W. Our long experience (since 1985) in designing and producing model airplane engines, ranging from single up to six cylinder, has been utilized to provide you with the best engine possible. Our in-house engineer has been designing two and four stroke engines for gasoline and diesel for 38 years.
  • Page 3 For your safety and for the safety of those around you -- also to learn what is required to maintain your warranty - we strongly advise you to read this entire manual carefully BEFORE you start using the engine. Safe Operation and 3W's Conditional Warranty For safe operation and to maintain your warranty you must: •...

  • Page 4: Engine Installation

    3W 42i Engine Manual Engine Installation The engine should be mounted on a motor box that will in turn mount to the fuselage. A quadrilateral shape (gradually increasing in size as it goes away from the motor) provides the best circulation of air.

  • Page 5: Engine Cooling

    3W 42i Engine Manual Mount the engine to the motor box with high tensile bolts. Once mounted you now have a sub- assembly that you can mount to your fuselage. Spacers can be made from hardwood dowels (3/4" to 1") or machined aluminum bar stock to adjust your down and side thrust. These spacers should go between the motor box and fuselage and not the motor box and engine.

  • Page 6: Operating Temperature

    3W 42i Engine Manual Baffling Deflecting of the air (baffling) to and over the cylinder(s) is highly recommended for engine cooling. The idea is to get all of the cool air that is coming through the air intake opening(s) to hit the middle of the cylinder(s) directly, and then be forced over the cylinder(s), creating turbulent air moving through the cylinder(s) fins.
  • Page 7 Canister mufflers To prevent damage to the header(s) a flexible support bracket is required to mount the canister(s). The location for this bracket should be at the canister's center of gravity. 3W canisters have a reinforcement ring at this location.
  • Page 8 3W 42i Engine Manual tray. Fuel tanks, batteries, and other equipment can be mounted on top of this tray; the canister(s) being installed below it. Close off the lower compartment at its rear with an angled former. Locate this former 1" behind the back of the canister(s). Next cut a hole in the bottom of the fuselage just under the rear of the canister(s).

  • Page 9: Carburetor Settings

    3W 42i Engine Manual Carburetor settings Before each engine is shipped it has to pass QC and is then test run. We do a basic adjustment of the carburetor needles at that point. highspeed needle H: 1 1/4 low speed needle L:...

  • Page 10: Engine Break-In

    Use a high Octane unleaded fuel (98 Octane is recommended) • We use 3W 2-stroke oil in our engines here in Germany, but there are other high grade 2-stroke oils that will perform well. The list below shows some 2-stroke oils that our customers from abroad have used with success.

  • Page 11: Additional Installation Notes

    The spark plug cap must be firmly seated to the sparkplug. If the spark plug cap is not firmly seated there is a very good possibility that you will experience radio interference. • Use only ignition on/off switches recommended by 3W • 6 volts is required for the ignition.
  • Page 12 • Make sure that no gasoline will be splashed into the hot muffler(s). • Only 3W mufflers, or mufflers authorized by 3W with an acceptance (test) number, should be used. • Only 3W-ignition systems should be used for proper operation.
  • Page 13 3W 42i Engine Manual Pilots check list We strongly recommend checking the following agenda for your own safety before starting! • Check the propeller bolts for tightness • Check that the spinner is firmly attached • Check the propeller for possible damage •...

  • Page 14: Starting Procedure

    3W 42i Engine Manual Starting Procedure If you have read and understood this entire manual, and followed its recommendations, you are ready to start your new engine. • Use a rubber stick to start the engine. Never use your hand or fingers! •...

  • Page 15: Troubleshooting

    3W 42i Engine Manual Trouble Shooting Problem The engine is flooded (the crankshaft housing is filled with fuel). Solution Remove the spark plug; turn the engine to a position where the fuel runs out. The engine starts after being choked but then stops soon after.
  • Page 16 3W 42i Engine Manual Metrics Techn. Spezifikation / Techn. specifications / Caracteristiques techniques Cylinder capacity / 42,5 ccm / 2.55 cu.in Power / Puissance 4,0 HP / CV; 2.92 kW Bore dia. / Alesage 44 mm / 1.73 in Hub / Stroke / Course 28 mm / 1.10 in...
  • Page 17 / black with plug connection for red LED, long contact + yellow / white with socket connection for 3W tachometer and other options Info about red LED a) Ignition battery switched on: LED on b) Propeller one turn (flip):...
  • Page 18 3W 42i Engine Manual Garantie-Bedingungen Conditions de garantie Condiciones de la Garantía Wir geben auf unsere Geräte 36 Monate Nous donnons une garantie de 36 mois Ofrecemos una garantia de 36 ano Vollgarantie ab Verkaufsdatum. à compter de la date de vente. Cette desde la fecha de compra, que será...

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