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O.S. Engine MAX-70SZ-Hring Owner's Instruction Manual

Manual is about: MAX-70SZ-Hring Engine

Summary of MAX-70SZ-Hring

  • Page 1

    It is of vital importance, before attempting to operate your engine, to read the general 'safety instructions and warnings' section on pages 2-5 of this booklet and to strictly adhere to the advice contained therein. Also, please study the entire contents of this instruction manual, so as to familia...

  • Page 2: Warnings

    2 remember that your engine is not a "toy", but a highly efficient internal- combustion machine whose power is capable of harming you, or others, if it is misused. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. If at some fu...

  • Page 3: Notes

    4 notes these engine were designed for model helicopters. Do not attempt to use it for any other purpose. Mount the engine in your model securely, fol- lowing the manufacturers' recommendations, using appropriate screws and locknuts. Install an effective silencer (muffler). Frequent close exposure t...

  • Page 4

    6 notes on installing cooling fan and clutch do not use a tool which locks piston when installing a cooling-fan and clutch, or top of the piston may be damaged. Also, do not insert a screw driver or the similar into the exhaust port. It is recommended to use crankshaft clamp 7091 (code no.71530500) ...

  • Page 5

    8 basic engine parts heatsink head carburetor typr 60k crankshaft crankcase glowplug beam mount cover plate installation of the carburetor retainer screw carburetor rubber gasket 0.2mm gap loosen the retainer screw, rotate the carburetor to its correct position and press it well down into the intake...

  • Page 6

    10 before starting tools, accessories, etc. The following items are necessary for operating the engine. 1 fuel select, by practical tests, the most suitable fuel from among the best quality fuels available in your country for helicopter use. For the best throttle response, a fuel containing 10% to 3...

  • Page 7

    12 facts about glowplugs the role of the glowplug glowplug life particularly in the case of very high performance engines, glowplugs must be regarded as expendable items. With a glowplug engine, ignition is initiated by the application of a 1.5-volt power source. When the battery is disconnected, th...

  • Page 8

    14 basic position of mixture control valve (mixture control screw) thick mixture control valve mixture control screw lean as delivered, the mixture control screw is positioned at the center as shown in the sketch. Mixture gets lean when the mixture control screw is turned right, while mixture gets r...

  • Page 9

    16 in case the engine does not stop. Hold the rotor head, and pinch the fuel line to stop the fuel supply. If it still does not stop, pull off the fuel line from the carburetor. It is necessary to readjust the throttle linkage so that the carburetor rotor is fully closed when the throttle stick and ...

  • Page 10

    18 the general course of adjustment procedure is shown in the adjusting chart and is correct for a fuel containing 20% lubricant and 15-30% nitromethane. Bear in mind that fuels containing relatively large percentages of power-boosting nitromethane operate at richer mixture settings than are needed ...

  • Page 11

    20 now re-check hovering performance it may be found that (with the high-speed needle valve now set for optimum full-throttle performance) hovering will reveal symptoms of slightly lean running at medium speeds. Do not touch the high-speed needle valve. Now adjust the high-speed needle valve to achi...

  • Page 12

    22 adjusting chart high speed needle valve - 2 turns opened from fully closed position. Medium speed needle valve - 1 turns opened from fully closed position. Idle mixture control screw - 2 turns opened from fully closed position. Start the engine warm up the engine observe the mixture condition whi...

  • Page 13

    23 installation of throttle servo after the engine is installed in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor. Locate the servo so that its output arm and the throttle pushrod are, as close as possible, di- rectry in line with carbu...

  • Page 14

    25 (71608001) (71521000) (l) no.8 (71605100) a5 (72403050) (71705000) (55500003) (27708010) long socket wrench with plug grip super filter o.S. Glow plugs in-flight control needle valve lock washer m4 o.S. Genuine parts & accessories drive hub crankshaft clamp (10set) cap screw set m2.6x5 (10pcs. Se...

  • Page 15

    26 engine exploded view type of screw c...Cap screw m...Oval fillister-head screw f...Flat head screw n...Round head screw s...Set screw c.M3x15 c.M3x8 c.M2.6x20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 27 the specifications are subject to alteration for improvement without notice. Engine parts ...

  • Page 16

    28 carburetor exploded view type of screw c...Cap screw m...Oval fillister-head screw f...Flat head screw n...Round head screw s...Set screw c.M3x8 1 1-1 2 3 3-1 3-2 3-3 4 5 6 7 8 8-1 8-2 8-3 8-4 8-5 8-6 9 9-1 9-2 9-3 9-4 10 11 29 the specifications are subject to alteration for improvement without ...

  • Page 17

    30 japan japan 61 52 55.3 26 42.6 24 77.5 21.5 42 40.5 52 12.5 48 42 unf5/16-24 12.5 11.50 cc (0.702 cu.In.) 25.8 mm (1.016 in.) 22.0 mm (0.866 in.) 2,000-18,000 r.P.M. 2.5 ps / 16,000 r.P.M. 553.5 g(19.5oz.) three view drawing displacement bore stroke practical r.P.M. Power output weight specificat...