Hirth F-23 Operator's Manual
  1. Manuals
  2. Brands
  3. Hirth Manuals
  4. Engine
  5. F-23
  6. Operator's manual

Hirth F-23 Operator's Manual

Hide thumbs

Advertisement

Table of Contents

HIRTH OPERATOR'S MANUAL
F-23 engine
IMPORTANT: THIS MANUAL CONTAINS IMPORTANT
SAFETY AND MAINTENANCE INFORMATION CONCERNING
YOUR ENGINE. IT MUST BE READ THROUGH IN ITS
ENTIRETY AND COMPLIED WITH WHERE APPLICABLE
IMMEDIATELY UPON RECEIPT OF ENGINE, EVEN IF THE
ENGINE WILL NOT BE USED IMMEDIATELY. THIS MANUAL
MUST STAY WITH THE ENGINE AT THE TIME OF RESALE.
Hirth Motoren and related agents reserve the right to make changes, additions,
deletions, and supercessions to this manual without notice.

Advertisement

Table of Contents
loading

Related Manuals for Hirth F-23

Summary of Contents for Hirth F-23

  • Page 1 IMMEDIATELY UPON RECEIPT OF ENGINE, EVEN IF THE ENGINE WILL NOT BE USED IMMEDIATELY. THIS MANUAL MUST STAY WITH THE ENGINE AT THE TIME OF RESALE. Hirth Motoren and related agents reserve the right to make changes, additions, deletions, and supercessions to this manual without notice.
  • Page 2 INDEX Break-In Page 5 Gasoline and Oil Page 8 Engine checks Page 9 Starting procedure Page 10-11 Run up procedure Page 11-12 Engine Shutdown Page 13 Belt reduction drive Page 14 Gearbox/Recoil Starter Page 15 Fuel System Page 17-18 Carburetor Info Page 19 Problem solving Page 19-21...
  • Page 3 Congratulations on your purchase of a new Hirth engine! If properly installed and maintained, you should receive many years of reliable service from the engine. Description: The engine F-23 of Hirth Motoren GmbH & Co. KG is an air-cooled, Piston port-controlled opposed two-cylinder 2-stroke-engine. The cylinder consists of an aluminium alloy with wear-resistant tread alloy.
  • Page 4 WARNING This engine is not a certified aircraft engine. It does not conform to any aircraft standards and it has not undergone safety or durability testing for any type of aircraft certification. It is an experimental aircraft engine for use in experimental aircraft and should always be treated as such.
  • Page 5 The Hirth engine is, of course, a piece of machinery. As with any piece of machinery, parts will eventually wear and/or fail. It is very important to do regular maintenance and inspections on your engine, inspecting, adjusting, repairing and/or replacing the parts as required.
  • Page 6 BREAK IN READ SECTION THOROUGHLY BEFORE PROCEEDING WITH BREAK IN. It is recommended that the first hours of operation should only be performed with the help of someone with good experience in the operation of two cycle engines mounted in experimental aircraft.
  • Page 7 …BREAK IN CONTINUED During break in, carburetor setting should be completed. Max allowable CHT - 535 F. Max allowable EGT – 1256 F at full power. Max EGT in mid range – 1330 F. Engines should be jetted to run at approximately 100 to 150 degrees EGT below maximum Run-in engine easily for the first two hours.
  • Page 8 INSPECTIONS Safety is top priority! If you keep your engine in top condition you will greatly reduce the risk of having an engine failure. If you continually check all systems you will know your engine much better and therefore be able to recognize any potential problems much easier. Do not overlook a single point! Check all points and aspects for wear, condition, operation, security, leaks and serviceability.

  • Page 9: Gasoline And Oil

    If fuel injected mix at 45:1 100:1 Ratio oils: Blue Max is the only 100:1 oil that has been tested and approved by Hirth. If you elect to use Blue Max it should be mixed at 90:l. Do not use Blue Max at ratios lower than 90:1.
  • Page 10 Check that the ignition switch is off. Check carburetor rubber flange for cracks, signs of wear, etc. Check carb for secure attachment. Check carburetors for proper tuning and adjustment, as required for climatic changes such as temperature, pressure, field altitude, etc. Drain a small quantity of fuel from fuel tank(s) sump.

  • Page 11: Pre-Start Check

    PREPARING TO START ENGINE FOR THE FIRST TIME Read the Operating and Maintenance instructions completely and comply where applicable. Ensure that the installation is complete. Ensure that all systems are ready and functional. Make sure that the operator has spent some time getting acquainted with the cockpit and can properly operate the engine controls by instinctive reaction.

  • Page 12: Starting A Hot Engine

    11. Increase throttle setting to increase engine RPM to approximately 2500 RPM. Allow engine to run for a few minutes at this setting. 12. Maneuver to a proper run-up area and complete engine run-up. Refer to Run-up Procedure. Note: If engine will not start after 3-4 attempts, check the spark plugs. Refer to section dealing with Trouble-Shooting.
  • Page 13 RUN UP PROCEDURE PART “2” Upon completion of Run-up #1, move the throttle setting to maximum and observe: a. Maximum static RPM to be approximately 85% -95% of 100% BHP. b. Cylinder head temperature is in range. See temperature chart. c.

  • Page 14: Adjusting Procedure

    STARTING DEVICES Starting with electric starter Operate starter switch or starter button. Do not engage for more than 5 seconds. If it doesn’t start within that time, let it cool before another attempt is made. Starting with recoil Starter Hold the handle of the recoil starter with one hand. Brace the engine (or appropriate) with the other hand.

  • Page 15: Recoil Starter

    With tension still on the starter handle, tighten the three M6 Allen screws. Release handle. Remove crankshaft restricting device. Pull through a few times and ensure a smooth rewind. More in-depth servicing of the recoil starter is best left to a Hirth Service mechanic.
  • Page 16 INSTRUMENTATION There are many engine monitoring instruments available for your Hirth engine. Of course, it is good if you can have all of them available to you. However, weight and/or space limitations may not allow all of them. The following instruments are minimally required to properly...
  • Page 17 Note: 1 inch = 25.4 millimeters.
  • Page 18 FUEL SYSTEM NOTES When mounting fuel pump, mount it slightly above engine impulse nipple, in order that any residual oil will drain back into the engine. When mounting fuel pump, do not mount it solid to the engine, but rather, mount it on a bracket which is attached to the airframe or part of the engine mount beyond the rubber dampener on the airframe side, to avoid vibrations.

  • Page 19: Carburetor Setting

    Although jet changes may be required, these changes should not be conducted unless proper Hirth tuning information is on hand and the changes are made by a qualified person. Hirth uses different brands of carburetors throughout its engine line.

  • Page 20: Hard Starting

    PROBLEM POSSIBLE CAUSE CORRECTION HARD STARTING Incorrect use of choke Correct use of choke Incorrect air/fuel mixture adjustment Set adjustment screw Incorrect use of throttle setting. See table of data and adjustments Restricted fuel filter Replace filter Restricted low speed jet(s) Disassemble carb and clean Restricted vent hole in fuel cap...
  • Page 21 Air screw out of adjustment Adjust correctly Incorrect idle jet size. Replace with correct idle jet IDLE AIR SCREW IS INEFFECTIVE, DOES NOT RESPOND TO ADJUSTMENT Idle speed set too high Adjust idle speed Refer to table of data & adjustments Clogged idle jet or air screw Disassemble carb &...
  • Page 22 Connecting both stop circuits to a single pole switch will damage the ignition system. Hirth PVL ignition has a Rev limiter built in. Engine will not turn faster than 7000 RPM. This can save expensive engine repairs in the case of sheared prop bolts at full power.
  • Page 24 The previous page gives some ideas for shrouding free air engines. Note the different angles of the cylinder head fins. As Hirth utilizes a symmetrical 8 bolt pattern, it is possible to orient the head fins in several different configurations on 2702, 2703, F23 and F30 models.

  • Page 25: Cleaning The Engine

    EXHAUST SYSTEM: Inspect and apply maintenance as per maintenance schedule. Never modify your Hirth exhaust system except as per guidelines in Hirth installation instructions. It has been specifically designed for the purpose in which it will be used. Changes to the system will affect reliability, performance, engine temperatures, fuel economy and engine life, warranty, etc.
  • Page 26 16mm 107Ft.Lbs ENGINE MOUNTING BOLTS 10nn 37Ft.Lbs. 444 inch Lbs. HIRTH ENGINE SETTING VALUES Engine F-23 VM slide carb F-23 BN carb F-23 E (Fuel Inj) Ign.Timing@2000 - carbureted 16 deg. 16 deg. Ign.Timing@2000 - Fuel injected 18 deg. Spark Plug Heat Vl.
  • Page 27 MAINTENANCE INTERVALS (STATED HRS) replace oil in gearbox re-torque gearbox bolts check oil level in gearbox check centrifugal clutch for wear check dampner in gearbox for wear re-torque all external fasteners,(nut,bol t,screw,etc) remove exhaust manifold and check for carbon build up on piston rings clean spark plugs replace spark...
  • Page 28 Maintenance Intervals in hrs. replace carbon brushes of electric starter check starter gear of engine for wear check fuel filter replace fuel filter clean air filter(oil if applicable) replace air filter check carburetors &readjust if necessary rebuild carbs clean carbs & check for leaks check carb jet needle for wear,...
  • Page 29 Maintenance Intervals in hrs. check cylinder bore for scratches lubricate exhaust ball joints replace exhaust springs replace gaskets if leaking or removed replace ignition replace spark plug wires replace multi- grooved belt on reduction drive replace 5-v-belts on re-drive disassemble, inspect &...

  • Page 30: Troubleshooting

    The Hirth engine is actually very simple in its design. It basically requires two necessities to run. Spark and fuel/air mixture. The majority of problems are usually lack of spark, or lack or abundance of fuel and/or air.
  • Page 31 SPARK Basically, you either have it or you don’t. If you don’t have spark, then WHY? Let’s say that there is spark on one set of ignition only. Check for a bad connection, broken or disconnected wires. Try the spark plugs that do work. Exchange the ignition wires that originate from the ignition module at the point of the coils.
  • Page 32 the same indicator goes high then the problem is in the instrument or EGT sensor and engine is fine. Example #3. Let’s say CHT & EGT are hot on both cylinders. This will usually indicate a lean situation. As the problem is common to both cylinders, it would be usual that the problem is with a part of the system that is common to both cylinders.
  • Page 33 ENGINE MAINTENANCE AND REPAIR LOG DATE EXPLANATION OF WORK COMPLETED: Record the specifics of your engine here. This information may be needed when calling for tech support and parts.
  • Page 34 Engine model number ____________________ Engine horsepower _______________ Engine serial number. ____________________ Date of purchase. ____________________ Place of purchase. ____________________ PSRU - Type/Ratio. ____________________ PRSU = Propeller speed reduction unit. Number of carburetors _____ Type of carburetor _________________ Application – Type of vehicle ______________ Tractor or pusher prop_____________...

Table of Contents