Table of Contents
Related Manuals for Gobler-Hirthmotoren KG 3503
Summary of Contents for Gobler-Hirthmotoren KG 3503
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Page 1: Table Of Contents Germany
Operator's Manual Engine 3503 Göbler Hirthmotoren KG Max-Eyth-Str. 10 71726 Benningen Deutschland Germany Tel.: 07144/8551-0; Fax: 07144/5415 Phone:0049-7144-8551-0; Fax: 0049-7144-5415 e-mail: , Internet: info@hirth-engines.de www.hirth-engines.de... - Page 2 Operator's Manual Engine Model 3503 Read this operator's manual thoroughly before putting the engine into operation for the first time and comply strictly with the instructions given here. In the interests of continual development of our engines we must reserve the right to change conditions of delivery for design, engineering and fixtures.
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Page 3: Table Of Contents
4.3. Coolant Temperature Gauge ..............11 5. Instructions for assembling the coolant system ..........12 5.1. Operation ....................12 6. Specifications – 3503 engine ................14 Operation of the Engine ..................14 6.1. General ..................... 14 6.2. Running in - Recommendation ..............14 6.3. - Page 4 9.5. Excessive Liquid Temperature..............22 10. Exhaust System ..................... 23 10.1. Exhaust parts and measurements ............24 11. Wiring Diagrams .................... 25 11.1. Single PVL Ignition system - 3503 ............26 11.2. Dual PVL ignition system – 3503 ............27...
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Page 5: Description Of The Engine, Mounting Instructions And Technical Data
Description of the Engine, Mounting Instructions and Technical Data 1.1. Overview The 3503 engine (Figure 1.1.1-1) of Göbler-Hirthmotoren KG is a two cylinder in-line two-stroke liquid cooled engine. The cylinders consist of an aluminium alloy with a Nikasil coated running surface that is highly resistant to wear. -
Page 6: Description Of The Ignition System
Figure 1.1.2-1 (Dual Dellorto Carburation System) 1.3. Description of the Ignition System The ignition system (Figure 1.3-1, 1.3-2) consists of an armature plate, a magneto, E-Box(s), ignition coils and the ignition cables with the required number of spark plug leads. The ignition system is completely electronic and possesses an E-PROM for a freely programmable ignition curve however, this can only be carried out by the manufacturer. -
Page 7: Description Of The Cooling System
1.4. Description of the cooling system The 3503 engine has a mechanically operated liquid cooling system. (Figure 1.4-1). The liquid pump is installed above the flywheel housing. It is driven by a V belt pulley that is fixed to the ignition system’s magnetic flywheel. -
Page 8: Installation Instructions
Installation instructions 3.1. Mounting and securing the engine The six screw threads (M10) located on the underside of the 3503 engine crankcase is for fastening the engine to a suitable engine mount. Figure 2.1-1 (Fastening thread points) The engine should be mounted so that the moment from the engine to the mounts can be absorbed as widely as possible. -
Page 9: The Operation Of Dual Carburettors
Figure 2.3-1 (Fuel-diaphragm pump with impulse connection) The positioning of the fuel tank over the engine is advantageous as would ensure a reasonable fuel supply pressure. It is recommended to maintain a consistent fuel pressure under all conditions. Additional monitoring of fuel pressure by means of a fuel pressure gauge may also be considered. When installing the fuel tank beneath the engine, the maximum fuel line length between the fuel tank and diaphragm pump should not exceed 2,000mm. -
Page 10: Monitoring Apparatus
Switching off the Ignition System (dual ignition) It is essential that both ignition circuit breakers are located on separate grounding switches. It is important each earthing wire is installed separately to avoid circuit failure. This method also aids the operator to check each ignition side when the engine is operating. -
Page 11: Fuel Pressure
The EGT gauges require probes which come with 100mm of lead. To install the probe, drill a 4.763mm hole in the centre of the exhaust pipe at the recommended distance above. Install the probe into the hole, and tighten up the clamp. As an option, manifolds are provided to suit the "bayonet probe" type. The terminal cable can be lengthened to a maximum of 4.5 metres without affecting the accuracy of the instrument. -
Page 12: Instructions For Assembling The Coolant System
Figure 34.1 Westach Liquid Coolant Temperature gauge 029.36 Instructions for assembling the coolant system Compensation tank Filler cap with integrated expansion tank Reduction with throttle Thermostat Ventalation screws 5.1. Operation The pump forces the coolant into the cylinder jacket the passes into the heads. From which it flows back via the bypass through the thermostat into the coolant pump. - Page 13 • Take care to operate the engine in warmer climates with anti-freezing solution (for aluminium engines) (protection against corrosion) • The water filling cap must be filled to the brim. • In cold conditions the compensation tank must be filled about one third of coolant. •...
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Page 14: Specifications - 3503 Engine
Specifications – 3503 engine Table 4 .1 Manufacturer Göbler-Hirthmotoren KG Model 3503 Operating mode Two stroke Number of cylinders Two in line Piston Capacity 625 cm (38.1 cu in) Stroke Length 69 mm (2.72 in) Bore 76mm (2.99 in) Compression ratio 9.5:1... -
Page 15: Initial Inspection
However, it would be wise when the engine is first started, to run the motor at half throttle and load (not over 4000 rpm) for the first hour of operation. Please note, the engine has been initially run at the factory to set the electronic timing so it is possible when the engine is first started, there may be more smoke than usual. -
Page 16: Powering Down The Engine
at maximum performance). It is further recommended during operation to monitor the fuel pressure. Lack of fuel pressure will lean the fuel mixture and lead to a loss of performance and cause the engine to fail. 6.6. Powering down the engine Before the engine is switched off, it should be run for a short period at fast idling revs. -
Page 17: Maintenance Rate - Daily Inspections
Maintenance rate - Daily inspections Before operating the engine, a thorough daily inspection should be carried out. Observe the following points: Air filter - check condition and installation Starter - check condition and installation Ignition system - check condition, fastening, and connections Pump V belt - check condition and belt tension Cowling - check overall condition and the fasteners Crank case and cylinders - check for leaks overall condition of installation... -
Page 18: Maintenance Instructions - Carburettors
7.1. Maintenance instructions - Carburettors The Dellorto carburettor jets are jetted by the manufacturer so the engine is guaranteed to run thermally secure. Tampering with the jet systems of the carburettors can lead to overheating and damage to the motor and should be avoided. -
Page 19: Spark Plugs And Sparkplug Leads
Check the pulsation line between the vacuum nipple on the crankcase and the pulse connection of the fuel – diaphragm pump for leakage and/or other damage. Replace the leaking and/or damaged pulsation line. 7.8. Spark plugs and sparkplug leads It is recommended that the spark plugs be checked one after the other to avoid mixing up the sparkplug leads and their connecting positions. -
Page 20: Changing The Coolant Pump V Belt
Adjustment of the belt tension is made by undoing the upper lock nut and adjusting the belt tension by turning the lower nuts thereby moving the pump up or down. When the satisfactory tension is gained, retighten the upper locknut. Figure 10.2 Lock nut locations 8.1. -
Page 21: Trouble Shooting
Trouble Shooting 9.1. Engine does not start or is difficult to start Cause: Lack of fuel Solution: Insure fuel switch is on Insure fuel filter is clean Insure that fuel is in the tank Cause: Defective or discharged battery Solution: Replace battery Charge the battery Cause:... -
Page 22: Engine Does Not Develop Full Power
9.4. Engine does not develop full power Cause: Dirty air filter Solution: Clean or replace filter Cause: Dirty fuel filter Solution: Clean or replace the fuel filter Cause: Fuel mixture has too much oil in the gasoline Solution: Empty tank and fill with fuel of the proper mixture Cause: Incorrect adjustment of carburettors, butterfly valve not fully open Solution:... -
Page 23: Exhaust System
Detailed below are the three basic exhaust versions suitable for the 3503 engine. It is extremely important to note the distance where the diffuser is inserted into the silencer. On the 3503 engine, the distance of "I" is 0mm therefore the diffuser MUST be inserted completely into the silencer then withdrawn 0mm. -
Page 24: Exhaust Parts And Measurements
Please note, the performance specified for this engine will not be obtained if an exhaust variant is used which differs from the three basic versions. As a result from such modifications, it is possible that damage may occur to the engine. There will be no liability by Göbler-Hirthmotoren KG to provide any warranty for any malfunction or damage incurred by such modifications. -
Page 25: Wiring Diagrams
11. Wiring Diagrams The following two diagrams for the single- and dual-ignition systems show the PVL ignition system. These wiring diagrams should be understood as suggestions for the periphery of the ignition system. Cross section in general: 1.5mm² Cross section from/to Electric Starter: 16 mm²... -
Page 26: Single Pvl Ignition System - 3503
11.1. Single PVL Ignition system - 3503 Page 26 of 27... -
Page 27: Dual Pvl Ignition System - 3503
11.2. Dual PVL ignition system – 3503 Page 27 of 27...
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