Stiga TRE 352 Workshop Manual
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Stiga TRE 352 Workshop Manual

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TRE 352
TRE 352
WORKSHOP MANUAL
WORKSHOP MANUAL
2018
Rel. 0.0
PRODUCTION YEAR
The manufacturer reserves the right to make all the necessary technical or commercial improvements to
its products, so there may be some differences between the series of engines and the contents of this
manual. However the basic specifications and different operating procedures will remain the same.
by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts
in this document may be made without explicit authorization.
IMPORTANT NOTICE : The information contained herein is intended for Service Operations and professionals
only, able to competently perform the operations described herein, using the appropriate equipment in
order to safeguard se-curity and performance of the machine. The manufacturer is not liable for damages
or injuries arising from operations performed by individuals or inadequate facilities.

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Summary of Contents for Stiga TRE 352

  • Page 1 However the basic specifications and different operating procedures will remain the same. by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts in this document may be made without explicit authorization.

  • Page 3: Table Of Contents

    << BACK >> Engine TRE 352 CONTENTS INTRODUCTION ..................... 5 1. RULES AND PROCEDURES FOR SERVICE CENTRES .......... 6 1.1. Guarantee validity ...........................6 1.2. Service repairs after guarantee period ....................6 1.3. Fault notification ............................6 1.4. Spare parts request ..........................6 2. GENERAL AND SAFETY REGULATIONS ............. 7 2.1. Qualification of operators ........................7...
  • Page 4 << BACK >> Engine TRE 352 CONTENTS 8. GOVERNOR SYSTEM OF THE CARBURETTOR ..........24 8.1. Adjusting of accelerator cable ......................24 8.2. Adjusting maximum speed ........................25 8.3. Replacing the lever support ........................26 9. IGNITION ......................27 9.1. Checking the efficiency of the ignition system ..................27 9.2. Adjusting the air gap and checking the coil ..................28 9.3.

  • Page 5: Introduction

    Centres the information necessary for a correct particularly important information, risks, warnings maintenance, dismantling and repair procedure and prescriptions: for engines motori TRE 352. Interventions on the engine must be performed in accordance with instructions in the following Warns of operations that should be carried...

  • Page 6: Rules And Procedures For Service Centres

    << BACK >> Engine TRE 352 INDEX 1. RULES AND PROCEDURES FOR SERVICE CENTRES 1.1. Guarantee validity The warranty is supplied under the terms, procedu- res and limits stated in the contract. 1.2. Service repairs after guarantee period The Service Centre must write a report for each intervention containing the serial number of the 3.1], and summary information about...

  • Page 7: General And Safety Regulations

    << BACK >> Engine TRE 352 INDEX 2. GENERAL AND SAFETY REGULATIONS 2.3. Precautions during servicing IMPORTANT: Before commencing with any As well as following the usual accident prevention intervention, carefully read the information regulations that apply to most repair shops, we...

  • Page 8: Etichette Di Sicurezza

    << BACK >> Engine TRE 352 INDEX 2. GENERAL AND SAFETY REGULATIONS 2.4. Etichette di sicurezza 3 - Ventilation of closed areas: In the event that it is necessary to start the engine On the cowl motor, in a immediately identification...

  • Page 9: Technical Data And Specifications

    << BACK >> Engine TRE 352 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.4. Expendable materials Unleaded (green) Petrol minimum 90N.O. ( I I - from 5 to 35 °C Engine oil SAE 30 - 15W-40 - from -20 to +35 °C...

  • Page 10: Tightening Torques

    << BACK >> Engine TRE 352 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.6. Tightening torques 8-12 Nm 90-100 Nm 8-10 Nm 8-12 Nm 8-12 Nm 25-32 Nm 8-12 Nm 8-12 Nm 22-26 Nm 8-12 Nm 35-40 Nm 8-12 Nm 22-26 Nm...

  • Page 11: Table Of Tightening Torques

    << BACK >> Engine TRE 352 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.7. Table of Tightening torques Chapter Ref. Description of screw Tightening torques Cowl fixing nuts 8 - 10 Nm 9 - 10 Flywheel fixing nut 90 - 100 Nm 9 - 10...

  • Page 12: Identification Of Engine Units

    << BACK >> Engine TRE 352 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.8. Identification of engine units For ease of reference, this manual has subdivided maintenance operations into different sections, each of which refers to an engine component unit as indicated in the diagrams below.

  • Page 13: Engine Tuning And Testing

    << BACK >> Engine TRE 352 INDEX 4. ENGINE TUNING AND TESTING 4.1. Operating guidelines The engine requires a series of interventions (shown in the table below) in order to ensure minimum basic maintenance. Every 25 Every 50 Every 5 hours...

  • Page 14: Functional Test

    << BACK >> Engine TRE 352 INDEX 4. ENGINE TUNING AND TESTING 4.3. Functional test A functional test needs to be carried out at the end of each servicing operation, to check that the operations made are effective. The test must be...

  • Page 15: Petrol Supply And Air Intake

    << BACK >> Engine TRE 352 INDEX 5. PETROL SUPPLY AND AIR INTAKE IMPORTANT: Carefully read the information below before commencing any intervention. General Information The petrol supply occurs via a tank mounted on the machine and connected to the carburettor by a pipe.

  • Page 16: Maintenance Of Filtering Element

    << BACK >> Engine TRE 352 INDEX 5. PETROL SUPPLY AND AIR INTAKE General information The filtering system consists of an air filter directly connected to the carburettor and an internal manifold, located between the carburettor and the cylinder head, which carries the air/petrol mix towards the intake valve.
  • Page 17 << BACK >> Engine TRE 352 INDEX 5. PETROL SUPPLY AND AIR INTAKE 4 - Touch the cartridge on a solid surface and blow with compressed air from the interior side to remove dust and product residues. IMPORTANT : For the cartridge cleaning don’t use water, petrol, detergtent.

  • Page 18: Starting System

    << BACK >> Engine TRE 352 INDEX 6. STARTING SYSTEM General information The starting system consists of the starting motor mounted on the engine casing which transmits movement to the flywheel and therefore, to the enging shaft. See the relevant section for advice on resolving problems due to the malfunctioning of the star- ting system.

  • Page 19: Replacement Of Starting Motor

    << BACK >> Engine TRE 352 INDEX 6. STARTING SYSTEM 4 - Using a screwdriver, remove the cap (6) and push on the spring in order to detach the soft sup- port (7). 5 - Move the spring clip (8) so as to allow the brush to be extracted (9).

  • Page 20: Carburation

    << BACK >> Engine TRE 352 INDEX 7. CARBURATION General information The carburettor has a float with a fixed jet and a “CHOKE” control. See the relevant section for advice on resolving problems due to carburation. The carburettor is located on the left-hand side of the engine. For maintenance operations it is necessary to dismantle the air intake filter in the sequence shown below.
  • Page 21 << BACK >> Engine TRE 352 INDEX 7. CARBURATION 4 - Remove the carburettor (7), the two gaskets (8) and the heat guard (9). 5 - Remove the tie engine shaft (10) of the accele- rator throttle lever. 6 - Remove tie engine shaft (11) of the starter throt- tle lever.

  • Page 22: Replacing The Carburettor

    << BACK >> Engine TRE 352 INDEX 7. CARBURATION 8 - Pull out the pin (15), dismount the float (16) and remove the gasket (17). 9 - Undo the main jet (18) and pull out the pilot jet (19). 10 - Check that no impurities or dirt are deposited in the seat of the needle (20) and of the jet.

  • Page 23: Adjusting Minimum Speed

    << BACK >> Engine TRE 352 INDEX 7. CARBURATION 7.3. Adjusting minimum speed 1 - Check that the throttle cable is adjusted cor- 8.1]. rectly 2 - Let the engine heat up for a few minutes, then set the throttle control to “SLOW”.

  • Page 24: Governor System Of The Carburettor

    << BACK >> Engine TRE 352 INDEX 8. GOVERNOR SYSTEM OF THE CARBURETTOR General information The carburettor governor system uses a engine shaft linkage fitted on a support fixed to the left-hand side of the engine, completed by a counterweight device, driven by the camshaft, and thus sensitive to changes in the engine’s revolution pattern depending on load.

  • Page 25: Adjusting Maximum Speed

    << BACK >> Engine TRE 352 INDEX 8. GOVERNOR SYSTEM OF THE CARBURETTOR 8.2. Adjusting maximum speed 1 - Check that the throttle cable is adjusted cor- 8.1]. rectly FAST 2 - Let the engine heat up for a few minutes then set the throttle control to “FAST”.

  • Page 26: Replacing The Lever Support

    << BACK >> Engine TRE 352 INDEX 8. GOVERNOR SYSTEM OF THE CARBURETTOR 6 - If the above checks do not show any faults, the phasing of the governor’s control lever (9) with respect to the counterweight device must be...

  • Page 27: Ignition

    << BACK >> Engine TRE 352 INDEX 9. IGNITION General information The ignition system has a flywheel with an electronic coil which supplies high voltage to the spark plug. See the relevant section for advice on resolving problems related to the ignition.

  • Page 28: Adjusting The Air Gap And Checking The Coil

    << BACK >> Engine TRE 352 INDEX 9. IGNITION 9.2. Adjusting the air gap and checking the coil 1 - Remove the cowl (6) of the engine by un- screwing the four nuts (7). 2 - By means of a pneumatic wrench, loosen the nut (8) and remove the fan (9), retaining the flywheel lock (10).

  • Page 29: Replacing The Coil

    << BACK >> Engine TRE 352 INDEX 9. IGNITION 7 - Disconnect the earth cable faston (11) of the coil (12) and reposition the fan (9) with the relative nut (8), so that the starter can be activated. 9.1]. 8 - Perform a spark test as indicated in 0,35÷0,45 mm...

  • Page 30: Engine Block - External Repairs

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 10.1. Checking the compression 1 - Remove the cap (1) and take out the spark plug (2). 2 - Manually set the piston to the TDC (Top Dead Centre) of the compression stroke so that both valves are closed.

  • Page 31: Adjusting The Valve Clearance

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs If necessary, remove the engine of the ma- chine according to indications in paragraph 11.1]. 10.2. Adjusting the valve clearance WARNING: The adjustment must be made with the engine is cold.

  • Page 32: Dismantling And Cleaning The Cylinder Head

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 10.3. Dismantling and cleaning the cylinder head 1 - Perform the operations indicated in points 1 - 2 10.2] above. - 3 in section 2 - Unscrew the screws (13) and remove the cylinder head (14).

  • Page 33: Overhauling The Cylinder Head And Valves

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 10.4 Overhauling the cylinder head and valves NOTE - These paragraphs describe all the operations for checking and overhauling the cylinder head; it is left to the operator to assess the advisabi-...
  • Page 34 << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 6 - Remove the cup-washer (17), the spring (21) and the two half-cones (20). 7 - Use an emery cloth to remove all incrustations from the valve head (22) and check the thickness of the rim (A);...
  • Page 35 << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 11 - Apply abrasive paste for grinding around the rim of the valve head (22) and then insert the valve into its seat. 12 - Use the special manually operated tool (25) to grind the seat and rim of the valve.

  • Page 36: Dismantling And Replacing The Magneto Flywheel

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs - Insert the valve and position the spring (21), the cup-washer (17) and the two half-cones (20), and follow the removal procedure in reverse using the tool (19), to lock the two half-cones into place.

  • Page 37: Checking The Oil Breather

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs Using a suitable extraction tool, remove the flywheel (31) as indicated in the diagram. Ensure that the engine shaft key is retained. 5 - Remount the coil (29) and fix the studs (30) to the indicated couple.

  • Page 38: Replacing The Upper Compression Ring Of The Engine Shaft (Flywheel Side)

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 10.7. Replacing the upper compression ring of the engine shaft (flywheel side) 10.5]. 1 - Remove the magneto flywheel 2 - Remove the screws (37) of the alternator (38) and then the bracket screw (39).

  • Page 39: Replacing The Lower Compression Ring Of The Engine Shaft (Sump Side)

    << BACK >> Engine TRE 352 INDEX 10. ENGINE BLOCK - External repairs 10.9. Replacing the lower compression ring of the engine shaft (sump side) NOTE - Before executing this operation di- scharge all the oil from the bowl and rotate 180° the motor. 1 - Take out the spline key (44).

  • Page 40: Engine Block - Overhauling Internal Parts

    << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts All the operations below require that the engine is removed from the machine. 11.1. Remove the engine from the machine 1 - Unthread the accelerator cable (1).

  • Page 41: Dismantling And Checking The Camshaft And Counterweight Governor

    << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 5 - On assembly, follow the steps described in re- verse and: - always replace the gasket (6) between cover and sump; - ensure that the two centring pins (7) are correctly inserted;...
  • Page 42 << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 6 - Check that the irregolar centrifugal (12) that are not present ruptures of the lubrification pallets. 7 - Turn the governor’s gears quickly and check that the counterweights (13) expand correctly, causing the pin (14) to be moved axially.

  • Page 43: Dismantling And Checking The Piston, Piston Rings, Connecting Rod And Engine Shaft

    << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 12 - When refitting the camshaft, maximum care must be taken to match up the two references (19) and (20) punched on the gears, so as to ensure correct distribution phasing.
  • Page 44 << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 10 - Use the special expanding tool (27) to re- move the two compression rings and the oil scraper ring from the piston (25). 11 - Carefully remove all carbon deposits from the compression rings, the inside of the cylinder and the piston head.
  • Page 45 << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 15 - Use a screwdriver to remove the clamping ring (31) and remove the gudgeon pin (32) from the piston (25). 16 - Check the diameter of the gudgeon pin (32) in several places and replace it if it is less than 19,90 mm, even at a single point.
  • Page 46 << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts C : 35,03 mm on the crank side. If the connecting rod is outside measurement tole- rances or has small scratches or marks, it is neces- sary to replace it.
  • Page 47 << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 22 - Fit the connecting rod (23), gudgeon pin (32) and clamping rings (31) to the piston (25), taking care over the connecting rod marking,which must be pointing towards the engine shaft exit.
  • Page 48 << BACK >> Engine TRE 352 INDEX 11. ENGINE BLOCK - Overhauling internal parts 26 - After having fixed the connecting rod cap, take the greatest care to ensure that the two position references (19) and (20) punched on the engine shaft and camshaft gears, coincide, ensuring the correct distribution phasing.

  • Page 49: Turning Off And Stopping Engine

    << BACK >> Engine TRE 352 INDEX 12. TURNING OFF AND STOPPING ENGINE For maintenance operations relating to this section, refer to the manual specific to the machine on which the engine is mounted. 13. EXHAUST SYSTEM For maintenance operations relating to this section, refer to the manual specific to the machine on which the engine is mounted.

  • Page 50: Troubleshooting

    << BACK >> Engine TRE 352 INDEX 14. TROUBLESHOOTING PROBLEM CAUSE SOLUTION No power supply to battery 10.8] Check alternator charge Starting motor short circuit (burnt rotor 6.2] Replace starting motor and stator) Check electrical cabling of earth wire No earth 9.1]...
  • Page 51 << BACK >> Engine TRE 352 INDEX 14. TROUBLESHOOTING PROBLEM CAUSE SOLUTION Check and/or adjust the throttle ca- The throttle cable is not well adjusted 8.1] The governor malfunctions or there is Check the entire governor system a problem with the rods...

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