Tecumseh HSK840 Technician'S Handbook Download

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This manual covers the following models:

TVS, TVXL, HXL, HSK 840 - 850

Other illustrated Tecumseh 2-Cycle Engine, 4-Cycle Engine

and Transmission manuals; booklets; and wall charts are

available through Tecumseh.

For complete listing write or call

T E C H N I C I A N ' S H A N D B O O K

TECUMSEH

HSK/HXL840 - 850

TVS/TVXL840

2-Cycle Engines

www.mymowerparts.com

For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983

Summary of Contents for HSK840

Page 1: ...Cycle Engine and Transmission manuals booklets and wall charts are available through Tecumseh For complete listing write or call T E C H N I C I A N S H A N D B O O K TECUMSEH HSK HXL840 850 TVS TVXL8...

Page 2: ...FINAL ADJUSTMENTS 11 TROUBLESHOOTING CARBURETION SERIES I TABLE OF PROBLEMS AND CORRECTIONS 12 PISTON AND RINGS 840 850 MODELS 13 E G R TUBE SERVICE AND INSTALLATION TVS TVXL 840 ONLY PORT PLUG REINS...

Page 3: ...be used for proper fuel and oil mix ratio FUEL MIX CHART Mixture 50 1 U S S I METRIC Gas Oil To Be Added Petrol Oil To Be Added 1 Gal 2 1 2 oz 4 Liters 80 ml 2 Gal 5 oz 8 Liters 160 ml 5 Gal 13 oz 20...

Page 4: ...tank to prevent gum deposits from forming in tank and other fuel system components causing possible malfunction of the engine DRAIN FUEL INTO APPROVED CONTAINER OUTDOORS AWAY FROM OPEN FLAMES Run engi...

Page 5: ...his procedure it should be replaced with a new screen NOTE Polyurethane type filters will lose effectiveness if stored for extended periods of time due to oil migration out of the filter Re oil filter...

Page 6: ...spent gases out through the open exhaust ports TERMS Listed are common terms often referred to on 2 cycle engines EXHAUST or SCAVENGE PHASE The burned gases must be cleared out of the combustion cham...

Page 7: ...Series I carburetor Fixed speed models have no idle circuit with a fixed main jet Variable speed engines use a full circuit Series I which has an idle fuel circuit as shown above SERIES VI OPERATION T...

Page 8: ...N Do not exceed equipment manufacturers recommended RPM Excessive RPM will cause the carburetor fuel mixture to lean out and the engine may overheat and eventually fail At Idle or Low Load running the...

Page 9: ...tor All passages may be probed with soft tag wire and blown out with compressed air to open plugged or restricted passages REBUILDING THE CARBURETOR Place the inlet needle and spring clip onto the flo...

Page 10: ...is a left handed bowl nut POINTS TOWARD THE CHOKE END SCRIBE MARK AT THE 12 O CLOCK LOCATION FLOAT INLET NEEDLE AND SEAT ADJUSTING TAB FLOAT HINGE AND AXLE All Tecumseh carburetors with an adjustable...

Page 11: ...ired 4 Dirt or restriction in fuel system clean tank and fuel strainers and filter check for kinks or sharp bends 5 Check for stale fuel or water in fuel fill with fresh fuel oil mixture of correct ra...

Page 12: ...e point Drive the chisel into the welch plug push down on chisel and pry plug out of position NOTE Snow KIng engines have a primer tube on the carburetor Make sure this passage is open and replace the...

Page 13: ...e carburetor can now be adjusted Final Adjustments Start the engine and allow it to warm up to normal operating temperature 3 5 minutes Set the speed control to the HIGH or FAST position then turn the...

Page 14: ...3 14 15 18 19 Idle speed is excessive 8 9 13 14 15 18 19 Choke does not open fully 8 9 14 15 Engine starves for fuel at high speed leans out 1 3 4 5 6 10 11 15 16 17 18 20 Carburetor runs rich with ma...

Page 15: ...laced in either ring groove of the piston Some 840 850 models use a half keystone upper ring The ring groove in the piston and on the ring have a distinctive taper to them The ring must be placed in t...

Page 16: ...u have no air leaks Allow epoxy to cure for 24 hours before using engine Install the E G R tube in to the proper depth by using service tool number 670318 PORT PLUG REINSTALLATION The large transfer p...

Page 17: ...l not to bend or poke a hole in the screen 4 With the screen in place take a 1 4 roll pin punch place it on top of the screen and tap until the screen is seated securely in the hole 5 Reassemble the e...

Page 18: ...n the brake pad lever REASSEMBLY OF THE BRAKE SYSTEM 1 Position brake spring on brake pad lever with small extension of spring into notch on pad arm 2 Assemble the brake pad lever and spring assembly...

Page 19: ...Tighten both pivot screws and remove alignment punch CAUTION Secure the screws with red Loctite DO NOT over torque or the brake pad will be distorted Then a new pad and lever assembly will be require...

Page 20: ...oming loose This is the same screw that is used on the choke and throttle plates in the carburetor GOVERNOR SHAFT SEAL The governor shaft seal may be pressed in until it seats in the boss of the block...

Page 21: ...ADJUSTMENT INCREASE DECREASE The HXL840 850 Series with variable speed control have the following adjustments Idle speed is set at the carburetor crack screw High speed is set with the screw shown abo...

Page 22: ...with the new center pin 3 Check retainer pawl If it is worn bent or damaged in any manner replace upon reassembly Tap the new center pin in until it is within 1 8 of an inch of the top of the starter...

Page 23: ...he piston in the Bottom Dead Center position Then clean the ports using a pointed 3 8 diameter wooden dowel or similar tool Be sure not to scratch the port area Also remember to remove all the loose c...

Page 24: ...ing the flywheel nut On TVS TVXL Models before removing the flywheel the brake pad must be disengaged from the inside of the flywheel If this is not done damage could occur to the brake system To dise...

Page 25: ...may be necessary to tap lightly on the ring with a rawhide mallet to remove it On TVS TVXL840 models remove the 3 screws that hold the speed control to the block Remove governor linkage on HXL model...

Page 26: ...the intake elbow out of it s cavity Discard the rubber O rings Examine the reed valve for damage and wear If reed clearance is 020 or more replace the intake elbow BRAKE CONTROL LEVER CONTROL LINK BR...

Page 27: ...u don t drop any of the needle bearing needles follow these steps First rotate the piston towards the spark plug Next hold the rod against the crankshaft counter weight and pull the assembly out GOVER...

Page 28: ...65 when positioning the oil seal Reposition the ball bearing and oil seal on the flywheel end of the crankshaft TOWARD PTO END OF CRANKSHAFT GOVERNOR SLIDE RING GOVERNOR FLYWEIGHT BALLS BALL BEARING O...

Page 29: ...ston assembly into the cylinder Make sure to stagger the ring end gaps The tapered edge of the cylinder will compress the rings Use care not to damage the connecting rod GOVERNOR SLIDE RING GOVERNOR F...

Page 30: ...the rubber O rings on the intake elbow with the proper replacement parts NOTE TO PREVENT O RING DAMAGE ALWAYS LUBRICATE THEM WITH OIL ON ASSEMBLY Assemble the brake assembly as shown Only on TVS TVXL...

Page 31: ...er so it catches on the shroud Reposition the flywheel key starter cup washer and flywheel nut Hold the flywheel with the strap wrench 670305 and torque the flywheel nut to specifications Reattach the...

Page 32: ...gine was rebuilt use double the mixture of oil for the first gallon of fuel Install the correct spark plug and reconnect the high tension lead NOTE On Snow King models the fuel tank is supplied by the...

Page 33: ...NER CANISTER HEX NUT 14 20 1 6 2 2 STUD to AIR CLEANER ELBOW 36 60 4 0 6 7 AIR CLEANER ELBOW to CARBURETOR 20 30 2 2 3 4 AIR CLEANER WING NUT 10 20 1 1 2 2 AIR CLEANER PLASTIC to CARBURETOR 6 8 7 9 AI...

Page 34: ...45 1 64 mm 0655 1 66 mm 0655 1 66 mm 0655 1 66 mm TOP 0615 1 56 mm Half Half 0625 1 59 mm Keystone Keystone Ring Ring PISTON RING WIDTH BOTTOM 0615 1 56 mm 0615 1 56 mm 0615 1 56 mm 0625 1 59 mm 0625...

Page 35: ...TROUBLESHOOTING BOOKLET 693505A This booklet contains schematic drawings of Tecumseh direct current and alternating current systems and how to check them when problems occur This booklet is designed a...

Page 36: ...Tecumseh under the part number 510334 TORX DRIVERS Torx 8 670334 Torx 10 670333 Torx 15 670323 Torx 20 670324 Torx 25 670319 Torx 30 670320 TOOLS TOOL KIT 670195B Kit contains tools for 2 and 4 cycle...

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