TABLE OF CONTENTS
Page
ENGINE IDENTIFICATION AND CARE
IDENTIFICATION ................................................................................................................................... 1
INTERPRETATION OF MODEL NUMBER ............................................................................................ 1
FUELS .................................................................................................................................................... 1
ENGINE OIL ........................................................................................................................................... 1
FUEL/OIL MIX ......................................................................................................................................... 1
STORAGE .............................................................................................................................................. 2
TUNE-UP PROCEDURE ........................................................................................................................ 2
EXHAUST PORT CLEANING................................................................................................................. 2
AIR CLEANER
AIR CLEANER .................................................................................................................... .................... 3
POLYURETHANE-TYPE AIR CLEANER ............................................................................................... 3
PAPER TYPE AIR CLEANER ......................................................................................................... ....... 3
KLEEN-AIRE
®
CANISTER STYLE DUEL STAGE AIR CLEANER ......................................................... 3
2 CYCLE THEORY OF OPERATION
OPERATION OF HSK, HXL840-850 MODELS ...................................................................................... 4
OPERATION OF TVS, TVXL840 ............................................................................................................ 4
TERMS ................................................................................................................................................... 4
EXHAUST OR SCAVENGE PHASE ...................................................................................................... 4
PORTS .................................................................................................................................................... 4
LUBRICATION ........................................................................................................................................ 4
REED VALVE ......................................................................................................................................... 4
CARBURETION
C
ARBURETOR IDENTIFICATION ....................................................................................................... .. 5
SERIES I OPERATION........................................................................................................................... 5
SERIES VI OPERATION ........................................................................................................................ 5 - 6
SERVICING THE CARBURETOR - SERIES VI
REBUILDING THE CARBURETOR...................................................................................................... .. 7 - 8
TROUBLESHOOTING CARBURETION SERIES VI
TABLE OF PROBLEMS AND CORRECTIONS ..................................................................................... 9
SERVICING THE CARBURETOR - SERIES I
SERVICE ........................................................................................................................ ........................ 10
SERVICE CARBURETOR PRE-SETS AND ADJUSTMENTS
PRE-SETS AND ADJUSTMENTS ....................................................................................................... ... 11
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 REINSTALLATION....................................................................................................... ..... 14
ANTI-PUDDLING METER HOLE SCREEN
REPLACEMENT OF SCREEN ............................................................................................................... 15
SELF-ENERGIZING BRAKE SYSTEM
DISASSEMBLY OF THE BRAKE SYSTEM ........................................................................................... 16
REASSEMBLY OF THE BRAKE SYSTEM ............................................................................................ 16 - 17
GOVERNOR LINKAGE AND ADJUSTMENT
LINKAGE LOCATION ............................................................................................................................. 18
GOVERNOR ADJUSTMENT .................................................................................................................. 18
GOVERNOR FOLLOWER ARM AND SHAFT ASSEMBLY ................................................................... 18
GOVERNOR LINKAGE AND ADJUSTMENT - HXL/HSK840 - 850
CONTROLS ............................................................................................................................................ 19
REWIND STARTER
TYPE I ..................................................................................................................................................... 20
TYPE II .................................................................................................................................................... 20
840 - 850 DISASSEMBLY
MODEL 840-850 DISASSEMBLY .......................................................................................................... 21
EXHAUST PORT CLEANING................................................................................................................. 22 - 25
TVS & TVXL 840 REASSEMBLY
840 HORIZONTAL AND VERTICAL REASSEMBLY ............................................................................. 26 - 30
TORQUE SPECIFICATIONS
TORQUE LIMITS FOR REASSEMBLY .................................................................................................. 31
ENGINE SPECIFICATIONS
TOLERANCES IN THE ENGINES...................................................................................................... .... 32
TRAINING AIDS AND TOOLS
LISTING OF SPECIAL TRAINING AIDS AND TOOLS .......................................................................... 33 - 34
C Tecumseh Products Company
1996
www.mymowerparts.com
For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
