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TECUMSEH
T E C H N I C I A N ' S
H A N D B O O K
This manual covers VLV40 - 675.
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
VLV
(VECTOR)
4-CYCLE
ENGINES
Not For Resale
www.SmallEngineDiscount.com
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Table of Contents
Troubleshooting
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Summary of Contents for Tecumseh VLV
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Page 1: Not For Resale
T E C H N I C I A N ' S H A N D B O O K This manual covers VLV40 - 675. Other illustrated Tecumseh 2-Cycle Engine, 4-Cycle Engine and Transmission manuals; booklets; and wall charts are available through Tecumseh. -
Page 2: Table Of Contents
TABLE OF CONTENTS Chapter 1 General Information ................1 Engine Identification ................... 1 Engine Breakdown ....................2 Parts List ......................3 Engine Care ......................4 Fuel, Oils, Storage ....................4 Tune-Up Procedure .................... 5 4-Cycle Engine Theory ..................6 Chapter 2 Air Cleaners ..................... - Page 3 Chapter 13 Troubleshooting ................... 33-39 Chapter 14 Engine Specifications ..................40 Torque Specifications ..................41 Chapter 15 Training Aids and Tools ..................42 Chapter 16 Sears Craftsman Cross Reference ..............45 Tecumseh Products Company C 1996 Not For Resale www.SmallEngineDiscount.com...
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Page 4: Chapter 1 General Information
Chapter 1 GENERAL INFORMATION ENGINE IDENTIFICATION Tecumseh engine model, specification and serial numbers are stamped or decaled on the blower housing. The decal also contains any emission compliance information. The letters which precede the model numbers indicate the basic type of engine:... -
Page 5: Engine Breakdown
OPTIONAL PRE-FILTER PARTS IDENTIFICATION This is a parts breakdown of a typical VLV engine. Use this parts SBV-XXX SER-XXX breakdown to identify parts. When ordering parts always refer to the engine model and specification number stamped on the engine blower housing. -
Page 6: Parts List
Ref. Ref. Part Name Part Name Cap, Valve spring Cylinder Assy. Gasket, Valve cover Pin, Dowel Cover, Valve spring box Element, Breather Screw, 10-24 x 1/2 Cover, Breather Stud, Carburetor mounting Gasket, Breather cover Link, Governor Screw, Thread forming, 10-24 x 1/2 Spacer, Carburetor mounting gasket Body, Breather valve Lever Assy., Brake... -
Page 7: Engine Care
USE A CLEAN, HIGH QUALITY DETERGENT OIL. Be NOTE: VLV engines are equipped with a bowl drain sure original container is marked: A.P.I. service “SF” or screw. See Chapter 2 for removal procedure. -
Page 8: Tune-Up Procedure
4. Make sure fuel tank, fuel filters and fuel lines are clean. Replace any worn or damaged governor springs or linkage. Make proper governor adjustments where required. (See Chapter 3) NOTE: If the engine is equipped with a Tecumseh fuel tank, an integral filter is molded inside. STANDARD PLUG 5. -
Page 9: 4-Cycle Engine Theory
4-CYCLE ENGINE THEORY Tecumseh four-cycle engines require four strokes or 3. POWER. Both valves remain closed. As the piston cycles to complete one power cycle. reaches the Before Top Dead Center (BTDC) ignition point, the spark plug fires, igniting the fuel-air mixture. -
Page 10: Chapter 2 Air Cleaners
Chapter 2 AIR CLEANERS CAUTION: Before removing air cleaner, make sure ALL POLYURETHANE-TYPE PRE-FILTERS. These excess dirt is removed from around it. serviceable air filters utilize a polyurethane element which will clog up with use. The element should be NOTE: If the engine is equipped with an optional poly cleaned and serviced in the following manner. - Page 11 TO SERVICE AIR CLEANER 1. Loosen cover screw (A). 2. Swing cover down and remove from hinge (B). PRE-FILTER 3. Pull foam pre-filter out of air cleaner body (if equipped with pre-filter). 4. Pull air filter out of air cleaner body. 5.
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Page 12: Carburetion
Carburetor Identification: Tecumseh carburetors are identified by a manufacturing number and date code stamped on the carburetor as TORX E-5 shown. When servicing carburetors, use the engine... -
Page 13: Float Bowl Service
The carburetor is a float feed, nonadjustable type, with a 1 piece extruded aluminum body. The float bowl, float, nozzle, and venturi are nonmetallic, minimizing the corrosion and varnishing problems. Common service areas of the carburetor are contained "O" RING in the fuel bowl. -
Page 14: Float Bowl Reassembly
Place a new gasket on top of the float bowl with the notch on the gasket aligned with the bump on the bowl edge (the gasket will only fit onto the float bowl one way.) Hold the float bowl to the carburetor body and 5/32"... -
Page 15: Throttle Shaft & Shutter
Install air cleaner body over the carburetor using a new gasket. NOTE: The VLV models use a closed loop breather system. The crankcase breather tube must be reconnected to the air filter body Not For Resale www.SmallEngineDiscount.com... -
Page 16: Governors And Linkage
Chapter 3 GOVERNORS AND LINKAGE All Tecumseh 4-cycle engines of recent manufacture TYPE I VLV TYPE II are equipped with mechanical type governors. As the SPOOL speed of an engine increases, centrifugal force moves the weights outward, lifting up the governor spool which contacts the governor shaft;... - Page 17 Linkage Installation: The solid link is always connected Speed Controls: This engine has an adjustable speed from the throttle lever on the carburetor to the lower control. Never exceed the manufacture’s recommended hole on the governor lever. The shorter bend has to be speeds.
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Page 18: Chapter 4 Starters
Chapter 4 STARTERS REWIND STARTER REINSTALL RETAINER PIN 1/8" FROM TOP DISASSEMBLY PROCEDURE. 1. After removing the rewind assembly from the engine, remove the starter handle by first pulling a length of rope out using the handle, tie a temporary knot in the exposed rope, then untie the knot in handle or pry out the staple. - Page 19 2. Untie the temporary knot and slowly allow the rope to fully retract into the starter housing and the recoil spring to fully unwind. RETAINER WEDGE 3. Remove the decal from the center of the starter housing. 4. Use a small Phillips screwdriver or similar tool to pry STARTER the retainer legs apart and lift out the retaining HOUSING...
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Page 20: Volts Starters
12 Volt Electric Starters Remove, inspect and replace as necessary. Use ELECTRIC STARTER REMOVAL. Remove face plate, reverse procedure for assembly. (For ease of assembly air cleaner assembly and gas tank. Compress plastic grommet and pull it out of the blower housing. Slide the assemble armature into brush end frame first.) Place a small amount of light grease such as lubriplate between wire through slot, being careful not to cut the wire... - Page 21 ELECTRIC STARTER ASSEMBLY ATTACH THE GROUND WIRE prior to assembling the electric starter to the baffle, attach the black ground wire to the electric starter through bolt so the the wire extends STARTER PRONGS between the two adjacent end cap prongs (illustration). Place the starter into the back plate with the ground wire bolt away from carburetor (see picture).
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Page 22: Flywheels And Servicing
Chapter 5 FLYWHEELS This engine uses one of two types of flywheels. The On engines with cored holes (not tapped) use flywheel first type is a cast iron high inertia flywheel. This type of puller Part No. 670306. flywheel will have a pressed on steel ring gear if the Screw the knock-off (no. -
Page 23: Brake System Operation
4. Install flywheel control bail at the operator position and the engine 5. Install the fan onto the flywheel so the Tecumseh is stopped. logo on the fan is on the magnet side of the flywheel. -
Page 24: Wiring
BATTERY. Check battery per manufacturer’s recommendations. The charging system on the engine BRAKE PAD maintains the battery during normal use. When battery is low, use the 120 volt auxiliary charger (usually supplied by the equipment manufacturer). GROUND CLIP TO REPLACE BRAKE PAD: 1. -
Page 25: Brake Mechanism Installation
CONTROL SWITCH. The brake lever must close the switch before the starter can be engaged. Disconnect battery from circuit before making check. Engines equipped with an electric starter have a control switch that is attached to the brake lever. The brake lever must close the switch before the starter can be engaged. -
Page 26: Chapter 6 Alternator
Chapter 6 ALTERNATOR TROUBLESHOOTING ELECTRIC START ENGINES. ALTERNATOR SOLID STATE MODULE Following is a list of possible problems and causes. LAMINATION SCREWS DEAD BATTERY Extended storage without charging Excessive cranking IGNITION COIL Faulty starter LAMINATION SCREW Faulty wiring Faulty alternator Faulty battery ALTERNATOR COIL... -
Page 27: Chapter 7 Ignition System
Chapter 7 IGNITION SOLID STATE IGNITION. Tecumseh’s solid state The proper air gap setting between magnets and the capacitor discharge ignition (CDI) is an all electronic laminations on CDI systems is .0125'’. Place .0125'’ ignition system and is encapsulated in epoxy for gauge, Part No. -
Page 28: Piston, Rings And Connecting Rod
OIL CONTROL RING MATCH MARKS NOTE: EMISSION COMPLIANT VLV USES THIS RING PACKAGE PISTON. Before removing piston, clean any carbon from the top of the cylinder bore to prevent ring breakage when removing the piston. Push the rod and piston out through the top of the cylinder. -
Page 29: Cylinder And Cylinder Head Service
Chapter 9 CYLINDERS AND CYLINDER HEADS CYLINDER SERVICE. Check cylinder for dirty, broken CYLINDER HEADS. Check cylinder heads for warpage or cracked fins, worn or scored bearings or scored by placing on a flat surface. If the cylinder head gasket cylinder bore surface, and warped head mounting surface is warped in excess of .005 inches (.13 mm), surface. -
Page 30: Crankshaft, Camshaft And Lubrication
Chapter 10 CRANKSHAFTS, CAMSHAFTS AND LUBRICATION CRANKSHAFTS. Inspect crankshaft for worn, scratched or damaged bearing surfaces, out-of-round or flat spots on the journal area, or a bent P.T.O. end. CAUTION: Never try to straighten a bent crankshaft. When installing a crankshaft, lubricate all bearing surfaces and use oil seal protector part no. -
Page 31: Lubrication System Operation
LUBRICATION SYSTEM: All Tecumseh Vertical shaft 4-cycle engines use a positive displacement plunger oil pump to pump oil from the crankcase, up through the camshaft to a passage in the breather box to the top crankshaft main bearing, and ultra balance bearings. - Page 32 The breather compartment is located under the flywheel. A check valve allows excess crankcase pressure to be vented through the element and out the breather tube. The breather tube is connected to the air cleaner body. When reassembling the breather, DO NOT pinch the filter element under the breather cover or leak may occur.
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Page 33: Valves, Lifters, Springs And Seats
Chapter 11 VALVES, LIFTERS, SPRING & VALVE SEATS VALVES. Valves must be in good condition, proper BOTTOM sealing and proper gap must be maintained for full NARROWING power, easy starting and efficient operation. CUTTER VALVE REMOVAL. To remove valves, use a commercially available valve spring compressor. -
Page 34: Valve Installation
Refer to Table of Specifications to determine correct oversize dimension. Reamers are RIGHT available through your Tecumseh parts suppliers. See Tool Section for correct part numbers. VALVE ADJUSTMENT. Clearance between the valve stem and lifter must be set to the recommended After oversizing valve guides the seats must be recut to specifications when the engine is cold (see page 40). -
Page 35: Removing The Mounting Flange
Chapter 12 OIL SEAL SERVICE AND MOUNTING FLANGE OIL SEAL SERVICE. Drain oil from crankcase. If the If crankshaft is out of engine, remove old oil seals by crankshaft end is rusty or pitted, polish the crankshaft tapping them out with a screwdriver or punch from the with emery cloth so it will not damage the bearings when inside. -
Page 36: Chapter 13 Troubleshooting
Chapter 13 TROUBLESHOOTING A. COMMON TROUBLES AND REMEDIES. The following charts list the most common troubles experienced with gasoline engines. Possible causes of trouble are given along with probable remedy. B. 4-CYCLE ENGINE TROUBLESHOOTING CHART Cause Remedy and Reference ENGINE FAILS TO START OR STARTS WITH DIFFICULTY No fuel in tank Fill tank with clean, fresh fuel. - Page 37 4-CYCLE ENGINE TROUBLESHOOTING CHART (Cont.) Cause Remedy and Reference ENGINE MISSES UNDER LOAD Spark plug fouled Replace spark plug. Spark plug porcelain cracked Replace spark plug. Improper spark plug gap Regap spark plug. Improper valve clearance Adjust valve clearance to recommended specifications. Weak valve spring Replace valve spring.
- Page 38 4-CYCLE ENGINE TROUBLESHOOTING CHART (Cont.) Cause Remedy and Reference ENGINE USES EXCESSIVE AMOUNT OF OIL Engine speed too fast. Using tachometer adjust engine RPM to spec. Oil level too high. To check level turn dipstick cap tightly into receptacle for accurate level reading.
- Page 39 4-CYCLE ENGINE TROUBLESHOOTING CHART (Cont.) Cause Remedy and Reference OIL SEAL LEAKS New seal installed without correct seal driver and Replace with new seal, using proper tools and methods. not seating squarely in cavity. New seal damaged upon installation. Use proper seal protector tools and methods for installing another new seal.
- Page 40 C. TROUBLESHOOTING CARBURETION. POINTS TO CHECK FOR CARBURETOR MALFUNCTION TROUBLE CORRECTIONS Engine will not start 1, 2, 3, 4, 5, 6, 8, 14, 15, 17 Engine will not accelerate 2, 3, 17 Engine hunts (at idle or high speed) 3, 4, 8, 9, 14 Engine will not idle 4, 8, 9, 14 Engine lacks power at high speed...
- Page 41 D. TROUBLESHOOTING 12 VOLT STARTERS PROBLEM PROBABLE CAUSE Does not function Weak or dead battery Check charge and/or replace battery. Corroded battery terminals and/or Clean terminals and/or connections. electrical connections Brushes sticking Free brushes. Replace worn brushes and those which have come in contact with grease and oil.
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Page 42: Troubleshooting
TROUBLESHOOTING 12 VOLT STARTERS (Cont.) PROBLEM PROBABLE CAUSE Motor stalls under load Shorted or open armature Replace armature. Shorted field coil Correct, or replace housing assembly. Intermittent operation Brushes binding in holders Free up brushes. Replace worn brushes and those which have come in contact with grease and oil. -
Page 43: Chapter 14 Engine Specifications
Chapter 14 ENGINE SPECIFICATIONS VLV40 VLV50, 55, 60, 65 Displacement 11.19 183.4 cc 12.6 207 cc Stroke 2.047 51.993 mm 2.047 51.993 mm Bore 2.6390 67.031 mm 2.796 71.018 mm 2.6380 2.795 70.993 mm Air Gap Dimension Ignition .0125 .30 mm .0125 .30 mm Spark plug gap... -
Page 44: Torque Specifications
TORQUE SPECIFICATIONS Inch-Lbs. Governor Rod Clamp to Lever 7-12 1.4 - 1.4 Breather Cover 40-50 4.5 - 5.7 Valve Box Cover 25-35 3.1 - 4.0 Connecting Rod 95-110 10.7 - 12.4 Cylinder Head 180-220 20.3 - 25 Mounting Flange or Cylinder Cover 100-130 11.3 - 14.7 Housing Baffle to Cylinder... -
Page 45: Chapter 15 Training Aids And Tools
CARBURETOR TROUBLESHOOTING BOOKLET 695015 695907 Carburetor Troubleshooting. Covers identification of This booklet is designed as a quick carburetors used on Tecumseh engines and how to reference to carburetion problems and troubleshoot and repair them. VHS only. related repair procedures. 695059 Understanding Tecumseh Ignition Systems. - Page 46 TOOLS TOOL KIT 670195C Kit contains tools for 2- and 4-cycle engines. Includes all items on this page but items may be purchased separately. 670315A VALVE SPRING COMPRESSOR FOR OVM, OVXL120-125, OHV11-13 VALVE SPRING COMPRESSOR FOR OH ENGINE 670297 AIR GAP GAUGE .0125" 670253A CARBURETOR FLOAT SETTING TOOL...
- Page 47 TORX DRIVERS FLYWHEEL KNOCK-OFF TOOL Torx 8 670334 Torx 10 670333 Torx 15 670323 Torx 20 670324 Torx 25 670319 No. 670169 Torx 30 670320 VIBRATION TACHOMETER No. 670156 - Vibration tachometer. No. 670117 - Ring Expander No. 670327 - Seal Protector Driver No.
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Page 48: Sears Craftsman Cross Reference
Chapter 16 SEARS CRAFTSMAN CROSS REFERENCE CHART 143.434112 VLV55-501004 143.434252 VLV55-501008 143.945500 VLV55-501004A 143.956000 VLV60-502003A 143.956002 VLV60-502004A 143.956006 VLV60-502012A 143.966000 VLV60-502015B 143.966006 VLV60-502023B 143.966008 VLV60-502024B 143.966500 VLV65-502501A 143.966502 VLV65-502502A 143.966504 VLV65-502503A 143.966506 VLV65-502504A 143.966508 VLV65-502505A 143.976000 VLV60-502015C Not For Resale www.SmallEngineDiscount.com... - Page 49 DECIMAL/FRACTION CONVERSIONS .016 = 1/64 .516 = 33/64 .031 = 1/32 .531 = 17/32 .047 = 3/64 .547 = 35/64 .063 = 1/16 .563 = 9/16 .078 = 5/64 .578 = 37/64 .094 = 3/32 .594 = 19/32 .109 = 7/64 .609 = 39/64 .125 = 1/8 .625 = 5/8...
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