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General Information Spark Plug Inspection and Replacement Since air gap between center and side electrodes in- creases gradually during normal engine operation, check condition of electrodes at hour intervals. Set air gap at 0. Clean area around spark plugs so dirt does not fall into cylinder when plugs are removed.
Pull wire off spark plugs and remove plugs from cylinder head. Check condition of center and side electrodes to determine operating temperature of engine.
Light brown insulator tip indicates correct spark plug and heat range. Black or oily insulator tip indicates an excessively rich fuel mixture, possibly caused by a dirty air cleaner element or a carburetor that is set too rich. Light gray or blistered-white insulator indicates overheating caused by a lean carburetor setting or incorrect spark plug heat range too high.
Do not sandblast, scrape or clean electrodes by using a wire brush because grit may release from the plug and enter combustion cham- ber resulting in engine damage. After setting air gap at 0. Tighten the plug to 11 - 15 ft-lb. Push wire onto spark plug.
Adjustments Alternator Belt Adjustment Fig. A used belt is to be re-tensioned to 40 lbs. To adjustable tension, loosen bolt securing brace to engine, bolt securing alternator to brace and alternator mounting bolts.
Insert pry bar between alternator and engine and pry out on alternator. Hold alternator in position after proper tension is achieved and tighten alternator and brace bolts to se- cure adjustment. Figure 1 1. Alternator 2. A used belt is to be re-tensioned to 28 lbs.
To adjust belt tension, loosen upper and lower nuts securing idler arm to front engine mount. Pull out on idler arm until desired belt tension is achieved. Tighten mounting nuts to secure adjustment. Figure 2 1. Edler arm 2. Governor Adjustment Fig.
With engine shut off, move throttle contro to FAST position and open hood. If gap is correct, to to step 2. Engine must be running so final adjustment of governor can be performed. To against possible personal injury, parking brake and keep hands, feet, face, and other parts of body away from fan and other moving parts. Start engine and move throttle to SLOW position. Allow engine to warm up to normal operating tempera- 1. Stop ture. Throttle rod 5.
Throttle arm 3. Carbruetor idle speed screw 3. Rotate throttle arm closed until it contacts stop. Tighten jam nut. Shut off engine. Adjust high idle stop screw until it contacts speed control lever.
The engine should not surge. If engine surges, go to step 8. Check V-belts from engine to governor pulley and make sure they are tight. If belts are loose, engine will surge. If belts are tensioned properly, loosen jam nut that retains anti-surge screw.
Should governor continue to surge, check the following: A. Carburetor too rich or too lean. Binding in throttle linkage. Governor worn internally. Bump throttle lever with your hand so engine speeds up momentarily. If governor is working properly, engine speed should return to normal within one or two surges of governor. More than two surges of governor usually indicates that the anti-surge screw must be turned in slightly more than it is. When adjustment is correct, lock jam nut against governor body.
Check low and high idle speed to be sure there is no change from initial setting. If high idle speed has increased, anti-surge screw has been turned into gov- ernor too far and it must be backed out. Then, repeat the entire adjustment procedure.
NOTE: If the throttle control on instrument panel will not stay in FAST position during operation, remove panel cover and tighten nut and capscrew at base of throttle lever assembly. Figure 4 1. High idle stop screw 5. Oil check plug 2. Speed control lever 6. Low idle stop screw 3. Jam nut 7. Oil fill plug 4. Repairs Crankshaft Pulley Installation 1. Insert three of four locking rings into crankshaft pulley. Inside locking rings have flat I.
Install first outside ring seated against small inter- nal shoulder of pulley, flat edge of ring touching small pulley shoulder. Install second inside ring, mating taper to taper with first ring.
Install third outside ring with flat edge against previous inside ring. Align ring end gaps with key slot in pulley. Align pulley key slot with crankshaft key. Insert fourth locking ring, taper to taper, with third ring.
Insert bolt through special washer. Shoulder on washer contacts shoulder of fourth locking ring. Draw pulley onto crankshaft by tightening crankshaft bolt. Resistance will be felt as crankshaft passes through locking rings. Tighten crankshaft bolt to a torque of ft-lb. Check pulley alignment between crankshaft and water pump.
Figure 5 1. Woodruff key 4. Special washer 2. Pulley 5. Metric bolt 3. Engine Removal and Installation Removing the Engine 1. Put machine on a level surface, stop engine, remove key from ignition switch and engage parking brake. Remove intake hose from air cleaner and carburetor. Disconnect battery cables from battery terminals.
Disconnect and tag all wires connected to engine and engine accessories. Put a drain pan under radiator, loosen radiator cap, loosen radiator petcock and allow radiator to drain com- pletely. Move drain pan under lower radiator hose.
Discon- nect hose from radiator and allow coolant to drain into pan. Remove lower and upper radiator hoses. Move drain pan under rear of engine and remove cylinder block plug located above starter to drain cool- ant from cylinder block. Install cylinder block plug.
Remove cable tie securing control cables and vacuum sensor hose near caburetor. Disconnect vacuum sensor hose from fuel trap on carbruetor. Disconnect choke control cable from carburetor. Disconnect throttle control cable from governor.
Remove fuel line from inlet side of fuel pump. NOTE: Be prepared to insert a plug into fuel line to prevent fuel spill. Remove capscrews securing fan shroud to radiator so fan shroud can be move during engine removal for cooling fan clearance. Attach a short section of chain between the two lifting shakles on the engine. Attach block and tackle or hoist chain to this short section of chain, approximately mid- way between the two shakles.
Remove four bolts securing rear engine mount to frame. Remove slack from lifting chain and carefully re- move two capscrews which pass through the two rubber front engine mounts. Lift and guide engine from engine compartment. Be careful not to damage the radiator cooling fan or other components during removal. Learn more - eBay Money Back Guarantee - opens in a new window or tab. Seller information. Save Seller.
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To find service bulletins: Go to the Customer Support section of the Toro website, click the Education and Technical Reference link near the bottom of the page, and click the Customer Service Bulletins link. You will need to enter the model number and serial number of your machine to look up and download available bulletins. The Education and Technical Reference section of our website is also a great resource for Service Training Guides , service tips and other educational resources.
This book provides easy access to the most commonly needed information, organized by Toro model. Using these online resources is an easy way to get answers and could even save you the time and costs associated with service calls.
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