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s Operator's Manual OH318EA (OHM90-110) Four-Cycle Engine • Horizontal Crankshaft • Air-Cooled Table of Contents IMPORTANT NOTICE! Safety Definitions ii I. General Safety Precautions 1 II. How to Get Service 3 III. Oil and Fuel Specifications 4 IV. Before Starting Your Engine 4 V. Starting Your Engine 7 VI. Stopping Your Engine and Short-Term Storage 12 VII. Maintenance 12 VIII. Transporting Your Engine 16 IX. Storing Your Engine 17 X. Preventing Forest, Brush and Grass Fires 18 XI. Maintenance Intervals 19 California & US EPA Emission Control Warranty Statement ........ 20 Emission Control System Warranty 21 XII. Warranty Information 22 Visit our web site at www.TecumsehPower.com LOG ON! Register Your TecumsehPower Engine Maintenance Tips On-Line Store Locate your nearest TecumsehPower Servicing Dealer 181-719-14 (English) 6/01/08

Section	Page
s	1
OH318EA (OHM90-110)	1
Four-Cycle Engine . Horizontal Crankshaft . Air-Cooled	1
I. General Safety Precautions 1	1
II. How to Get Service 3	1
III. Oil and Fuel Specifications 4	1
IV. Before Starting Your Engine 4	1
V. Starting Your Engine 7	1
VI. Stopping Your Engine and Short-Term Storage 12	1
VII. Maintenance 12	1
VIII. Transporting Your Engine 16	1
IX. Storing Your Engine 17	1
X. Preventing Forest, Brush and Grass Fires 18	1
XI. Maintenance Intervals 19	1
XII. Warranty Information 22	1
181-719-14	1
(English) 6/01/08	1
Safety Definitions	2
Notice Regarding Emissions	2
I. General Safety Precautions	3
A. Avoid Carbon Monoxide Poisoning	3
B. Avoid Gasoline Fires	3
C. Adult Supervision of Operation, Refueling and Maintenance	3
D. Stay Away from Rotating Parts	3
E. DO NOT Modify Engine	4
F. Avoid Burns and Fire from Hot Surfaces	4
G. Avoid Accidental Starts	4
H. Use Hearing Protection	4
Figure 1. DO NOT Use Without Engine Shaft Guard	4
1. Muffler Guard	4
2. Flywheel Guard	4
Figure 2. Typical Engine Guard Locations	4
Figure 3. Disconnecting/Connecting Spark Plug	4
Figure 4. Typical Spark Plug Connection	4
II. How to Get Service	5
A. Engine Identification Decal	5
B. Technician’s Handbook	5
Figure 5. Engine Identification Decal	5
Figure 6. Technician’s Handbook	5
III. Oil and Fuel Specifications	6
A. Oil	6
B. Fuel	6
IV. Before Starting Your Engine	6
A. Checking Oil Level	6
Table 1. Recommended Oil	6
Table 2. Recommended Fuel	6
10%	6
10%	6
15%	6
15%	6
Figure 7. Engine Oil Level	6
B. Filling Oil Sump	7
I. Oil Fill Cap/Dipstick	7
1. Be sure engine is upright and level.	7
2. Unscrew oil fill cap/dipstick from oil filler tube and wipe dipstick clean. See Figure 8.	7
3. Screw oil fill cap/dipstick back into oil filler tube. Tighten securely.	7
4. Unscrew and remove oil fill cap/dipstick from oil filler tube. Note oil level. If oil reading on dipstick is below “ADD” mark, slowly add oil to reach “FULL” level. See Figure 7 on page 4. Afterward, continue reading instructions below.	7
5. Screw oil fill cap/dipstick back into oil filler tube. Tighten securely.	7
6. Wipe away any spilled oil.	7
II. Oil Fill Cap/Plug	7
1. Be sure engine is upright and level.	7
2. Clean area around oil fill cap/plug. See Figure 9.	7
3. Unscrew oil fill cap/plug.	7
4. Add oil to overflow point, making sure to avoid spilling.	7
5. Screw oil fill cap/plug back into oil fill hole. Tighten securely.	7
6. Wipe away any spilled oil.	7
1. Carburetor	7
2. Air Cleaner	7
3. Muffler	7
4. Muffler Guard	7
5. Oil Fill Cap	7
6. Spark Plug Cap	7
7. Fuel Fill Cap	7
8. Starter Cord Handle	7
Figure 8. Engine Components	7
Figure 9. Oil Fill Locations	7
C. Engine Stop Switch	8
D. Low Oil Shutdown Switch	8
E. Low Oil Shutdown Light	8
F. Low Oil Shutdown System	8
1. “ON” Position	8
2. “OFF” Position	8
Figure 10. Engine Stop Switch	8
1. “ON” Position	8
2. “OFF” Position	8
3. Lighted Switch	8
Figure 11. Low Oil Shutdown Switch	8
G. Filling Fuel Tank	9
1. Stop engine and allow it to cool before refueling.	9
2. Be sure engine is outdoors and in a well-ventilated area.	9
3. Clean area around fuel fill cap and remove fuel fill cap. See Figure 8 on page 5. Afterward, continue reading instructions below.	9
4. Using an approved red GASOLINE container, add fuel slowly, being careful to avoid spilling. DO NOT overfill fuel tank. Leave space in the tank to allow fuel to expand without overflowing.	9
5. Replace fuel fill cap securely and wipe up spilled fuel before starting engine. If fuel is spilled DO NOT start engine. Move machine away from area of spillage. Avoid creating any source of ignition until fuel vapors are gone.	9
6. Be sure fuel valve, if present (see equipment manufacturer’s instructions) is open. See Figure 13.	9
V. Starting Your Engine	9
Figure 12. Possible Fuel Fill Cap(s)	9
Figure 13. Fuel Valve Positions	9
A. Engines with Electric Starters	10
1. To avoid carbon monoxide poisoning, be sure engine is outdoors in a well-ventilated area.	10
2. Be sure fuel valve, if present (see equipment manufacturer’s instructions) is open and all switches are on. See Figure 14.	10
3. Move engine speed control to “FAST” position. See Figures 15 thru 17.	10
4. Set choke control to “FULL CHOKE” position (see equipment manufacturer’s instructions). See Figures 18 thru 20 on page 9. Afterward, continue reading instructions below.	10
5. Push starter button or turn ignition switch key (see equipment manufacturer’s instructions) to start engine.	10
Figure 14. Fuel Valve Positions	10
Figure 15. Typical Engine Symbols	10
Figure 16. Engine Mounted Speed Control	10
Figure 17. Engine Components	10
6. When engine starts:	11
a. Release starter button or ignition switch key.	11
b. Momentarily move choke control to “1/2 CHOKE” position until engine runs smoothly. See Figures 18 thru 20.	11
c. Next, move choke control to “NO CHOKE” position. See Figures 18 thru 20.	11
7. Move engine speed control to desired speed in “RUN” range. See Figure 15 on page 8. Afterward, continue reading instructions below.	11
a. Momentarily move choke control back to “FULL CHOKE” position. See Figures 18 thru 20.	11
b. Next, move choke control to “1/2 CHOKE” position until engine runs smoothly.	11
c. Finally, move choke control to “NO CHOKE” position.	11
8. If engine fires but does not continue to run, move choke control to “NO CHOKE” position and start engine.	11
9. If engine fails to start after 3 attempts in the “NO CHOKE” position, move choke control to “FULL CHOKE” position and start engine.	11
10. If engine does not start after following steps 1 thru 9, contact your Authorized TecumsehPower Servicing Dealer. DO NOT attempt to start or troubleshoot this engine in any other way.	11
1. “No Choke” Position	11
2. “1/2 Choke” Position	11
3. “Full Choke” Position	11
Figure 18. OH Choke Control Positions	11
1. “No Choke” Position	11
2. “1/2 Choke” Position	11
3. “Full Choke” Position	11
4.	11
1. “Full Choke” Position	11
2. “1/2 Choke” Position	11
3. “No Choke” Position	11
4.	11
B. Engines with Recoil Starters	12
1. To avoid carbon monoxide poisoning, be sure engine is outdoors in a well-ventilated area.	12
2. Be sure fuel valve, if present (see equipment manufacturer’s instructions) is open and all switches are on.	12
3. Move engine speed control to ”FAST” position. See Figures 21 thru 23	12
4. Set choke control to ”FULL CHOKE” position (see equipment manufacturer’s instructions). See Figures 24 thru 26. Afterward, continue reading instructions below.	12
Figure 21. Engine Mounted Speed Control	12
Figure 22. Typical Engine Symbols	12
Figure 23. Engine Components	12
1. “No Choke” Position	12
2. “1/2 Choke” Position	12
3. “Full Choke” Position	12
Figure 24. Choke Control Option “A”	12
5. Grasp starter cord handle. See Figure 27.	13
a. Pull rope out slowly until you feel drag.	13
b. Without allowing the rope to retract, continue pulling rope with one rapid full arm stroke.	13
c. Return rope slowly to original position.	13
6. When engine starts:	13
a. Momentarily move choke control to “1/2 CHOKE” position until engine runs smoothly. See Figures 24 thru 26.	13
b. Next, move choke control to “NO CHOKE” position.	13
c. Finally, move engine speed control to desired speed in “RUN” range.	13
a. Momentarily move choke control back to “FULL CHOKE” position.	13
b. Next, move choke control to “1/2 CHOKE” position until engine runs smoothly.	13
c. Finally, move choke control to “NO CHOKE” position.	13
7. If engine fires but does not continue to run, move choke control to “NO CHOKE” position and start engine.	13
8. If engine fails to start after 3 attempts in the “NO CHOKE” position, move choke control to “FULL CHOKE” position and start engine.	13
9. If engine does not start after following steps 1 thru 8, contact your Authorized TecumsehPower Servicing Dealer. DO NOT attempt to start or troubleshoot this engine in any other way.	13
1. “No Choke” Position	13
2. “1/2 Choke” Position	13
3. “Full Choke” Position	13
4.	13
1. “Full Choke” Position	13
2. “1/2 Choke” Position	13
3. “No Choke” Position	13
Figure 26. OH Choke Control Positions	13
Figure 27. Starter Cord Handle	13
VI. Stopping Your Engine and Short-Term Storage	14
VII. Maintenance	14
1. Oil Fill Cap and Dipstick	14
2. Spark Plug Cap	14
3. Fuel Fill Cap	14
Figure 28. Engine Components	14
A. Checking and Changing Oil	15
1. Be sure you find the correct drain plug location, if provided. See Figure 29.	15
2. Carefully disconnect spark plug wire and keep it away from spark plug. See \	15
3. Be sure the fuel fill cap is on and tightened securely.	15
4. Clean area around oil drain plug. See Figure 29.	15
5. Place approved recyclable oil container under oil drain plug, if present.	15
6. Remove oil drain plug, if present. See Figure 29.	15
7. Tip engine to position the oil flow, so it will drain from the lowest point on the engine (see equipment manufacturer’s instructions).	15
8. Drain oil into an approved recyclable oil container.	15
9. Install oil drain plug and tighten securely.	15
10. Fill with recommended oil. See \	15
11. Wipe away any spilled oil.	15
12. Carefully disconnect spark plug wire from grounding post, if provided.	15
13. Connect spark plug wire to spark plug before attempting to start engine. See Figure 3 on page 2.	15
Figure 29. Oil Drain Plug Locations	15
Figure 30. Oil Fill Locations	15
B. Removing Debris from Engine	16
C. Spark Plug	16
1. Clean area around spark plug.	16
2. Remove and inspect spark plug.	16
3. Replace spark plug if porcelain is cracked or if electrodes are:	16
4. Check electrode gap with wire feeler gauge and set gap to-.030 in. (0.76 mm) if necessary. See Figure 32.	16
5. Install spark plug and tighten securely.	16
D. Cleaning/Replacing Air Cleaner	16
I. Servicing Foam Filters	16
1. Wash in warm water and detergent solution then press (DO NOT twist) until all dirt is removed.	16
2. Rinse thoroughly until water is clear.	16
3. Wrap in a clean cloth and press (DO NOT twist) until completely dry.	16
1. Levers and Linkage	16
2. Air Intake Screen	16
3. Muffler Guard	16
4. Cooling Fins	16
Figure 31. Debris Removal Areas	16
1. .030 (0.76 mm) Gap	16
2. Electrodes	16
3. Porcelain	16
Figure 32. Resistor Spark Plug	16
4. Replace foam pre-filter onto paper filter.	16
II. Servicing Paper Filters	16
III. Removal and Installation of OH318EA Air Filters	17
1. Remove wing nuts and air cleaner cover. See Figure 33.	17
2. Remove foam filter from paper filter.	17
3. Remove paper filter from base.	17
4. Inspect filters for discoloration or dirt accumulation. If either is present, see \	17
5. Clean inside of base and air cleaner cover thoroughly.	17
6. Install paper filter into base.	17
7. Install foam filter onto paper filter.	17
8. Install air cleaner cover on base.	17
9. Install wing nuts and tighten securely.	17
E. Anti-Icing Baffle	17
1. Remove wing nuts from air cleaner cover. See Figure 33.	17
2. Remove air cleaner cover from base.	17
3. Rotate air cleaner cover in “WINTER” position shown. See Figure 34.	17
4. Install air cleaner cover onto base.	17
1. Remove wing nuts from air cleaner cover. See Figure 33.	17
2. Remove air cleaner cover from base.	17
3. Rotate air cleaner cover in “SUMMER” position shown. See Figure 34.	17
4. Install air cleaner cover onto base.	17
5. Install wing nuts and tighten securely.	17
1. Wing Nuts	17
2. Air Cleaner Cover	17
3. Foam Filter	17
4. Paper Filter	17
5. Base	17
Figure 33. Climate Guard Assembly	17
1. Summer Position-Above 32°F (0°C)	17
2. Winter Position-Below 32°F (0°C)	17
Figure 34. Air Cleaner Cover Positions	17
F. Alternator (Optional)	18
G. Carburetor	18
H. Engine Speed	18
I. Adjustments	18
VIII. Transporting Your Engine	18
1. Empty fuel tank by using a commercially available suction device designed for use with gasoline.	18
2. Drain fuel into an approved red GASOLINE container, being careful to avoid spilling.	18
3. Run the engine until remaining fuel is consumed.	18
IX. Storing Your Engine	19
A. Short-Term/Seasonal Storage	19
I. Clean Engine	19
II. Fuel Storage	19
III. Fuel System	19
IV. Fuel Treatment	19
1. Add fuel stabilizer according to manufacturer’s instructions.	19
2. Run engine at least 10 minutes after adding stabilizer to allow it to reach carburetor.	19
B. Extended Storage	19
I. Draining Fuel	19
1. To prevent serious injury from fuel fires, empty fuel tank by running engine until it stops from lack of fuel. DO NOT attempt to pour fuel from engine.	19
2. Run the engine while waiting until the remaining fuel is consumed.	19
3. Begin servicing the cylinder bore. See \	19
II. Oil Cylinder Bore	20
1. Carefully disconnect spark plug wire and keep it away from spark plug. See Figures 35 and 36.	20
2. Remove spark plug.	20
3. Squirt 1oz. (30 ml) of clean engine oil into spark plug hole.	20
4. Cover spark plug hole with rag to prevent fuel from spraying from spark plug hole when starter rope is pulled.	20
5. Grasp starter cord handle:	20
a. Pull starter cord handle out slowly using a full arm stroke.	20
b. Repeat once. (This will distribute oil throughout the cylinder to prevent corrosion during storage.)	20
c. Proceed to Step 8.	20
6. Push starter button or turn ignition switch key to “START” position (see equipment manufacturer’s instructions) to cycle the engine for one to two seconds.	20
7. Turn ignition switch key to “OFF” position. Repeat Steps 6 and 7. (This will distribute oil throughout the cylinder to prevent corrosion during storage.)	20
8. Remove rag covering spark plug hole.	20
9. Install spark plug.	20
10. Carefully disconnect spark plug wire from grounding post, if provided. See Figure 36.	20
11. Connect spark plug wire to spark plug before attempting to start engine.	20
Figure 35. Disconnecting/Connecting Spark Plug	20
Figure 36. Typical Spark Plug Connection	20
III. Oil	20
IV. Battery	20
X. Preventing Forest, Brush and Grass Fires	20
XI. Maintenance Intervals	21
Table 3. Maintenance Intervals	21
1. Change Oil	21
1. Check Oil Level	21
2. Clean Cooling Fins	21
1. Clean Foam Pre-Filter	21
1. Change Oil	21
1. Replace Paper Filter	21
2. Check Spark Plug	21
1. Replace Spark Plug	21