Briggs & Stratton Vanguard 490000 Operator's Manual page 11

Service Cooling System
WARNING
Running engines produce heat. Engine parts, especially muffler, become
extremely hot.
Severe thermal burns can occur on contact.
Combustible debris, such as leaves, grass, brush, etc., can catch fire.
• Allow muffler, engine cylinder and fins to cool before touching.
• Remove accumulated debris from muffler area and cylinder area.
NOTICE Do not use water to clean the engine. Water could contaminate the fuel
system. Use a brush or dry cloth to clean the engine.
This is an air cooled engine. Dirt or debris can restrict air flow and cause the engine to
overheat, resulting in poor performance and reduced engine life.
Models With Cyclonic Air Filter System
See Figure: 18, 19
1. Use a brush or dry cloth to remove debris from the air intake area (A, Figure 18).
2. Keep linkage, springs and controls (B, Figure 18) clean.
3. Keep the area around and behind the muffler free of any combustible debris.
4. Make sure the oil cooler fins (C, Figure 18) are free of dirt and debris.
5. Loosen the fasteners (D, Figure 19) and remove the air intake grille (E). To access
all the fasteners, it may be necessary to remove fasteners (H) and air filter strap
(J). Pivot the air filter (K) to allow access to fastener.
6. Loosen the fasteners (F, Figure 19) and open the debris access panels (G).
Remove any grass and debris that has accumulated on the cylinders.
7. Close the debris access panels (G, Figure 19) and secure with the fasteners (F).
8. Install air filter strap (J, Figure 19) and secure with fasteners (H).
9. Install the air intake grille (E, Figure 18) and secure with the fasteners (D).
After a period of time, debris can accumulate in the cylinder cooling fins and cause the
engine to overheat. This debris cannot be removed without partial disassembly of the
engine. Have a Briggs & Stratton Authorized Dealer inspect and clean the air cooling
system as recommended in the Maintenance Schedule.
Models With Low Profile Air Filter System
See Figure: 20
1. Use a brush or dry cloth to remove debris from the air intake area (A, Figure 20).
2. Keep linkage, springs and controls (B, Figure 20) clean.
3. Keep the area around and behind the muffler free of any combustible debris.
4. Make sure the oil cooler fins (C, Figure 20) are free of dirt and debris.
5. Loosen the fasteners (D, Figure 20) and remove the air intake grille (E).
6. Remove any grass and debris that has accumulated on the cylinders.
7. Install the air intake grille (E, Figure 20) and secure with the fasteners (D).
After a period of time, debris can accumulate in the cylinder cooling fins and cause the
engine to overheat. This debris cannot be removed without partial disassembly of the
engine. Have a Briggs & Stratton Authorized Dealer inspect and clean the air cooling
system as recommended in the Maintenance Schedule.
Storage
WARNING
Fuel and its vapors are extremely flammable and explosive.
Fire or explosion can cause severe burns or death.
When Storing Fuel Or Equipment With Fuel In Tank
• Store away from furnaces, stoves, water heaters or other appliances that have
pilot lights or other ignition sources because they can ignite fuel vapors.
Fuel System
See Figure: 21
Store the engine level (normal operating position). Fill fuel tank (A, Figure 21) with fuel.
To allow for expansion of fuel, do not overfill above the fuel tank neck (B).
Fuel can become stale when kept in a storage container for more than 30 days. Each
time you fill the container with fuel, add fuel stabilizer to the fuel as specified by the
manufacturer's instructions. This keeps fuel fresh and decreases fuel-related problems
or contamination in the fuel system.
It is not necessary to drain fuel from the engine when fuel stabilizer is added as
instructed. Before storage, turn the engine ON for 2 minutes to move the fuel and
stabilizer through the fuel system.
If gasoline in the engine has not been treated with a fuel stabilizer, it must be drained
into an approved container. Run the engine until it stops from lack of fuel. The use of a
fuel stabilizer in the storage container is recommended to maintain freshness.
Engine Oil
While the engine is still warm, change the engine oil. See the Change Engine Oil
section.
Troubleshooting
For assistance, contact your local dealer or go to VanguardEngines.com or call
1-800-999-9333 (in USA).
Specifications
Model: 490000, 49E700, 49E800
Displacement
Bore
Stroke
Oil Capacity
Spark Plug Gap
Spark Plug Torque
Armature Air Gap - Carburetor Models
Intake Valve Clearance
Exhaust Valve Clearance
Engine power will decrease 3.5% for each 1,000 feet (300 meters) above sea level and
1% for each 10° F (5.6° C) above 77° F (25° C). The engine will operate satisfactorily
at an angle up to 15°. Refer to the equipment operator's manual for safe allowable
operating limits on slopes.
Service Parts - Model: 490000, 49E700, 49E800
Service Part
Cyclonic Air Filter (see Figure 15)
Cyclonic Safety Filter (see Figure 15)
Low Profile Air Filter (see Figure 16)
Air Filter Pre-cleaner (see Figure 16)
Oil - SAE 30
Oil Filter
Fuel Filter
Resistor Spark Plug
Long Life Platinum Spark Plug
Spark Plug Wrench
Spark Tester
We recommend that you see any Briggs & Stratton Authorized Dealer for all
maintenance and service of the engine and engine parts.
Power Ratings: The gross power rating for individual gasoline engine models is
labeled in accordance with SAE (Society of Automotive Engineers) code J1940 Small
Engine Power & Torque Rating Procedure, and is rated in accordance with SAE J1995.
Torque values are derived at 2600 RPM for those engines with "rpm" called out on the
label and 3060 RPM for all others; horsepower values are derived at 3600 RPM. The
gross power curves can be viewed at www.BRIGGSandSTRATTON.COM. Net power
values are taken with exhaust and air cleaner installed whereas gross power values
are collected without these attachments. Actual gross engine power will be higher than
net engine power and is affected by, among other things, ambient operating conditions
and engine-to-engine variability. Given the wide array of products on which engines
are placed, the gasoline engine may not develop the rated gross power when used in a
given piece of power equipment. This difference is due to a variety of factors including,
but not limited to, the variety of engine components (air cleaner, exhaust, charging,
cooling, carburetor, fuel pump, etc.), application limitations, ambient operating conditions
(temperature, humidity, altitude), and engine-to-engine variability. Due to manufacturing
and capacity limitations, Briggs & Stratton may substitute an engine of higher rated
power for this engine.
49.42 ci (810 cc)
3.300 in (83,81 mm)
2.890 in (73,41 mm)
66 - 68 oz (1,9 - 2,0 L)
.030 in (,76 mm)
180 lb-in (20 Nm)
.008 - .012 in (,20 - ,30 mm)
.004 - .006 in (,10 - ,15 mm)
.004 - .006 in (,10 - ,15 mm)
Part Number
841497
821136
796031
797704
100028
492932
691035
491055
5066
19374
19368
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