Briggs Stratton Small Gas Engine Service Maintenance

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Small Gas Engine Service & Maintenance Engine Codes:

All Briggs Stratton engines have special codes that are stamped on the blower housing of the engine. These codes are very beneficial when servicing a small gas engine because they contain the most basic information about the engine itself. The following is an excerpt from your Briggs & Stratton Service and Repair Instruction Book, it will explain the meaning of each code and how they are used.

HOW TO READ BRIGGS & STRATTON MODEL, TYPE AND CODE NUMBERS MODEL 92902

TYPE 1234-01

CODE 90012201

Model Number Explanation: I. The first one or two digits indicate the approximate CUBIC INCH DISPLACEMENT. II. The first digit after displacement designates the BASIC DESIGN SERIES, relating to cylinder construction, ignition, or other major differences. III. The second digit after the displacement indicates POSITION OF CRANK SHAFT, TYPE OF CARBURETOR, and sometimes GOVERNOR. IV. The third digit after displacement indicates TYPE OF BEARING and whether or not the engine is equipped with REDUCTION GEARS, AUXILIARY PTO, and/or PRESSURE LUBRICATION. V. The last digit indicates the TYPE STARTER, or CHARGING SYSTEM. BRIGGS & STRATTON MODEL NUMBER SYSTEM Example: See the chart in a Briggs & Stratton Service Manual MODEL 92902 9 2 9 0 9 Cubic Inches Design Series 2 Vertical Crank Plain Bearing Pulsa- Jet Carb.

2 Rewind Starter

TYPE 1234-01. The Type number identifies the engine’s mechanical parts, color of paint, decals, Governor Speed, and Original Equipment Manufacturer. CODE 90012201. The Code is the manufacturing date and is read as follows: YEAR 90

MONTH 01

DAY 22

ASSEMBLY LINE and MANF. PLANT 01

Fuels & The Fuel System: Fuels:

Briggs & Stratton engines call for any gasoline that is intended for automotive use and has an octane rating higher than 77. It is recommended that a lead-free gasoline be used because lead-free gasolines leave fewer deposits and tend to prolong valve life. It is not recommended to use any gasoline that contains alcohols such as Gasohol, Ethanol, or Methanol. Fuel System: The fuel system is designed to transform liquid fuel into an atomized state, or an air-fuel mixture. After creating this air-fuel mixture, it is the job of the system to transport the mixture into the cylinder head where it will be compressed and ignited. The fuel system on many types of small engines is serviced by one or a combination of the following: 1. Cleaning jets, ports, and all other carburetor parts. 2. Removing old and/or dirty fuel and all trash particles from the system. 3. Replacing diaphragms, gaskets, O-rings, and/or springs. 4. Replacing Worn or Faulty parts. Servicing the fuel system, which consists of the fuel tank, the carburetor, the fuel line, and the fuel filter, will be covered more thoroughly in other labs.

Air Cleaners:

Types of Air Cleaners: There are several types of air cleaners and they each have their own distinct way of filtering the air that enters the engine. Oil Bath Air Cleaner: Oil bath air cleaners, (Figure, 1.6), are commonly used on engines that perform regularly in dirty conditions, because of their ability to collect larger amounts of dirt particles. Incoming air is forced through a sharp turn directly above an oil reservoir which captures any dirt or particles that may accompany it. Cleaning this type of air cleaner simply involves washing out the metal bowl with a solvent, drying the bowl , and refilling the bath with fresh oil.

Fig. 1.6, Oil Bath Air Cleaner Courtesy of Briggs & Stratton Corp.

Dry Paper Type Element: A dry paper element,(Figure, 1.7), draws air through it’s porous surface which allows it to catch any particles that may accompany the air flow. The element may be cleaned by lightly tapping it or by blowing the dirt away from the inside-out with low pressure air. Do not soak or wash a dry paper element. Also, a dry paper element shou