The Mechanical Dissection Laboratory manual has been developed as a guide to assist students during the tear-down and re-assembly of a Briggs and Stratton 3.5 horsepower (HP), 1 cylinder engine (Model Series No. 91200.) A complete list of the tools required for the tear-down and re-assembly is incorporated, including descriptions of various tool applications. This manual provides step by step details outlining the procedure for engine disassembly and re-assembly.
The ‘Tools’ section of the manual introduces the following apparatus; ratchets, sockets, spark plug sockets, torque wrenches, standard screw drivers, mallets, box and open ended wrenches, pliers and piston ring compressors. This section discusses features of the individual tools, and describes the manner in which these tools will be used during specific sectors of this laboratory. Further details of tool operation have been incorporated into the respective parts of the engine tear-down and re-assembly procedures of the manual.
General literature on components is included to provide background knowledge of major engine parts. Engine components discussed in this section include; engine block, cylinder head, crankshaft, piston and piston rings, connecting rod, bearings, flywheel and valve train. These elements used to describe the operation of a four stroke cycle engine. The four strokes are discussed in detail are the intake, compression, power and exhaust events. The compression system, valve overlap and valve dynamics, and piston design are xplained in this section.
The engine tear-down and re-assembly procedure is provided in a step-by-step format. Additional tool operation details are included to allow a thorough understanding of the sequence of subsequent steps. Graphics of a Briggs and Stratton Model Series No. 91200 engine tear-down and re-assembly are included for illustrative assistance.