STIHL 028 and 038 Chainsaw Service Manual (P/N 1118-080-1805)

• Original OEM publication P/N 1118-080-1805 detailing technical specifications, component construction, and maintenance intervals for professional and owner service
• Documents 1979–2007 STIHL 028 and 038 variants, including AV, AVQ, AVE, and AVEQ electronic ignition, Quickstop, and standard configuration models
• Features 12 troubleshooting charts covering engine, clutch, ignition, oil pump, and carburetor systems to streamline workshop diagnostics
• Includes detailed cross-sectional diagrams and exploded-view illustrations for major engine and drivetrain assemblies
• Provides exact adjustment values for ignition timing, carburetor settings, and leakage testing thresholds

Engine and Component Documentation

This 149-page technical reference provides in-depth documentation for the complete engine assembly. It details the two-part, drop-forged crankshaft and cylinder block construction. The service manual outlines both breaker-controlled and transistor-controlled ignition modules, featuring specific diagnostic procedures for testing primary and secondary windings. Additional sections cover the oil pump and chain brake systems. These chapters explain the operation of the centrifugal clutch and the automatic oil delivery mechanism. Exploded-view diagrams illustrate every component to guide correct reassembly sequencing on the workbench.

Precision Technical Data Preview

Having exact baseline data is crucial for effective bench work. Engine maximum torque is documented at 2.65 Nm at 6000 rpm, while the cylinder base screw requires 7.8 Nm of torque. For breaker-controlled systems, the magneto edge gap is specified at 4–8 mm. The intake valve control lever adjustment proves critical for proper carburetor function, with high-speed adjustment screw settings starting at approximately 1 1/4 turns open. Crankcase leakage test pressure for the 028 model is set at 0.5 bar. Adhering strictly to these OEM tolerances is essential for safe saw operation and preventing severe component failure during heavy cutting tasks. This overview describes the manual's contents and technical data points. The publication itself serves as the complete reference for maintenance and assembly.