Chainsaw STIHL 051, 076 Service Manual

This 256-page OEM publication (Form 0455 111 0123) delivers the factory specifications necessary for servicing 1117-series chainsaws. Covering the 1980 STIHL 051 and 076 lineups—including the 051 AV, 075, and 076 AVE—it breaks down the mechanical differences between early breaker-controlled systems and later electronic ignitions.

• 47 exploded-view diagrams and 4 diagnostic flow charts
• Torque specification tables for engine and chassis reassembly
• Critical clearances for crankshaft bearings and big-end needle cages
• Cylinder bore measurements for both 89 cc and 111 cc powerheads

Engine and Fuel System Architecture

Rebuilding a vintage two-stroke powerhead requires exact tolerances. This documentation details the crankcase construction and piston assemblies for both displacement groups. Mechanics get a clear look at the all-position diaphragm carburetor's internal circuits. The text covers fuel pump pulse-line mechanics and factory jet adjustment settings, taking the guesswork out of tuning and troubleshooting.

Ignition, Lubrication, and Maintenance

Tracking down spark issues is straightforward with the correct diagnostic data. The manual outlines both the early breaker-controlled magnetos—specifying ignition timing at 1.9 to 2.1 mm before T.D.C.—and the upgraded transistor-controlled electronic setups. For the bar and chain, the automatic oil pump section breaks down the adjusting lever settings required to hit delivery rates between 7 and 19 cm³/min.

Working on chainsaw engines involves significant mechanical risks. Always verify clearances and torque values against this complete OEM reference before tearing down a saw, as the data provided here serves strictly as a descriptive review of the manual's contents. Rely on the full manufacturer documentation for any hands-on shop work to ensure safe and reliable operation.