STIHL 070, 070AV, 090, 090AV & 090G Chain Saw Factory Service Manual (P/N 11061109)

• Official 289-page OEM publication (11061109, dated April 1969) documenting the 1106 and 1109 platform models
• Covers the 1969 STIHL 070, 070AV, 090, 090AV, and 090G chain saws, including specific machine numbers 1 163 000 and 1 302 500
• Features 12 exploded-view parts diagrams to map out specific build sequences and component relationships
• Provides comprehensive torque specification tables for critical engine assemblies
• Serves as the authoritative baseline for the documented serial number range, delivering essential details for primary engine configurations
• Details 075, 076, 084, and 088 heavy-duty powerheads
• Outlines chain brakes, rewind starters, wrap around handles, AV-systems, and Tillotson carburetors

Component and System Documentation

This PDF service manual outlines the technical assembly and maintenance requirements for the professional-grade chain saw lineup. Mechanics can bypass expensive repair shop fees by utilizing the factory step-by-step instructions for exposing the armature plate, replacing the set of points, assembling a new starter rope, and pressure testing the crankcase. Technicians will find detailed chapters covering engine specifications, clutch drive assembly, carburetor adjustment, and ignition timing procedures. It also highlights the specific oil pump design used in the 090G transmission variant. Every major system is broken down through descriptive parts lists, carburetor schematics, ignition system drawings, chain brake views, and rewind starter charts. These layouts clearly identify the build sequence for the 070, 090, and 090G series, as well as the later 075, 076, 084, and 088 platforms. Utilizing these visual aids directly on the workbench accelerates diagnostic work and ensures exact OEM parts identification, preventing costly reassembly errors during bench teardowns or total rebuilds.

Professional Troubleshooting and Repair Pitfalls

When troubleshooting these legendary large-displacement powerheads, having exact factory data is a major advantage. On the 070 and 090 models, the mechanical wind vane speed governor is highly susceptible to sawdust packing; if it binds, the engine loses its RPM limitation, risking severe connecting rod damage. Similarly, on the 084 and 088 heavy-duty series, mechanics must carefully inspect the impulse hose for micro-leaks to prevent lean-run cylinder scoring, and ensure the oil pump worm gear is perfectly seated to avoid instant drive failure during reassembly.

Engine and Maintenance Specifications

Accurate maintenance relies on exact factory data. This guide lists critical reference values, including tightening torques, fuel mixture ratios, and ignition system parameters. For instance, cylinder head bolts require a torque of 27 Nm, while the crankshaft nut is specified at 45 Nm. Ignition timing is set precisely at 2.8 to 3.2 mm before T.D.C. Furthermore, the documented fuel mixture for the STIHL 070 and 090 is a 1:40 ratio when using official oil products. Always cross-reference these specifications with the full OEM documentation prior to conducting any major repair, as safe and reliable operation depends on adhering to original factory tolerances and professional workshop practices to prevent personal injury.