2008 STIHL BG 56/66/86 & SH 56/86 Blower Service Manual and Parts List Collection

This collection combines STIHL’s 2008-01 service manual for BG 56/66/86 and SH 56/86 blowers and vacuums, including their C variants, with two illustrated parts lists for additional blower models. The service manual carries the printed identifier 0455 296 0123.

• Engine repair: Engine removal and installation, cylinder and piston service, crankshaft replacement, bearing work, oil-seal replacement, and engine leakage testing.

• Ignition diagnosis: Spark testing, ignition-module replacement, stop-switch and wiring checks, and the Ignition System Troubleshooting flowchart.

• Fuel system: Carburetor leak testing, diaphragm and inlet-needle service, basic and standard adjustments, tank-vent testing, and fuel-hose replacement.

• Starting systems: Rewind-starter disassembly, pawl and rope-rotor service, starter-rope replacement, rewind-spring tensioning, and ErgoStart spring and carrier procedures.

• Fan housings and controls: Fanwheel and intake-screen replacement, blower and vacuum attachment service, throttle controls, and model-specific anti-vibration repairs.

• Additional parts lists: Exploded assembly views, item numbers, quantities, and model-specific component references for BG 75 and the BG 45/46/55/65/85 family.

The service manual is intended for properly equipped repair shops, with dedicated test equipment and special servicing tools used throughout.

Engine Repair and Sealing

This service manual provides removal and installation procedures covering the engine assembly, piston, cylinder, and crankshaft. Oil-seal replacement is documented without internal engine disassembly; access to the fan-side seal still requires engine removal.

The crankshaft, connecting rod, and needle bearing form an inseparable replacement assembly. Piston-ring positioning views show the relationship between the ring gaps and fixing pins; incorrect positioning during cylinder installation can break the rings.

Carburetor and Fuel-System Diagnosis

The fuel system section breaks down carburetor service, detailing metering-diaphragm replacement, inlet-needle inspection, and tank-vent testing. Pump-diaphragm and fuel-strainer service are covered alongside fuel-hose replacement and spacer-flange inspection.

Separate basic and standard carburetor settings address different service situations, with illustrations identifying the adjustment controls and limiter caps. Leakage-test diagnosis links pressure loss to needle, diaphragm, or gasket faults, helping distinguish a sealing problem from an adjustment issue. The equipment references include carburetor and engine tester 0000 850 1300.

Ignition Testing and Wiring

The Ignition System Troubleshooting flowchart traces no-spark and running faults through the plug, boot, flywheel, wiring, and stop switch. Short Circuit Wire illustrations show the separate-wire and combined-harness arrangements.

The ignition module and ignition lead form a replacement unit. Ignition timing is fixed; the documented workshop test checks spark production rather than providing an ignition-timing adjustment.

ErgoStart, Anti-Vibration Mounts, and Housings

ErgoStart procedures cover its spring and carrier alongside conventional rewind-starter repairs. The anti-vibration and handle sections specifically distinguish BG 66 C, BG 86/86 C, and SH 86/86 C from the other service-manual models.

Component-specific torque tables distinguish DG and P (Plastoform) fasteners. Cutting a fresh thread in an existing polymer screw hole weakens the assembly.

Observe the manual’s precautions for flammable fuel, ignition-system high voltage, and stored starter-spring tension.

Parts Identification for the Additional Models

The BG 75 parts list, identified by type code 4227, includes exploded carburetor views for C1Q-S47, C1Q-S30C, and WT-413 versions.

The separate 4229 catalog covers BG 45, BG 46, BG 55, BG 65, and BG 85, plus each model’s C variant. Model footnotes distinguish carburetors, starter assemblies, mufflers, and fan housings. Serial-linked inner fan-housing and filler-cap entries help identify earlier component versions before selecting listed part numbers.

These additional models have parts-identification coverage only. Their workshop repair procedures are not included in the BG 56/66/86 and SH 56/86 service manual.

Carburetor Pressure and Ignition Resistance Preview

Carburetor testing: The carburetor leakage test specifies about 0.8 bar (80 kPa) of gauge pressure, with diagnosis covering inlet-needle, diaphragm, and gasket sealing.

Ignition reference: The diagnostic flowchart lists 1.5–12 kΩ for resistance measured from the spark plug boot to ground as part of its ignition-lead checks.

Searchable Text, Bookmarks, and PDF Contents

Search and section access: Embedded text supports searches in the service procedures and both parts lists. PDF bookmarks navigate the service chapters and the beginning of each parts list; individual parts-list illustrations are not separately bookmarked.

One printable PDF contains 178 pages across three publications. The service manual is in English; the parts lists include German, English, and French.

These counts include three covers, the service-manual imprint page and numbered blank page, and both parts-list symbol keys.