Service Bulletin #269

STINSON 108 · Service Bulletins

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Overview

This service bulletin provides detailed procedures for the installation of a 180 HP Franklin 6A335-B1 engine in place of the original Franklin 6A4-165-B3 engine for Stinson 108-3 models. It includes parts removal and installation steps, as well as a list of required parts for the conversion.

Applicable to Stinson 108-3 Landplane and Skiplane models, serial no. 108-3501 and up.
Details the removal and installation procedures for the new engine.
Includes a list of required parts for the engine conversion.
Emphasizes the need to check weight and balance after installation.
Requires final checks for oil leaks and proper operation.
F.A.A. approved Flight Manual must be attached post-installation.

Document

Source

Originally published by univair.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

View original at univair.com

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Document details

Type: Service Bulletins
Year: 1964
File size: 16 KB
Publisher: univair.com
Language: en

Specifications & performance

Extracted from this document.

Specifications

Empty weight cg range aft baggage: +10. to +13.7
Empty weight cg range standard baggage: +10. to +16.0

About this document

What is the Service Bulletin #269?

The Service Bulletin #269 is a service bulletins for the STINSON 108, dated 1964.

Where does the Service Bulletin #269 come from?

This copy of the Service Bulletin #269 was originally published by univair.com and is hosted on Sprinkle as a free, searchable reference copy.

What year was the Service Bulletin #269 published?

The Service Bulletin #269 — the STINSON 108 service bulletins on file — is dated 1964.

Documentation completeness

3/7

Most owners only have the POH. Here's the essential set for the STINSON 108.

Pilot's Operating Handbook / AFM
Checklist
Maintenance Manual
Parts Catalog (IPC)
Systems & Wiring
Service Bulletins on file
Type Certificate (TCDS)

More STINSON 108manuals & documents

In this document

Parts Removal

Outlines the steps to remove the original engine and associated components.

Parts Installed

Describes the installation process for the new engine and its components.

Parts Required for Conversion

Lists all parts needed for the conversion to the 6A-335-B1 engine.

Weight and Balance

Specifies the empty weight C.G. range and the need for ballast if outside this range.

Final Checks

Instructs to run up the aircraft and check for oil leaks and proper operation.

Documentation

Requires completion of the ACA337 Repair and Alteration form and log book entry.

Safety notes

If empty weight C.G. falls outside specified range, ballast may be required.
Ensure all connections are secure to prevent leaks and operational issues.

Full document text

SERVICE BULLETIN STINSON DIVISION UNIVERSAL AIRCRAFT INDUSTRIES DENVER, COLO. BULLETIN NO. 269 PAGE 1 of 3 June 11, 1964 TITLE: Procedure for Installation of 180 HP Franklin 6A335-B1 Engine in lieu of original Franklin 6A4-165-B3. MODELS AFFECTED: 108-3 Landplane and Skiplane, Serial no. 108-3501 and up. SECTION I Parts Removal 1. Remove spinner and propeller. 2. After disconnecting airscoop shroud, heat-muff blast tubes, remove all cowling. 3. Disconnect engine controls, generator wires, starter wires, fuel lines, oil lines, temperature bulbs, tachometer, Mag “P” leads from engine. 4. Remove exhaust stacks, heat muffs and tail stacks 5. Remove engine mount bolts and remove engine. 6. Remove engine mount bolts at firewall and remove mount. SECTION II Parts Installed 1. Install new or modified engine mount on airframe. P/N 108-6212000-1. 2. Remove intake pipes from intake manifold on new engine. Assy. 6A-335-B1. 3. Install new engine on mount. 4. Reinstall intake pipes. 5. Remove rear and side engine baffle assy. from old engine and install on new engine. 6. Install prop governor P/N 210453 on left front engine accessory drive pad. 7. Remove oil cooler and mount brackets from old engine. Be sure to flush and clean oil cooler. Mount brackets and cooler installed on new engine in same position as original. Note – Oil cooler must be heat exchanger Model 102-C. 8. Route and connect oil temp. bulb. 9. Remove throttle knob and mount nut from front side of panel. 10. Install prop control bracket and brace P/N U-108-6221512 and U-108-6221511 according to Print U-108- 6221510. 11. Route and install prop control P/N 3U700-1075-C-60 according to print and rig U-108-6221510. 12. Reinstall throttle nut and knob. 13. Install new front engine baffle assembly P/N 108-6221201-2. 14. Install carb. P/N 10-4674. 15. Install mixture control bracket on left rear carb. mount bolt. 16. Install adapter to carb. Mixture control lever. 17. Connect mixture control and rig travel. 18. Install carb. air box. 19. Connect carb. air heat control and rig. 20. Connect fuel lines to carb. Page 2 Stinson Service Bulletin #269 (cont’d) 21. Connect throttle and rig. 22. Connect wires to generator. 23. Connect wires to starter. 24. Connect “P” leads to mags. 25. Connect tachometer shaft. 26. Connect engine breather flex. tube. 27. Connect oil pressure gauge line. 28. Connect primer lines. 29. Connect oil sump drain lines. 30. Install cylinder head temp. bulb and adapter in top of #1 cylinder. 31. Install new or modified exhaust mufflers P/N 108-6222702-2. 32. Install tail exhaust pipes. 33. Install exhaust heat muff shrouds. 34. Install lower cowl P/N 108-6021401-78 – connect air flex tubes from cowling to muffs and muff to carb. air box and cabin heat box. 35. Install new nose cowl P/N 108-6021401-76 36. Install transfer tube in engine prop shaft. 37. Install propeller 2A31C21/84S-8. 38. Install spinner P/N 0752004. 39. Install manifold pressure gauge and cyl. Head temp. gauge in panel. Location optional. 40. Connect cyl. Head temp. wires to temp. bayonet and route through firewall with other wiring and connect to gauge. 41. Remove plug ant rear of intake manifold spider and install fitting. Install firewall fitting and connect manifold pressure lines. 42. Install original top cowl. 43. Weigh Aircraft. Empty weight C.G. range is: With standard baggage at 42” +10. to + 16.0 With aft baggage compartment +10. to +13.7 If empty wt. C.G. fails within this range, no ballast is required. If empty wt. C.G. falls outside this range, ballast may be required to bring C.G. to proper limits in Spec. A-767. Make proper entry of weight and balance information in the weight and balance section of the Aircraft Records. Equipment list should be revised to reflect new items installed. 44. Run up aircraft and check for oil leaks and proper operation according to Pilot’s check list and approved Flight Manual. 45. Make final check of all parts installed for conformity to Installation Diagrams. Complete ACA337 Repair and Alteration form and make log book entry to show the complete installation. 46. F.A.A. approved Flight Manual, Appendix B, shall be attached to and become a part of Stinson Airplane Flight Manual dated 29 December 1948, for Model 108-3. Page 3 Bulletin 269 PARTS REQUIRED FOR CONVERSION OF 108-3 STINSON TO 6A-335-B1 ENGINE Part No. Quantity Name 6A-335-B1 1 Engine Assy. 2A31C21/84S-8 1 Propeller Assy. 10-4674 1 Carburetor 0752004 1 Spinner Assy. - Cessna AN509-10R-16 12 Screws AN960-10 12 Washers AN365-1032 12 Nuts 3V700-1075-C-60 1 Governor Control - Vernier U-108-6221511 1 Bracket Assy. AN3-7 2 Bolt AN960-3 2 Washer AN365-1032 2 Nut AN741-9P 1 Clamp U-108-6221512 1 Bracket Assy. AN470-4-4 4 Rivet 0750138 1 Arm-Prop. Control - Cessna AC755-4-2-8 1 Clamp AN742-D14 1 Clamp 210453 1 Governor - Woodward 108-6021401-78 1 Bottom Cowl Assy. - Conversion 108-6021401-76 1 Nose Cowl Assy. U-108-6022421 1 Fairing 6022431 1 Lip 6222801 1 Cuff 6201003-6 1 Clamp 6201003-8 1 Clamp 108-6212000-1 1 Mount Assy. 3062023-1 1 Bracket Battery Box 3062023-2 1 Bracket Battery Box 3062023-3 1 Bracket Battery Box 3062020 1 Inst. Battery Box (Dwg.) 3062024 1 Frame Battery Box 1 FAA Approved Flight Manual 1 Manifold Pressure Gauge 1 Cyl. Head Temp. Gauge AN5546-1 1 Thermocouple 1 Thermocouple Lead AN4076-1 1 Thermocouple Adapter 108-6202000-2 1 Dwg. – Inst. – Power Plant U-108-6221510 1 Dwg. – Gov. Control Inst. 3062000 1 Fuselage Elect. Dwg. UNIVERSIAL AIRCRAFT INDUSTRIES R. A. WILLIAMS Manager, Repair Division FAA Approved _______________________________ Rev. 5/6/2005

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