Stinson 108 Technical Info
Page Created 1/31/99
Gathered here are technical tidbits that
I learned while restoring my Stinson. Some are hard-to-find facts,
some are sources for hard-to-find parts, others are simply my solutions
to challenges found during the restoration. Also included are technical
tips from other Stinson 108 restorers and a selection of technical documents.
Circular 23-27 - FAA guidance on parts and materials substitution for
vintage aircraft. Added 7/17/09.
A-767 - The Type
Certificate Data Sheet for the Stinson 108 series, Revision 28, dated October 1,
2011 in PDF format, requires
Added 2/3/2004, Updated 12/30/11.
E-238 - The Type
Certificate Data Sheet for the Franklin 150 and 165 engines, Revision 14, dated
April 30, 2013 in PDF format, requires
Bodell Brakes -
Skybound, Inc. offers the Bodell wheel and brake system for the Stinson.
Click here for a scan (in PDF format) of the
brochure from Skybound, installation instructions. drawings, and a price list
that was current as of May 2011. Added 6/22/11.
Bulletin SB3-03. Differential Pressure Test and Borescope Inspection
Procedures for Cylinders. Current procedures for a compression check,
supersedes M84.15. Though bulletin is from Continental, principles
apply to all piston engines.
Policy Statement on Shoulder Harness Retrofits - A recent policy permits the
installation of shoulder harnesses in older aircraft as a "minor change."
Parts and Price Catalog - Dated April 20, 1968. 25 pages, 14 MB PDF file.
This is a scan courtesy of Larry Wheelock. Printed by Tuscarawas County
Aviation, Inc, which was then a Franklin distributor. Includes some handwritten
notes by Larry. Added 1/5/12.
Franklin 165-B3 Service Parts List - Scanned by Sean Mullaly,
reproduced and posted with permission, courtesy of Univair.
Franklin Engine Service Manual - 150 and 165 - Scanned by Sean
Mullaly, reproduced and posted with permission, courtesy of Univair.
Met-L-Prop Installation Drawing. Univair has revised the drawing
for the installation of the McCauley prop and spinner on the Stinson Voyager.
Bolt torque values have changed.
is a PDF file, requires Adobe Acrobat. Added 6/11/09.
Produced Parts - FAA guidance on a complex topic. This is a PDF copy
of a 1993 Memorandum from the FAA Assistant Chief Counsel for Regulations.
Stinson Parts Catalog for Voyager and Flying Station Wagon - Scanned by
Sean Mullaly, reproduced and posted with permission, courtesy of Univair.
Stinson Service Letter 81,
Revision A, dated March 13, 2009, provides updated information
for battery installations in our Stinsons. Requires Adobe Acrobat. Added
9/15/2005. Updated 3/1/11.
Technical Information and Tips
Back to the
Hangar 9 Aeroworks Main Stinson Page
Conversion. Joe Kendzicky has installed the Stan Bedford alternator
conversion on his 108. Here are photos and documents.
and Use of Cable Tensiometers. Rigging the control cables should
be done with the aid of a cable tensiometer. Rich Tweedie provides
info on using these tools and specific tips for rigging the cables on the
Stinson 108. Updated 4/12/99.
Stack Avionics. Joe Kendzicky has designed a custom instrument
panel that includes an avionics "center short stack." See how he
did it. Updated 3/14/04.
Breaker Panel. The original circuit breakers are of the automatic
resetting type and are hidden behind the panel. I switched to modern
breakers and made a subpanel to avoid non-original holes in the face of
the main panel. Learn what I did here.
Cleveland Brake Conversion - rear mounting of caliper for a cleaner look.
Added 8/8/07. Updated 1/24/13.
Brake Conversion Wheel Pant Pattern - a pattern for cutting the wheelpants
to clear Cleveland Brakes - using the standard forward position.
Column Universal Joint Boots. After 50 years, the original rubber boots
on the universal joints on each control yoke end will need to be replaced.
Here's where you can find replacements and what is involved in doing the
job. Updated 3/4/99.
Installation. Here's a method to install an ELT with a hidden
antenna. Updated 6/6/99.
a summary of known alternatives to the Franklin 150 and 165 as well as news of
new production Franklin engines and parts.
Cable Alert - Many Stinsons have
a dangerous situation involving flap control cable misalignment that could
lead to loss of control of the airplane. Inspection and correction
is easy. Thanks to Rich Tweedie for this very important tip. New
Valve. An improved fuel selector valve is now available
from Univair. Here are the details.
Added 11/9/99. Updated 12/14/11.
Tubing. Here are some trouble spots that you should inspect and
methods for repairing the tubing. Added 12/13/99.
Engine Oil Dipstick Alert. Stinson owner Jack Smits reports on
the potentially dangerous failure of his oil dipstick. Added
Franklin 165 Heavy Case vs. Light Case. How can I tell if my F-165 has
the heavy case. Added 7/16/10.
220. Rich Tweedie's notes on installing and operating the Franklin
220 in his 108-2, N175C. Added 4/9/99.
220, Part 2. Rich Tweedie's baffles and tandem oil cooler installation.
Panel. Those who wish to restore the instrument panel of 108-1,
-2, and -3 aircraft to original condition may find my sources of parts
helpful. Updated 3/7/11.
Pacific Oil Cooler Installation 337 (page 1) - Bill Beerman supplied a
copy of the 337 form for installation of the Pacific Oil Cooler on his Stinson.
Click for here for page 2.
Penetrating Oil. Machinists Magazine
reports that an effective penetrating oil for removing rusted bolts and screws
is a 50/50 mix of acetone and automatic transmission fluid. This homebrew
proved better than commercial products such as Liquid Wrench and Kroil.
Pedal Torque Tube Removal. Removing the torque tubes for the
rudder pedals is a little tricky. Here's how to do it.
Shock Strut Overhaul. Info and photos on overhauling the Stinson
landing gear shock absorbers.
Added 12/24/07, updated
Woodwork. In addition to the "woody" panels in the Flying Station
Wagon, wood is used in the cabin and baggage compartment of all 108 models.
Here's information to help in restoring the woodwork in your Stinson. Updated