This Technical Manual Change 3 for TM 5-8081 covers the Johnson Model RDM-10, RDM-11, RDM-12, and RDM-14 Outboard Motor, identified under FSN 2805-376-9171, and is dated August 1969. This change was issued for the original TM 5-8081 manual dated April 23, 1957, making it an important companion document for collectors, researchers, restorers, and anyone building a serious reference library around U.S. Army watercraft equipment and Cold War technical literature.
Unlike a full base manual, this item is an official Change 3 publication. That means it was issued to revise and update the original manual rather than replace it outright. For collectors, that matters. Army manuals were routinely kept current through numbered changes, and surviving change issues help document how operating guidance, maintenance information, and service procedures evolved while the equipment remained in use. In that sense, this is not just a supplemental insert. It is part of the actual service history of the manual.
The Johnson RDM-Series Outboard Motors
The Johnson Model RDM-10, RDM-11, RDM-12, and RDM-14 Outboard Motors belong to the broader family of military small-boat, utility, and field-support equipment. As identified by their nomenclature, these were outboard motors, placing them squarely in the support side of Army operations rather than in the category of conventional weapons or combat vehicles.
Equipment in this class was associated with lightweight military watercraft, utility boats, engineer boats, and support craft where compact, reliable propulsion was essential. In military service, outboard motors like these supported transport, reconnaissance, river-crossing work, and general field mobility on inland waterways and other operating environments where larger craft were not practical.
For collectors, that makes this manual change especially interesting because it documents the technical side of Cold War military support equipment rather than more commonly seen combat hardware. It also has strong crossover appeal for anyone interested in military boating equipment, outboard motors, and U.S. Army field-support systems. The inclusion of FSN 2805-376-9171 adds cataloging value for collectors who prefer manuals with a specific government stock-number reference rather than only general nomenclature.
What This Manual Change Covers
Because this publication is a change to TM 5-8081, it belongs to the operation and maintenance side of Army documentation. In practical terms, a manual change like this is especially relevant for updated service information related to:
Since this is Change 3 for the April 23, 1957 issue, it is especially useful to collectors who want to pair it with the original base manual and preserve the manual as it was actually updated and used in service.
Historical Significance
The date August 1969 places this publication in the Cold War and Vietnam-era period, while the original April 23, 1957 issue ties the manual back to the earlier Cold War Army. That gives this change added historical interest because it reflects the continued service life of military outboard equipment and the Army’s effort to keep technical literature current as the equipment remained in operational use.
For collectors and historians, this manual change is especially relevant to subjects such as:
Because it covers a family of outboard motors rather than a more common tactical vehicle or weapon system, it also adds variety to collections that already include standard ordnance or maintenance manuals.
About This Item
This listing is for Technical Manual Change 3 for TM 5-8081 covering Johnson Model RDM-10, RDM-11, RDM-12, and RDM-14 Outboard Motors, identified under FSN 2805-376-9171 and dated August 1969. It was issued for the April 23, 1957 printing of the original technical manual.
It is especially well suited for:
Because manuals were working documents, surviving examples are valued not only for their content, but also for their connection to real military maintenance and support practice.
Why This Manual Matters
Many military manuals focus only on base editions, but change sheets are a major part of how Army documentation was actually maintained in service. This item adds a layer of authenticity and completeness that a base manual alone does not always provide.
For collectors, it is a useful companion piece to the original TM 5-8081. For researchers, it helps document the continued operating and service history of the Johnson RDM-series outboard motors. For museums, it adds context to the administrative and technical side of military small-boat equipment that is often overlooked in favor of more visible hardware.
Ideal For
This manual is a strong fit for:
Approx length 9", Approx width 6", Approx height .2", Approx weight 1lbs.
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