Technical Manual C3 (TM 5-2805-259-24P) Model 4A084-2 20HP Gas Engine
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Technical Manual C3 (TM 5-2805-259-24P) 4A084-2 20HP Engine
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This Technical Manual Change 3 for TM 5-2805-259-24P covers the Military Standard Model 4A084-2 20HP Gasoline Engine, identified under FSN 2805-952-3926, and is dated February 1972. This change was issued for the original TM 5-2805-259-24P manual dated January 9, 1969, making it an important companion document for collectors, researchers, restorers, and anyone building a serious reference library around U.S. Army utility engines, support 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 parts information, special tools data, and maintenance support 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 Military Standard Model 4A084-2 20HP Gasoline Engine
The MS Model 4A084-2 20HP Gasoline Engine belongs to the broader family of military small-engine, utility-power, and support equipment. As identified by its nomenclature, it is a 20 horsepower gasoline engine, placing it squarely in the support side of Army operations rather than in the category of conventional weapons or combat vehicles.
Engines in this class were associated with auxiliary power, portable equipment, mechanical support systems, and a wide variety of field or shop applications where dependable gasoline power was required. That makes this manual change especially interesting from a historical standpoint. Instead of documenting a weapon system directly, it preserves the technical side of the engines that powered the Army’s supporting equipment behind the scenes.
For collectors, that gives this item added appeal. It represents the maintenance and supply side of Cold War military readiness and fits especially well in collections focused on military engines, utility equipment, mechanical support systems, and field-service hardware. The inclusion of FSN 2805-952-3926 also 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 5-2805-259-24P, it belongs to the repair parts and special tools side of Army documentation. In practical terms, a manual change like this is especially relevant for updated service information related to:
- equipment identification and nomenclature
- repair-parts reference
- special tools documentation
- support and maintenance information
- corrections or revisions to the original manual
- archival and restoration research
Since this is Change 3 for the January 9, 1969 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 February 1972 places this publication in the later Cold War period, when the U.S. military maintained extensive technical literature covering not only weapons and vehicles, but also the engines and support equipment required to sustain field operations. Manuals and change sheets like this reflect a period when Army documentation extended into every part of the logistical chain, including utility engines, maintenance equipment, and service-support systems.
For collectors and historians, this manual change is especially relevant to subjects such as:
- Cold War U.S. Army technical manuals
- military gasoline engines and utility-power equipment
- repair parts and special tools documentation
- Army maintenance and service support systems
- dated military paperwork and manual changes
Because it covers a specialized support engine 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 5-2805-259-24P covering the Military Standard Model 4A084-2 20HP Gasoline Engine, identified under FSN 2805-952-3926 and dated February 1972. It was issued for the January 9, 1969 printing of the original technical manual.
It is especially well suited for:
- U.S. Army technical manual collections
- Cold War engine and support-equipment displays
- military utility-engine collections
- museum exhibits on Army maintenance and service systems
- archive and research libraries focused on U.S. military technical publications
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 5-2805-259-24P. For researchers, it helps document the continued parts-support and service history of the Military Standard Model 4A084-2 20HP Gasoline Engine. For museums, it adds context to the administrative and technical side of military support equipment that is often overlooked in favor of more visible hardware.
Ideal For
This manual is a strong fit for:
- U.S. Army technical manual collections
- Cold War engine and support-equipment displays
- military utility-engine and generator collections
- museum and archival reference libraries
- collectors of military paperwork and dated technical publications
Approx length 10", Approx width 8", Approx height .1", Approx weight .2lbs.
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