Atlas-Imperial Engine Co

Atlas-Imperial model numbers are a combination of four different designations: cylinder number, block type, application, and cylinder volume. Block types were either "H" heavy-duty engines with individual cylinders and heads; or "E" en-block engines with a solid block and individual heads. Application could be "M" (marine), "S" (stationary), or "N" (industrial). Cylinder volume is the cubic volume in inches of a single cylinder. For example, a 4HM763 Atlas-Imperial is a marine heavy-duty diesel with four cylinders and a volume of 763 cubic inches per cylinder.

All Atlas-Imperial Engine Co manuals.

Known Remaining Engines

Click on the headings to sort table by column. Names struck out designate an engine's original provenance prior to removal for display.
Model Serial Engine Bore Stroke Cyl HP RPM Owner Originally Currently Location
6HM2124 12111 Alpo 13" 16" 6 400 300 Toppilan Möljä Oy tugboat tugboat Oulu, Finland
4HM464 10477 Ilwaco Fishboat 7½" 10½" 4 70 400 Wayne Thackery fishboat display Brooks, OR
4HM282 Arro 6½" 8½" 4 60 600 Mike Evans yacht yacht Port Angeles, WA
6HS2124 12580 Big Swan Pump 13" 16" 6 300 300 Big Swan Drainage and Levee District marine drainage pump Winchester, IL
3HM763 Brady's 3HM763 9" 12" 3 75 325 Brady Ferguson display Clinton, WA
4HM763 Brady's 4HM763 9" 12" 4 110 325 Brady Ferguson display Clinton, WA
3HS464 9663 John's Bucyrus 7½" 10½" 3 75 325 John Tucker display Bellingham, WA
4HM282 Buster 6½" 8½" 4 60 600 Stuart Marshall tugboat yacht Lopez Island, WA
3HM464 8018 MTM's 3HM464 7½" 10½" 3 75 400 Motor Transport Museum marine display Campo, CA
4HS763 Coal Creek Dredge 9" 12" 3 75 325 National Park Service Dredging Dredging Coal Creek, AK
3HM681 8043 Childs Brothers Sawmill 8½" 12" 3 65 325 Roots of Motive Power fish boat then sawmill display Willits, CA
3HS282 9827 Mark's 3HS282 6½" 8½" 3 30 475 Mark Utlaut Scappoose, OR
3HS464 Mark's 3HS464 7½" 10½" 3 75 325 Mark Utlaut Scappoose, OR
4HM28 20120 Cowichan Bay Museum 6½" 8½" 4 60 600 Cowichan Bay Museum tugboat display Cowichan Bay, B.C.
3HM464 9598 Argo 7½" 10½" 3 65 325 Columbia River Maritime Museum fishboat display Astoria, OR
3HM282 20372 CRMM 6½ 6½" 8½" 3 45 600 Columbia River Maritime Museum display Astoria, OR
2HM282 Dave's 2HM282 6½" 8½" 2 30 600 Dave Milholland marine display Anacortes, WA
3HM282 Dave's 3HM282 6½" 8½" 3 45 600 Dave Milholland marine display Anacortes, WA
4HM282 Dave's 4HM282 6½" 8½" 4 60 600 Dave Milholland marine display Anacortes, WA
3HM282 11152 Dunlin 6½" 8½" 3 45 600 Chug Leede tugboat yacht Seattle, WA
4HM763 11932 Elmore 9" 12" 4 110 325 Henning tugboat yacht Port Townsend, WA
6HM2124 Ever 13" 16" 6 400 300 National Museum of American History tugboat display Washington, D.C.
6HM3358 Flywheelers' 6HM3358 15" 19" 6 600 300 Florida Flywheelers Antique Engine Club display Ft. Meade, FL
4HS763 Fred’s Atlas Bucyrus 9" 12" 4 110 325 Fred Dorfeld Custer, WA
4HS763 12111 Geo's Bucyrus 9" 12" 4 110 325 Geo unknown display Shelton, WA
3HM464 11221 Shenandoah 7½" 10½" 3 65 325 Harbor History Museum marine museum display Gig Harbor, WA
Intrepid 7½" 10½" James Waltz tugboat yacht Everett, WA
4HM1125 12439 Irene 10½" 13" 4 155 350 Jimmy and Olive tugboat yacht Seattle, WA
6HM2124 James O'Brien 13" 16" 6 400 300 tugboat tugboat Picton, New Zealand
4HS763 Jeremy's 4HS763 9" 12" 4 110 325 Jeremy Weiks generator display Tumwater, WA
6HM2124 11811 John Arthur 13" 16" 6 400 300 George Coates tugboat yacht Chesapeake City, MD
3HM763 8403 Josh's Engine 9" 12" 3 100 300 Josh display El Cajon, CA
3HM1021 9291 Kittie B 10" 13" 3 100 325 David Baxter tugboat yacht Orcas Island, WA
3HS282 Duryea Ice Plant 6½" 8½" 3 55 600 Long Island Antique Power Association compressor display Riverhead, NY
6HM1558 HMNZS Manawanui 11½" 15" 6 320 325 Whangarei Stationary Engine Club tugboat display Whangārei, New Zealand
4HM282 Mark's 4HM282 6½" 8½" 4 60 600 Mark Utlaut marine display Scappoose, OR
6HM2124 12121 Merikarhu 13" 16" 6 400 300 Town of Hamina tugboat tugboat Hamina, Finland
3HM763 Mike's 3HM763 9" 12" 3 75 325 Mike Perry display Portland, OR
4HM1021 11084 Mystic Seaport 10" 13" 4 135 350 Mystic Seaport Mystic, CT
4HM763 8390 Newt 9" 12" 4 110 325 Erik Rasmussen & Laura Phillips tugboat liveaboard Seattle, WA
8003 Smithsonian 1 9" 12" 3 55 320 National Museum of American History marine display Washington, D.C.
6HM2124 Normandea 13" 16" 6 400 300 Jarmo tugboat Putikko, Finland
6HM1558 12311 Palomar 11½" 15" 6 320 325 Sean tugboat yacht East Sound, WA
6HM2124 Poitsila 13" 16" 6 400 300 Tom Korttila tugboat Helsinki, Finland
6HM1021 9401 PSATMA's 6HM1021 10" 13" 6 200 325 Puget Sound Antique Tractor & Machinery Association marine museum display Lynden, WA
4HM282 20369 PSATMA's 4HM282 6½" 8½" 4 60 600 Puget Sound Antique Tractor & Machinery Association display Lynden, WA
6HM2124 12129 Purha 13" 16" 6 400 300 Veli-Matti Oinonen tugboat tugboat Helsinki, Finland
6HM2124 11814 Ready 13" 16" 6 400 300 Mark Utlaut tugboat display Scappoose, OR
6HM1558 Rival 11½" 15" 6 300 300 Vista Antique Gas & Steam Engine Museum garbage scow display San Diego, CA
4HM528 Vigorous II 8" 10½" 4 85 450 Ron Brazell yacht display Vallejo, CA
4HM528 22067 Delta Ferryboat 8" 10½" 4 85 450 Ron Brazell ferryboat display Vallejo, CA
10843 Ron's Gas Engine 6½" 8½" 6 80 Ron Brazel Vallejo, CA
3HS282 8328 Shafer Museum's 3HS282 6½" 8½" 3 50 Shafer Museum display Winthrop, WA
6HM464 9547 Sobre las Olas (port) 7½" 10½" 6 120 400 Sean Connoly & Jeff Grates yacht yacht Ventura, CA
6HM464 9548 Sobre las Olas (starboard) 7½" 10½" 6 120 400 Sean Connoly & Jeff Grates yacht yacht Ventura, CA
6HM2124 12136 Driftwood 13" 16" 6 400 300 Queen Charlotte Lodge tugboat charter Richmond, BC
4HS282 Spike's 4HS282 6½" 8½" 4 60 600 Spike Blaine display Na'alehu, HI
6HM763 11321 Sultana 9" 12" 6 160 325 Levi cannery tender charter Hoonah, AK
3HM282 Sydney Heritage Engine 6½" 8½" 3 50 600 Sydney Heritage Fleet fishing boat display Sydney, Austrailia
6HM1021 11462 Taconite (port) 10" 13" 6 220 350 Taconite Classic Yacht Charters yacht charter Victoria, BC
6HM1021 11461 Taconite (starboard) 10" 13" 6 220 350 Taconite Classic Yacht Charters yacht charter Victoria, BC
3HM763 11490 Telegraph Cove 9" 12" 3 70 300 Telegraph Cove Lodge generator display British Columbia
6HM1558 9834 Thea Foss (starboard) 11½" 15" 6 275 275 Saltchuk yacht yacht Seattle, WA
6HM1558 9833 Thea Foss (port) 11½" 15" 6 275 275 Saltchuk yacht yacht Seattle, WA
6HM2124 12126 Tolvan 13" 16" 6 400 300 Bengt Fredriksson tugboat Turku, Finland
4HS282 TSGA's Engine 6½" 8½" 4 70 650 Tuckahoe Steam & Gas Association display Easton, MD
3HM282 9383 Danny's 3HM282 6½" 8½" 3 65 Danny Felterman display
6HS2124 12916 SSM's 6HS2124 13" 16" 6 400 300 SABESP Sanitation Museum display São Paulo, Brazil
4HM1021 10290 Asa Cotton Gin 10" 13" 4 135 325 J.R. Smith Tatum, TX
Eureka Mining Company 10" 13" 6 Eureka Mining Company Barron, WA
6HM1558 12309 Urger 11½" 15" 6 300 300 New York Canal Corporation tugboat museum vessel Waterford, NY
6HM3358 Velero IV 15" 19" 6 600 300 research research Cordova, AK
4HM1125 12479 Vivian 10½" 13" 4 155 350 Bob Stevens fishboat yacht Astoria, OR
4HM763 Wakefield Cannery 9" 12" 4 110 325 derelict Port Wakefield, AK
4HS763 11308 Waterfall #1 9" 12" 4 120 400 Waterfall Cannery Resort generator generator Craig, AK
4HS1125 12880 Waterfall #2 10½" 13" 4 160 360 Waterfall Cannery Resort generator generator Craig, AK
4HS1125 12881 Waterfall #3 10½" 13" 4 160 360 Waterfall Cannery Resort generator generator Craig, AK
4HM763 8251 Westward 9" 12" 4 110 325 Bill Baily yacht yacht Port Townsend, WA
6HM1558 11977 Yellowfin (starboard) 11½" 15" 6 320 325 Pacific Yellowfin Charters freighter yacht Vancouver, BC
6HM1558 11976 Yellowfin (port) 11½" 15" 6 320 325 Pacific Yellowfin Charters freighter yacht Vancouver, BC
4HS464 9779 Zagray Farms Button Factory 7½" 10½" 4 70 400 Zagray Farm display Colchester, CT

Late Model Engines

Click on the headings to sort table by column. Names struck out designate an engine's original provenance prior to removal for display.
Model Serial Engine Bore Stroke Cyl HP RPM Owner Originally Currently Location
6ES668 Junkyard Crane 9" 10½" 6 240 600 Hendrik Ido Ambacht Junkyard crane crane Hendrik Ido Ambacht, Netherlands
6ES668 Wellman Engineering Crane 9" 10½" 6 240 600 crane crane
6EN668 50051 Fred's 6EN668 9" 10½" 6 240 600 Fred Dorfeld crane Custer, WA
45M5X8 Gowanus Bay 9" 10½" 8 600 720 Rob Iaucci tugboat tugboat Kingston, NY
45M5X8 Hoga (YT-146) 9" 10½" 8 600 720 Arkansas Inland Maritime Museum tugboat museum vessel Little Rock, AR
45M5X8 Hudson 9" 10½" 8 600 720 tugboat St. Croix
8EN668 20483 Independence Mine 9" 10½" 8 275 514 generator generator Hatcher Pass, AK
8KMT668DR 12980 Columbia 9" 10½" 8 550 750 Columbia River Maritime Museum lightship museum vessel Astoria, OR
45-MX Relief 9" 10½" 8 600 720 US Lighthouse Society lightship museum vessel Oakland, CA
6EN668 Navy Cranebarge 9" 10½" 6 240 600 US Navy crane crane Honolulu, HI
45M5X8 Smithsonian 3 9" 10½" 8 600 720 National Museum of American History display Washington, D.C.
6ES668 Pago Pago Cranebarge 9" 10½" 6 240 600 Pago Pago Shipyard crane crane Pago Pago, Samoa
45MX ST-2130 9" 10½" 8 600 720 Bruce Morelan tugboat yacht Westport, WA
4EH253 Caterpillar 6¼" 8¼" 4 tractor tractor
6HM253 12743 Vagabundo 6¼" 8¼" 6 135 900 Jerry & Tanya motor-sailer yacht Seattle, WA
6ES668 Vietnam Cranebarge 1 9" 10½" 6 240 600 crane crane Ho Chi Minh City, Vietnam
6ES668 Vietnam Cranebarge 2 9" 10½" 6 240 600 crane crane Ho Chi Minh City, Vietnam