Ford Motor Co. manufactured the Powermaster 841 farm and agricultural tractor from 1957 through 1961. The 841 was still painted in the gray and red colors used on previous models, but the 841 was improved over the 8N models. The 841 was available only in two-wheel drive form. All 841 models were produced at Ford’s Highland Park, Michigan, assembly plant.
The standard engine in the 841 is an inline overhead-valve four-cylinder displacing 172 cubic inches. There is one intake valve and one exhaust valve for each cylinder. The cylinder bore is 3.90 inches and the crankshaft stroke is 3.60 inches. The compression ratio is 7.5-to-1. The power output of this engine is 62.6 horsepower at 2,000 rpm and 166 foot pounds of torque at 1,600 rpm.
The 841 has a manual transmission with four forward gears and one reverse gear. The maximum speed in first gear is three miles per hour, 4.5 miles per hour in second gear, 6.8 miles per hour in third and 13.6 miles per hour in high gear. The maximum speed in reverse is 3.9 miles per hour. The transmission holds 6 quarts of SAE 80 oil. An auxiliary gear box was available that provided four under-drive gears and four over-drive gears to the standard direct-drive transmission. The speed in the forward gears range from 2.5 miles per hour in low gear to 15.5 miles per hour in high gear. The speed in the reverse gears ranged from 2.6 to 5.8 miles per hour.
The wheelbase of the 841 tractor is 74.5 inches. The operating weight is 3,487, while the weight with full ballast installed is 6,985 pounds. The tires on the 841 are agricultural-type. The front tire size is 6-16 inches, while the rear tire size is 12-28 inches. The front and rear tread width, or track, was adjustable to accommodate different widths of crop rows. The range of adjustment for the front tread is 52 through 80 inches, while the range on the rear tread is 52 to 76 inches.
The firing order of the 841 engine is one, two, four and three. The spark plug gap for gasoline models should be adjusted to .027 inch, while the plug gap in propane-powered models should be set to .030 inch. The timing mark is found on the engine flywheel and should be set to four degrees behind top dead center. The breaker point gap needs to be set to .025 inch.