About Us

About Us

US Engine Production has been a trusted provider of new and remanufactured high-quality engines at competitive prices for over 35 years. Our production facility is 180,000 square feet and located in Vassar Michigan, with corporate operations in Lindenhurst New York. USEP produces over 5,500 diesel and gas engines each year in all makes and sizes and inventories approximately 1,200 units. We offer a flexible core return policy, that allows up to 30 days to return your core and we pay the return freight. Many units require no up-front fee and have an average lead time of 3 – 5 business days. We also offer transmissions, parts and accessories such as fuel injectors, fuel pumps, water pumps and turbochargers. We believe that lasting business relationships are based on mutual trust and respect, and that customer service is of the utmost importance. Our workplace core values demand that our employees conduct themselves with integrity, accountability, diligence and discipline. Given the opportunity, you will find us to be a trustworthy partner.



Our Manufacturing Process

Engine Blocks - US Engine Production only uses blocks that pass our strict quality inspection process. Every cylinder is bored to within .004 of the finished size. Next, we use a diamond hone to ensure bore geometry is held within 200 millionths of an inch. Every block is then subjected to a surface finish test to measure the roughness and plateau finish of the cylinder wall. (With today’s lightweight motor oils and low-tension oil rings, this step is critical for achieving the proper ring seal.) Blocks are checked and align honed through the main bearing bores to align and size to the proper factory specifications. This process is critical to maintain uniform oil clearances and good oil pressure. After all machine work to the block is complete, it is then cleaned until completely grit free. We scrub each cylinder with soap and water and clean all oil galleys with a high-pressure wash. 

Engine Heads - Valve seats are cut on the latest state of the art equipment, forming all three angles at once. This ensures the correct seat width and connectivity for good valve seal and heat transfer. Once the head is machined, it is ready to be assembled to factory tolerance by using high temperature valve stem seals, valve springs, and hardened valve locks. Each valve/spring combination is individually tested to provide the correct spring pressure and vacuum-tested to ensure a tight valve seal. 

Crank/Cam Shafts - Crankshafts are re-ground to factory tolerance. The crankshaft is then micro-polished to exceed the original finish, ensuring proper bearing lubrication. A final wash is done to ensure that every crank is clean. Cam lobes are reground to the same specifications as the original. Cams are then Parkerized to increase the life of the camshaft and lifters and to prevent corrosion of metals.

Rods – Every rod goes through a rigorous restoration process. After the rods are chemically cleaned, the bores are machined to original tolerances for size and surface finish. The rods are then checked for bend and twist. Any rod not meeting our exacting tolerance is discarded. All bushings are 100% replaced.

Testing and Final Inspection - Following assembly, the engine is put through a vigorous load-bearing run on the DYNO TEST Machine for over an hour to test the quality, after which it heads to our lead technician for final inspection and approval for release.

Warranty - To guarantee the satisfaction of our clients, we provide a one year Unlimited Mileage, parts-only warranty on all of our engines.

Environment - US Engine Production assembles each engine in a clean and controlled environment. Constant supervision, testing, and cross-department auditing ensures every engine gets the same attention to careful assembly and results in consistent superior quality.