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Clean, efficient, dependable and durable, Cummins engines are found in nearly every type of vehicle and equipment on earth; from emergency vehicles to 18-wheelers, berry pickers to 360-ton mining haul trucks. You'll also find Cummins everywhere there's water, with a full line of recreational and commercial marine diesels. APM offers a complete line of Genuine Cummins engines & parts, as well as replacement parts.

Detroit Diesel®

Detroit Engines perform at their peak for miles and miles with best-in-class fuel economy and low-cost maintenance and service. Every step of Detroit Diesel's design, testing and support process builds quality into every engine that bears the Detroit name. APM offers a complete line of remanufactured Detroit Diesel engines and replacement parts.


Trucks built to work. On the road or at the jobsite, you can count on Mack to get the job done every day. Macks are lighter and fuel-efficient, so they can do more. And they've got the power you need to take on tough jobs. APM offers a complete line of remanufactured engines and replacement parts for Mack.

Welcome to APM Heavy Duty: Your Engine Parts Store & Machine Shop

APM Heavy Duty is a division of APM Inc., a family-owned business operating in Metro Atlanta since 1961. We have an extensive inventory of engine parts and offer a variety of services, including complete engine rebuilding, crankshaft grinding, as well as cylinder boring and honing.

Our experts will be with you every step of the way, even after the final purchase. Contact us with any questions and remember to keep us in mind for all of your rebuilding needs. .

Why Choose APM?

In 1961, WWII veteran Jim Ratteree opened Automotive Precision Machinery, Inc. For over 50 years, he has stood at the helm of APM, ensuring that product quality is never compromised, customer satisfaction is the top priority and daily operations remain efficient. In 1982, Jim's son Charlie Ratteree joined the family business and has worked alongside his father ever since.

As the company grows, APM remains true to its founder's ideals of top-notch products and service. The expert technicians offer years of experience, and each rebuilt engine is subject to rigorous testing, inspection and is strictly requalified so each part fits within OEM-level tolerances.

E-mail or call us toll-free 1-800-282-9319 so we may assist you with your engine rebuilding requirements.

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