About Us

RJ’s Diesel Repair Inc.

RJ's Diesel Repair Inc.'s preventive maintenance services feature oil changes, including oil, oil filter, fuel filter, and air filters. We grease the chassis and top off all fluids. We also offer thorough vehicle inspections and will examine your truck for wear and tear.

We are proud to use Jasper™ engines and transfer cases. Every Jasper engine comes with a 3-year, 100,000-mile warranty. Plus, we overhaul tractor-trailers and mid-size pickup trucks.

Our state-of-the-art computer diagnostics detect engine problems from brands like Caterpillar™, Cummins™, Mack™, Detroit Diesel™, and Navistar™.

We offer full A/C services on all makes of trucks. We also make custom Gates™ hydraulic lines while you wait and carry a full line of Gates hydraulic fittings. We have Weatherhead hydraulic lines as well. Are you in need of tires for your truck or equipment? We carry many name-brand truck tires for pickups to tractor-trailers, including off-road equipment. We now offer a full transmission flush for light-duty vehicles.

Semi Truck
Tractor Fleet

RJ’s Diesel has earned the blue seal of excellence from National Institute for Automotive Service Excellence.


RJ's Diesel Repair Inc.
  • Address 62 Voluntown Rd. Pawcatuck, CT 06379
  • Phone (860) 599-3088


For RJ's Servicing
  • Mon - Fri Open 8:00 am - 5 pm
  • Saturday Closed All Day
  • Sunday Closed All Day
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