Interstate-McBee is more than just a supplier of replacement parts. Manufacturing is a significant part of our operation. In fact, we’ve been remanufacturing diesel injectors since 1947 and manufacturing new injectors and fuel injection components since the 1950s. Additionally, Interstate-McBee has been manufacturing gaskets in-house for over 15 years using the highest quality raw materials available for diesel and natural gas engines, including Caterpillar®, Cummins®, Detroit Diesel®, Navistar®, and Waukesha® applications.

Fuel Injection

Dating back to the 40’s, Interstate-McBee specialized in remanufacturing Detroit Diesel® fuel injectors.  Remanufacturing at Intersate-McBee has grown significantly since then to cover a wide range of OEMs in various markets, and now includes the manufacturing of new injectors and fuel injection components as well.

Manufacturing and remanufacturing at our facilities follow a meticulous process starting with the best possible raw materials all the way through to assembly and comprehensive testing.

Interstate-McBee Manufacturing Process Illustration

Raw Materials

The emphasis Interstate-McBee puts on acquiring high quality steel can’t be overstated.  Using the absolute best quality raw materials is what makes the rest of our manufacturing process possible, and it’s a big part of why we’ve become known for producing premium products.

  • We only work with certified steel
  • The material must have a high cleanliness
  • All material is checked for ideal chemical composition
Interstate-McBee Raw Materials

Green Machining

In our facilities, we utilize several aspects of green machining such as Turning, Milling, Drilling, ECM (Electro Chemical Machining), Wire EDM, and Swiss Machining.  When it comes to green machining, we’re proud to be associated with some of the most respectable brands in the industry:

  • Hardinge
  • Haas
  • Tsugami
  • Citizen
  • Sodick
  • Mazak
  • Miyano
  • Muratec
  • Kennametal
Interstate-McBee Green Machining

Heat Treatment

After steel is turned into blanks there are many potential companies that offer varying degrees of expertise in heat treatment.  Interstate-McBee seeks out key strategic partners to offer our customers industry leading heat treatment technologies, which include:

  • Vacuum carbo nitride
  • Plasma ion nitride
  • Core hardening
  • Thermal deburr
  • Through hardening
Interstate-McBee Heat Treat


After heat treatment, a variety of techniques can be applied to give our parts the desired finish.  We use:

  • Precision ID (Inside Diameter)
  • Precision OD (Outside Diameter)
    • Cylindrical grinding
    • Centerless grinding
  • Surface grinding
  • Super finishing (“super abrasives”)
  • Lapping
  • EDM (Electrical Discharge Machining)
  • Honing
Interstate-McBee Tear Down


Interstate-McBee Core Assembly

1. Every core assembly to be remanufactured goes through a full tear-down

Interstate-McBee Parts

2. Each part is sorted separately

Interstate-McBee Restorations and Examinations

3.  Individual parts must go through a strict sequence of restorations and examinations in order to be considered qualified

Interstate-McBee Non-qualified Parts

4.  Non-qualified parts are discarded

Interstate-McBee New Cores

5. Injectors are assembled using only qualified parts

Assembly and Testing

The final step in our process guarantees that the product our customers receive is always consistent with our industry-leading standards.  Every injector, whether new or remanufactured, is tested 100% for key performance characteristics such as:

  • Pressure
  • Leakage
  • Fuel output
  • Electrical timing
Interstate-McBee Assembly and Testing
Interstate-McBee Assembly and Testing
Interstate-McBee Assembly and Testing


  • We produce over 2500 unique gaskets at our Facilities in Cleveland, OH
  • 30+ different base materials are used to achieve superior performance without compromising functionality and seal ability
  • Our products are made in the USA and use 100% Asbestos-Free Material
  • Our gasket manufacturing facility is ISO 9001:2015 with Design certified.
  • We manufacture over 1.5 million total gaskets annually.