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CALIBRATION SHIM KITS FOR COMMON RAIL / HEUI / EUI INJECTORS
Precision Components for Diesel Injector Tuning and Testing
In the world of diesel injection systems, accurate calibration is not optional – it’s essential. Whether you’re working with Common Rail, HEUI, or EUI injectors, proper fuel delivery, pressure regulation, and injector timing all depend on precise mechanical adjustment. That’s where Calibration Shim Kits from REDAT come in.
Designed for professional diesel technicians and injector remanufacturers, REDAT’s calibration shims offer accuracy, reliability, and compatibility with a wide range of injector models. In this article, we’ll explain what calibration shims are, how they work, and why REDAT’s kits are trusted worldwide in diesel workshops.
What are calibration shims and why are they important?
Calibration shims are thin, precision-engineered washers or spacers used in diesel injectors to adjust:
● Spring preload
● Injection timing
● Nozzle lift
● Fuel delivery volume
These adjustments are essential to ensuring that each injector performs consistently within manufacturer specifications. Even a small variation in shim thickness can significantly affect engine performance, emissions, and fuel economy.
Without the correct calibration shim, injectors may exhibit poor spraying, delayed injection timing, or imbalanced fuel distribution, leading to costly wear, rough idling, or outright failure.
Types of injectors that require calibration shim kits
REDAT offers calibration shim kits specifically designed for the following types of diesel injectors.
Common Rail Injectors (CR)
Used in most modern diesel vehicles, these high-pressure injectors require extremely tight tolerances. Shims are used to set valve preload and ensure consistent opening pressures across all cylinders.
HEUI Injectors (Hydraulically Actuated, Electronically Controlled)
Found in many heavy-duty and industrial diesel engines (e.g., Caterpillar, International/Navistar), HEUI systems use engine oil pressure to actuate fuel delivery. Precise shim thicknesses help balance the hydraulic forces and injection events.
EUI Injectors (Electronic Unit Injectors)
Often used in marine and industrial applications, EUI injectors combine mechanical actuation with electronic control. Calibration shims in these systems help set injection timing and lift parameters for optimal efficiency and emissions control.
Why choose REDAT calibration shim kits?
REDAT’s shim kits are engineered to meet the demands of professional diesel technicians. Each kit includes a wide range of shim thicknesses, manufactured to tight tolerances and marked for easy identification.
Key advantages of REDAT shim kits:
➔ A accuracy: every shim is produced with strict tolerances for precise adjustments.
➔ Wide compatibility: kits available for Bosch, Delphi, Denso, Caterpillar, Cummins, Siemens, and more.
➔ Durable materials: manufactured from hardened, corrosion-resistant steel to ensure long-term reliability.
➔ Organized packaging: kits are logically arranged in labeled compartments for fast, error-free selection.
➔ Cost-efficient: buying a full shim kit eliminates the need to source individual sizes and ensures you're always prepared.
Whether you're calibrating a single injector or managing a high-volume remanufacturing operation, REDAT’s calibration shim kits provide the precision and convenience needed to maintain professional standards.
How to use a calibration shim kit in Diesel injector repair
Using a calibration shim kit is a straightforward process — if you have the right tools and follow proper procedures:
- Disassemble the injector
Use REDAT toolkits to carefully remove the injector’s internal components and access the spring seat or nozzle lift assembly. - Measure existing shim or gap
Use a micrometer or feeler gauge to determine the required shim thickness based on the wear or calibration spec. - Select the correct shim
Choose the appropriate shim from the REDAT kit. Every shim is precision-cut and marked for easy identification. - Install and reassemble
Insert the new shim, reassemble the injector using the correct torque values, and prepare it for testing. - Test on a bench
Use a REDAT-supported Hartridge or Bosch test bench to verify injection pressure, fuel delivery, and spray pattern.
Proper calibration using shim kits ensures your Common Rail, HEUI, or EUI injectors perform as designed, every time.
REDAT products support and catalog access
REDAT provides an extensive catalog of shim kits and related tools for diesel injector repair. All kits are listed with reference codes, compatible injector models, and technical specifications.
Explore REDAT’s full range of calibration shim kits
● Available online at www.redat.us
● Access parts list and interactive exploded views
● Check real-time availability and pricing with a registered account
Don’t have access to REDAT’s e-commerce platform? You can submit a quote request or contact our team to open a reserved account for workshop and distributor pricing.
Who uses REDAT calibration shim kits?
REDAT supplies calibration shim kits to: Diesel injector remanufacturers, automotive and industrial repair workshops, authorized diesel engine service centers, technical schools and training centers, and aftermarket distributors.
Our products are used in the servicing of commercial fleets, agricultural machinery, construction equipment, marine engines, and light-duty diesel vehicles.
Ready to calibrate with confidence?
Don’t leave injector performance to chance. With REDAT calibration shim kits, every adjustment is exact, every repair reliable. Equip your workshop with the tools professionals trust — built on over 50 years of diesel expertise.
Contact our U.S. team for more information at +1 (800) 327-2017 – International +1 407-246-1600 or email us at sales@redatnorthamerica.com
Explore WWW.REDAT.US to access parts, check availability, request a quote, or apply for a reserved account.
REDAT - Precision Tools and Spare Parts for the Diesel Industry.
Your partner for Common Rail, HEUI, and EUI injector calibration.