Arthur Bonachella
Instructor at ROBIEL, the tooling manufacturer whose kits are used in every course. Teaches Bosch Piezo, Denso G4S, ISX15, Bosch CRIN 4.2, CAT C15 Series and CAT C7/C9.
/ Bosch CRIN 4.2 (Detroit DD15) online course
The CRIN 4.2 is the Detroit DD15 injector: two coils, two valves and a pressure amplifier inside its own body, plus a micro filter that has to be thread-cut and pulled out. This course covers the filter, both coils, the amplifier valve stroke and the tool that keeps two unreplaceable pins from snapping.
/ The real problem
Two solenoid pins snap the moment the nut turns without the right tool. They are part of the body. When they go, the whole injector goes with them, before the rebuild has even started.
The solenoid nut cannot be turned without locking the solenoid first. If it spins, the two electrical pins shear, and they aren't sold on their own. The tool that prevents it is shown in Lesson 01.
It sits inside the injector body. Threads are cut into it and it is pulled out with the extraction tool. Blocked, no fuel enters and the injector doesn't fire, with everything else perfect.
Coil A runs 1.3 to 1.9 Ω and 500 to 550 mH. Coil B runs 0.5 to 0.9 Ω and 300 to 370 mH. Judge both against one range and you'll condemn a healthy coil or pass a dead one.
/ The numbers
The CRIN 4.2 is measured differently from a single-coil injector. These are the numbers the lessons work with, read on camera.
Factory value is 0.50 mm with a 0.02 mm tolerance. Measured with the valve mounted in its tool, torqued to 20 Nm. Corrected with the shim under the solenoid.
The first solenoid. Reads 1.42 Ω and 527 mH in the lesson, both in range on the diagnostic station.
The second solenoid, with its own range. Reads 0.68 Ω and 336 mH. Insulation on both must stay above 100 MΩ.
/ What's inside
70 minutes filmed at the bench, including the micro filter that, in the instructor's words, some people don't know is there.
The disassembly where this injector is most likely to be destroyed.
Sealing surfaces first, then everything back in order.
Measuring the valve stroke that sets internal pressure.
Two coils, three tests, one diagnostic station.
/ Who's teaching
He doesn't teach from slides. Every lesson is filmed at a working bench with ROBIEL tooling, and the camera stays on the part. When a reading comes out of range, the correction is shown on camera.
Instructor at ROBIEL, the tooling manufacturer whose kits are used in every course. Teaches Bosch Piezo, Denso G4S, ISX15, Bosch CRIN 4.2, CAT C15 Series and CAT C7/C9.
He doesn't teach from slides. Every lesson is filmed at a working bench, and the camera stays on the part. When a reading comes out of range, the correction is shown on camera.
/ The offer
One-time payment / Lifetime access
Enroll in the CRIN 4.2 course ↗Secure checkout by Hotmart
Start the lessons right away. If it doesn't change how you rebuild a CRIN 4.2, request a refund within 7 days of purchase and you get your money back.
/ Before you enroll
Course access, tools, experience and the practical details. The things to know before you enroll.
A vise plus the solenoid-locking tool for this injector, the nozzle nut and valve wrenches for the CRIN 4.2, a torque wrench covering 20 to 100 Nm, the filter thread-cutting and extraction tools, diamond grinding tools with cutting oil, and a diagnostic station that reads both coils. Every tool is shown and named on screen as it's used.
A micro filter inside the injector body. Threads are cut into it and it is pulled out with an extraction tool. If it blocks, no fuel enters the injector and it will not fire, even with everything else in perfect condition. Lesson 01 shows the whole extraction.
Because it carries a pressure amplifier inside its own body: two solenoids and two valves, one of them for the amplifier. Each coil has its own resistance and inductance range.
No. The adjustments in the course are mechanical: shims, strokes and torques read on a dial gauge. Electrical reference values can vary between testers, so check a known-good injector on your own equipment.
Both. Every part is explained as it comes out, so you can start without prior injector experience. The tolerances and calibration methods are what experienced techs come for.
English, with captions.
The course carries a 7-day guarantee. Request a refund within 7 days of purchase and you get your money back.
/ Ready to get started?
Learn the sequence that keeps the core alive and the numbers that prove the rebuild.
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