Valve Lash & Overhead Verified Factory Specs

Heavy Commercial Diesel Injector Preload & Timing Height Matrix

Factory OEM electronic unit injector (EUI / MEUI) height settings, dial indicator timing dimensions, and preload torque specifications for Cummins, Detroit, Caterpillar, and PACCAR diesel engines.

Commercial Diesel Unit Injector (EUI/MEUI) Timing Height Standards

Correct unit injector preload and height setting is essential to prevent injector plunger bottoming, camshaft lobe scuffing, and inaccurate injection timing:

Engine Model	Injector System	Timing Height Spec	Required OEM Tool	Locknut Torque
Caterpillar C15 (6NZ/ACERT)	Cat MEUI-A / MEUI-B	78.0 ± 0.2 mm (3.07 ± 0.01 in)	Cat 9U-7227 Gauge	40 lb-ft (54 N·m)
Caterpillar 3406E	Cat MEUI	78.0 ± 0.2 mm (3.07 in)	Cat 9U-7227 Gauge	40 lb-ft (54 N·m)
Cummins ISX / Signature 600	Dual Cam Injector Rocker	Bottom out + back off 2 flats (120°)	Torque Wrench / In-lb Gauge	70 in-lb bottom out
Detroit Series 60 (DDEC IV/V)	Overhead Cam EUI	78.2 mm / 81.0 mm (Model dependent)	Kent-Moore J-35637	37 lb-ft (50 N·m)
Detroit DD15 / DD13 / DD16	Amplified Common Rail (ACRS)	No rocker height adjustment (Hydraulic Common Rail)	High-Pressure Line Torque Socket	30 N·m + 30° on feed lines

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Technical Reference Citation: Cat SIS RENR2306 / Cummins QuickServe Bulletins

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