OE / Part Number
5253887
Also Interchange: 3972540 3941140 393589 3966658
Kit Includes / Quantity
6 Pieces
6x Rocker Lever Assembly (Shaft Support)
Product Type / Condition
Rocker Arm Shaft Support
Brand New · Aftermarket (OEM‑grade)
Engine Fitment Cummins 8.3L & 8.9L 6‑Cylinder
8.3C ISC ISC CM2150 ISC CM2250 ISC 8.3 CM850 QSC8.3 CM554 QSL9 CM2250 ISL9 ISL CM2150 ISL CM2250 ISL9 CM2350 GTA8.3
Compatibility: Designed for 6-cylinder Cummins engines. Always verify your original part number (5253887 or 3972540) and engine serial number (ESN) before ordering.
Condition: New
️ Material: High‑strength cast iron / alloy steel
Function: Precision valve actuation for intake/exhaust rockers
️ Quality: Factory tested · High durability · Long service life
Installation: Direct replacement · Requires proper torque specs
Package: 6x rocker assemblies (as shown)
Before Ordering — Important
• Compare the screw hole position and mounting dimensions with your original parts.
• This is a 6‑piece set (complete for a 6‑cylinder engine). Verify the quantity needed for your specific rebuild.
• Professional installation strongly recommended; proper torque and valve lash adjustment required.
• Compare the screw hole position and mounting dimensions with your original parts.
• This is a 6‑piece set (complete for a 6‑cylinder engine). Verify the quantity needed for your specific rebuild.
• Professional installation strongly recommended; proper torque and valve lash adjustment required.
Package Includes (exactly as shown in photos):
6x Rocker Lever / Rocker Shaft Support Assemblies (with pre‑installed components)
6x Rocker Lever / Rocker Shaft Support Assemblies (with pre‑installed components)
If you experience any issues, please contact us — we will resolve problems quickly.
Please avoid opening a return case directly, as we can typically resolve issues faster through communication.
Please avoid opening a return case directly, as we can typically resolve issues faster through communication.