Valve pushrod 3046420 and injector pushrod 3046430 for the Cummins NT855 diesel engine, supplied as aftermarket replacement parts. Both part numbers are cross-referenced against the original components, so you can match them directly to the rods you are replacing.

Part numbers: 3046420 (valve pushrod) · 3046430 (injector pushrod)
Fits: Cummins NT855 / NTA855 / NTC855 diesel engine
Position: camshaft lifter to rocker lever

What you are ordering

Price is per pushrod, and the two part numbers are separate items — choose the part number you need from the variant menu. The NT855 runs a four-valve cylinder head with one injector per cylinder, so a complete engine takes 24 valve pushrods (four per cylinder) and 6 injector pushrods. The two rods are not interchangeable: fitting an injector rod in a valve position, or the reverse, changes valve lash and injector timing.

Specifications

• Material: induction-hardened carbon steel, ball ends hardened and ground
• Construction: hollow section, internal oil passage feeds the rocker assembly
• Length and ball end radius: to original specification
• Finish: anti-corrosion coating on the shank, oil passage checked before packing
• Packing: individually sleeved, part number labelled on the bag

When to replace

Pushrods bend rather than wear out, usually after a valve sticks, a lifter fails or the engine is over-revved. Typical signs are one cylinder misfiring, a tapping or clicking under the rocker cover, valve lash that will not hold its setting, low power and white or grey exhaust smoke. A suspect rod can be checked by rolling it across a flat surface — any rock means it is out of true. Replace the rod and find the cause before running the engine again, or the new rod will bend the same way.

Fitting notes

Keep each rod in the position it came from, set valve lash and injector timing to the figures in the NT855 service manual for your engine build, then turn the engine over by hand through two revolutions before starting. If you are unsure which rod goes where, send us your engine serial number and CPL and we will confirm the arrangement.

Warranty and shipping

Covered by a 12-month warranty against manufacturing defects. Orders are dispatched within 3–7 business days; DHL / FedEx delivery takes 5–10 business days. Tracking number is sent as soon as the parcel leaves our warehouse.

Note: manufacturer names and part numbers are used for identification and cross-referencing only. We are an independent aftermarket supplier and are not affiliated with, or authorised by, the original manufacturer. Please verify the part number against your engine's parts catalogue before ordering — our team is happy to help if you send us your engine model or serial number.