3060270 | Genuine Cummins® Rocker Lever

1. Compatible Cummins® Engine Platforms

• Cummins® K19 / KT19 / KTA19: Heavy-duty 19-liter high-horsepower industrial, generator, and marine diesel engines.

• Cummins® K38 / KTA38: 38-liter V12 high-horsepower engines.

• Cummins® K50 / KTA50: 50-liter V16 high-horsepower engines.

• Cummins® N14 / NTA855 Series: Selected heavy-duty 14-liter commercial truck and industrial engine configurations.

2. Vehicle & Equipment Applications

• Heavy Off-Highway & Mining Equipment: Mining haul trucks, excavators, dozers, and wheel loaders from Komatsu®, Terex®, Caterpillar®, and Hitachi® powered by Cummins® K-Series engines.

• Power Generation (G-Drive / Gensets): Industrial standby and continuous diesel power generators (Cummins Power Generation, Onan) equipped with K19, K38, or K50 engines.

• Marine Power & Auxiliary Units: Commercial marine propulsion engines and auxiliary power units.

• Class 8 Heavy Trucks: Selected heavy-duty commercial vehicles equipped with legacy N14 or K19 power units.

1. What is it?

Part is a precision-machined heavy-duty rocker arm (or part of the rocker lever housing assembly) situated in the cylinder head valvetrain mechanism. It acts as a pivotal lever that converts the rotational/upward motion from the engine camshaft and pushrods into downward actuation, opening and closing the intake/exhaust valves or cycling the unit fuel injectors.

2. Core Functions & Technical Features

• Mechanical Force Transfer: Translates pushrod movement to open cylinder valves or activate mechanical fuel injectors with precise timing.

• Integrated Lubrication Channels: Features internal drilled oil passages to deliver pressurized engine oil to the rocker shaft bushings, adjusting screws, and crosshead contact points to minimize friction and wear.

• Forged Steel Construction: Manufactured from high-tensile forged steel to withstand extreme operational combustion pressures, high valvetrain stresses, and continuous cyclic thermal loading.

1. Excessive Tappet/Valvetrain Noise (Loud Clacking or Tapping)

• Symptom: A distinct, rhythmic metallic clacking or tapping noise coming from under the valve cover that increases with engine RPM.

• Cause: Wear on the rocker lever contact pad, worn adjusting screws, or clearance slack caused by degraded internal bushings.

2. Engine Misfire, Loss of Power, or Rough Idle

• Symptom: The engine stutters, lacks power under load, or runs unevenly on one or more cylinders.

• Cause: Improper valve lift/duration caused by a cracked rocker lever, or incorrect fuel injection timing if the affected rocker actuates a unit injector.

3. Low Oil Pressure or Metal Shavings in Oil

• Symptom: Unexplained drop in oil pressure or metallic debris (bronze/steel fragments) found in the oil filter or oil pan during maintenance.

• Cause: Disintegration of internal rocker lever shaft bushings or galling between the rocker lever pivot and shaft due to lubrication failure.

4. Valve Cover Smoke or Excessive Blow-By

• Symptom: Increased crankcase pressure or excessive oil misting around the breather and cylinder head area.

• Cause: Incomplete combustion caused by sticking or partially opened intake/exhaust valves due to a binding or bent rocker lever.