Cummins QSB 6.7 Parts for Australia - Connecting Rod Section

Connecting Rod Components for Cummins QSB 6.7 Engines

The connecting rod assembly in the Cummins QSB 6.7 plays a critical role in transferring combustion energy from the piston to the crankshaft. This high-strength component is subjected to extreme pressures and temperatures, making proper maintenance and part replacement essential for reliable performance in marine, industrial, and heavy equipment applications.

Diesel Pro Power supplies premium-quality connecting rod parts for the QSB 6.7, including standard and oversized bearing sets, fracture-split and non-fracture rod bearings, connecting rod bushings, and cap bolts. Each part is manufactured to precise Cummins specifications to ensure correct fit, durability, and long service life.

Bearing Sets for Cummins QSB 6.7 Connecting Rods

Connecting rod bearings provide the smooth, low-friction surface that allows the rod to pivot on the crankshaft journal. Over time, bearings can wear due to oil contamination, insufficient lubrication, or normal operating stress.

We carry a full range of bearing set options for QSB 6.7 connecting rods, including:

• Standard Size Bearings for Non-Fractured Rods – Ideal for engines with crank journals still within factory specifications.
  
  

• Oversize Bearings (0.25 mm & 0.50 mm) for Non-Fractured Rods – Used when crankshaft journals have been machined undersize to remove scoring or wear.
  
  

• Standard Size Bearings for Fracture-Split Rods – Designed for later-model QSB 6.7 engines that use fracture-split connecting rods for improved strength and precision.
  
  

• Oversize Bearings (0.25 mm & 0.50 mm) for Fracture-Split Rods – For rebuilt engines requiring thicker bearing shells after crankshaft machining.
  
  

All bearing sets include both the upper and lower shells to service one connecting rod. Using correct size and type is crucial to maintaining optimal oil clearance and preventing rod knock or catastrophic bearing failure.

Connecting Rod Bushings

The connecting rod bushing provides the bearing surface for the piston pin (also called the wrist pin) where the rod connects to the piston. Our QSB 6.7 bushings are machined from high-quality bronze or bi-metal materials to withstand heavy loads and high RPM operation.

Installing new bushings during a rebuild ensures proper pin alignment, reduces the risk of piston slap, and extends engine life. These bushings are suitable for all QSB 6.7 engine applications, including marine propulsion, generators, and industrial power units.

Connecting Rod Cap Bolts

Cap bolts secure the connecting rod cap to the rod body, clamping the bearing around the crankshaft journal. They must withstand extreme tensile forces during every power stroke, making quality and proper torque critical.

We offer both early-style bolts for non-fracture rods and bolts for fracture-split rods, ensuring compatibility with your specific QSB 6.7 build. Replacing connecting rod bolts during engine overhauls is strongly recommended, as reused bolts can lose clamping strength over time.

Importance of Correct Sizing and Installation

The QSB 6.7 connecting rod system is designed with extremely tight tolerances. Using the wrong bearing size, failing to replace worn bushings, or reusing fatigued bolts can lead to oil pressure loss, rod knock, or even complete engine failure. When performing a rebuild or repair:

1. Inspect the crankshaft journals for scoring, taper, or out-of-round conditions.
   
   

2. Measure oil clearance precisely with plastigage or micrometers before final assembly.
   
   

3. Replace bearings and bushings as a matched set for consistent wear and lubrication.
   
   

4. Torque bolts to factory specifications using a calibrated torque wrench, and use new bolts when required.
   
   

Diesel Pro Power – Your Source for Cummins QSB 6.7 Connecting Rod Parts

With over 40,000 satisfied customers worldwide, Diesel Pro Power is the trusted supplier for genuine-fit connecting rod components for Cummins QSB 6.7 engines. We maintain ready-to-ship inventory, so you can get the parts you need without costly downtime.

Whether you are rebuilding a marine propulsion engine, servicing an industrial power generator, or overhauling a construction equipment powerplant, our connecting rod parts are built to match Cummins quality and performance standards.