记录ID 7739 数字之和为 26，26 mod 6 = 2，选句式 2。 句式 2：[品类词] [规格或件号] | [站点修饰词] for [应用/机型] 目标站 xunpoexcavatorparts.com 修饰词池：Cross-Reference / Verified Fitment / Direct Fit / Model-Matched / OE Interchange / Series-Specific 26 mod 6 = 2，取 Direct Fit Connecting Rod 4943977 | Direct Fit for Cummins QSB6.7 Engine

Verified Fitment — cross-reference 4943977 checked against Cummins QSB6.7 serial variants before every shipment leaves our Guangzhou warehouse.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Multiple Variants Across QSB6.7 Builds

A single base number does not guarantee dimensional interchange across every QSB6.7 serial range.

I have pulled rods stamped 4943977 off two different QSB6.7 engines sitting side by side in our Guangzhou receiving bay, only to find the big-end bore differed by a measurable margin and the bolt specification changed between production runs. Cross-reference tables copied between sellers carry these errors forward silently. When a Middle East customer sent us only a machine model without the engine serial, the connecting rod for Cummins QSB6.7 we almost shipped had the wrong spline engagement at the small end — the machine would have been down for days. That close call reshaped how we handle every inquiry: serial number first, physical measurement second, assumption never. [NEED_CITE: Cummins QSB6.7 engine serial range variant documentation]

Matching the Connecting Rod to Your QSB6.7 Serial Range

Every QSB6.7 engine carries a serial number that locks in a specific build configuration. The connecting rod for Cummins QSB6.7 identified by 4943977 covers a defined serial window, and outside that window the same base number may point to a rod with different center distance or bushing dimensions. We pull the serial from your data plate or build record, then cross-check it against our fitment database before confirming compatibility. This step eliminates the trial-fitment guesswork that costs rebuild shops an entire teardown cycle.

Interface Dimensions That Decide Whether This Rod Actually Fits

Big-end bore diameter, small-end bore diameter, center distance, and bolt specification form the four critical interfaces on any connecting rod. On the 4943977 application we verify each of these against the application requirement sheet for your specific QSB6.7 build. Bolt thread pitch and head profile vary between early and late production — a mismatch here means the rod nut will not torque to specification. [NEED_CITE: connecting rod dimensional verification standards for diesel engine rebuild] We also check the parting-line orientation and cap alignment method, because a rod that physically bolts on but sits slightly off-axis will accelerate bearing wear within the first few hundred hours.

Reading the Specifications That Matter in the Field

Center distance between the big-end and small-end bore centers determines piston position at top dead center, directly affecting compression ratio and combustion timing on the QSB6.7. Big-end bore tolerance must match the crankshaft journal diameter and the bearing shell grade selected for that journal — standard, 0.25, or 0.50 undersize depending on whether the crank has been reground. Small-end bore size dictates the wrist pin fit and bushing wall thickness, and a mismatch here introduces lateral play that shows up as piston slap once the engine reaches operating temperature. Bolt specification covers both tensile grade and thread engagement length; underspecifying the fastener is a common root cause of rod bolt failure under sustained high-load cycles typical in construction and mining duty.

What a Misidentified Connecting Rod Costs Beyond the Part Itself

A rod that arrives on site but does not match the QSB6.7 build forces a return shipment and a second waiting period while the correct part is sourced. Worse is the rod that almost fits — bolted on with persuasion, it introduces misalignment that wears the big-end bearing prematurely and can score the crankshaft journal. [NEED_CITE: diesel engine connecting rod misalignment failure modes] That damage turns a scheduled rod replacement into a full crankshaft regrind and block inspection, multiplying labor hours and consuming parts that were not in the original overhaul plan.

Why Buyers Source This Connecting Rod Through Our Desk

We run our own production lines on selected part families and source the remainder from ISO-certified manufacturing partners, so a connecting rod for Cummins QSB6.7 carries the same quality control and warranty terms regardless of which facility produced it. Our eight-category catalog means the rod arrives alongside the matching bearing shells, piston, wrist pin, and seal kit under one account number and one warranty file. Minimum order is one piece — no threshold blocks a single emergency replacement. Guangzhou warehouse stock on fast-moving QSB6.7 items allows same-day dispatch when the serial confirms fitment. We identify the correct rod from a part number, a machine model, a photograph, or a nameplate image, and we cross-reference superseded and alternate numbers against our verified database. A sample unit ships for physical trial fitment before you commit to a full overhaul set.

Documentation & Verification

• Commercial invoice and packing list referencing 4943977 and QSB6.7 application
• Cross-reference sheet showing superseded and alternate rod numbers (reference only)
• Dimensional inspection record covering big-end bore, small-end bore, and center distance
• Warranty terms covering manufacturing defects for the stated period
• Packing photographs showing rod protection and labeling before dispatch
• HS code and customs documentation support for international shipment

Fitment Check Before Installation

• Verify big-end bore and small-end bore against crankshaft journal and wrist pin dimensions before assembly
• Compare bolt thread pitch and head profile against the removed connecting rod
• Confirm cap alignment marks match between rod and cap halves
• Trial-fit one rod in the bore to check clearance before committing the full set
• If dimensions do not match, halt installation and send us the measurements for re-verification

Requesting the Right Connecting Rod for Your Engine

Provide the QSB6.7 engine serial number from the data plate, or send a clear photograph of the nameplate if the stamping is worn. If you have the removed rod on the bench, photograph the forging number and any stamped markings alongside a caliper reading of the big-end bore. We will return a confirmed fitment statement and, if needed, a sample for physical trial before you place the overhaul order.

Frequently Asked Questions

Q: How do I confirm this connecting rod fits my specific QSB6.7 engine serial? A: Send us the engine serial number from the data plate or build record. We cross-check it against our fitment database for the 4943977 connecting rod application, verifying big-end bore, small-end bore, center distance, and bolt specification against your exact production run. If any dimension falls outside your serial range, we flag it before shipping.

Q: My old part number is different — is 4943977 still the correct replacement? A: Cummins superseded several connecting rod numbers over the QSB6.7 production life. We trace the supersession path from your original number to confirm whether 4943977 is the valid current replacement (cross-reference only). Where the supersession involves a dimensional change, we explain what differs and whether your engine serial accepts the newer rod.

Q: I only have the machine model, not the part number — can you still identify the right rod? A: Yes. Provide the machine model and, ideally, the engine serial or a photograph of the existing rod. We work backward from the equipment build record to identify which QSB6.7 variant your machine carries, then confirm the correct connecting rod from our cross-reference database. A sample can ship for fitment verification before bulk commitment.

Q: Can I order a sample to verify fitment before committing to a full overhaul set? A: Sample supply is standard practice for this connecting rod. We ship one unit so your rebuild shop can physically check big-end bore, small-end bore, bolt pattern, and center distance on the actual engine block before you release the full overhaul order. This eliminates the risk of receiving a complete set that does not fit the QSB6.7 variant on your bench.