Description
Why Choose This Cummins ISX, QSX Inframe Rebuild Kit From HHP?
- Every component in the kit is new, not used or reconditioned, built to OEM specifications and tolerances
- Manufactured in an ISO 9001 certified facility for quality and consistency throughout the entire kit
- No core charge required on any component in this kit
- Backed by a 2 Year Warranty from HHP, one of the strongest rebuild kit warranties in the aftermarket
- Available in standard and undersized bearing options to match your specific engine condition
- Cross references 4352362, 4376427, 5473066, ISX111-049, ISX111-113, M-3050344, and M-4376427, among others
- Fits Cummins ISX Single Cam, ISX Dual Cam, QSX Single Cam, and QSX Dual Cam engine families
The Problem With OEM Rebuild Kits That Most Shops Do Not Know About
When an ISX or QSX reaches the point where an inframe overhaul is unavoidable, the first instinct for many shops and owner-operators is to go straight to the OEM kit. It seems like the safest call. What most people do not realize is that some OEM inframe rebuild kits include used or reconditioned parts, not new ones. That means your freshly torn-down engine could be going back together with components that have already accumulated heat cycles, wear, and fatigue. That is not a rebuild. That is just buying time.
At HHP, every part inside this Cummins ISX, QSX Inframe Rebuild Kit is new. New cylinder liners, new pistons, new bearings, new gaskets, and new seals. Your ISX or QSX comes back together with a fresh start, not a patchwork of partially worn components that may need attention again sooner than expected. Combined with the 2 Year Warranty and support from HHP’s ASE certified technicians, this kit gives you confidence in the rebuild from the first bolt torqued to the first mile back on the road.
What Is Included in This Cummins ISX, QSX Inframe Rebuild Kit
This inframe kit covers all of the primary wear components needed for a complete ISX or QSX overhaul without pulling the engine from the vehicle. The contents include six Cylinder Liner Kits (4376391), six Piston Kits (2881758), one Upper Engine Gasket Set (4376104), six Connecting Rod Bearings (4089405), one Main Engine Bearing Kit (5406110), one O-Ring Seal (3678756), one Pressure Relief Valve (4357177), one Oil Pan Gasket (4026684), and two product boxes for organized storage and transport during the rebuild process.
Rod bearing size and main bearing size are both required selections at checkout, with options including standard, .010, .020, .025, .030, and .50 to accommodate engines at different stages of wear or that have been previously machined. Selecting the correct bearing sizes is critical to a successful rebuild, and HHP’s ASE certified technicians can help you determine the right specification for your engine before the order ships.
This kit is a substantial package, weighing 216 lbs and shipping in a 46 by 16 by 17 inch container. Because diesel engine parts are engine specific, entering your Engine Serial Number or VIN on the product page before ordering allows HHP’s team to confirm that this kit is the correct fit for your ISX or QSX application, whether single cam or dual cam.
Get Your Cummins ISX, QSX Inframe Rebuild Kit From Highway and Heavy Parts
At $3,976.48 with no core charge, a 2 Year Warranty, and same-day shipping on in-stock orders placed by 2PM EST, this kit delivers outstanding value for one of the most common and most demanding overhauls in the heavy duty diesel industry. Financing is available through PayPal Pay Later and Sezzle for qualified buyers, with PayPal Pay Monthly offering 3, 6, 12, or 24 month payment plans with $0 down, making it easier to move forward with the rebuild without putting the truck down any longer than necessary.
Order your Cummins ISX, QSX Inframe Engine Rebuild Kit (4376427) from HHP today.
Frequently Asked Questions, Cummins ISX QSX Inframe Engine Rebuild Kit (4376427)
1. What engines does inframe rebuild kit 4376427 fit?
This kit is built for Cummins ISX and QSX diesel engines, covering ISX Single Cam, ISX Dual Cam, QSX Single Cam, and QSX Dual Cam engine families. HHP recommends submitting your Engine Serial Number or VIN before ordering so our team can confirm this is the correct kit for your specific engine build.
2. What is included in the 4376427 inframe rebuild kit?
The kit includes six Cylinder Liner Kits (4376391), six Piston Kits (2881758), one Upper Engine Gasket Set (4376104), six Connecting Rod Bearings (4089405), one Main Engine Bearing Kit (5406110), one O-Ring Seal (3678756), one Pressure Relief Valve (4357177), one Oil Pan Gasket (4026684), and two product boxes for organized storage during the rebuild.
3. What is the difference between an inframe rebuild and a full overhaul?
An inframe rebuild allows the technician to replace the major internal wear components, including liners, pistons, rings, and bearings, without removing the engine from the chassis. The block stays in the frame, which reduces labor time and overall cost compared to a full out-of-frame overhaul. This kit is specifically designed and packaged for the inframe procedure on ISX and QSX engines.
4. Are all the parts in this rebuild kit new?
Yes. Every component in this kit is new, built to OEM specifications and tolerances, and manufactured in an ISO 9001 certified facility. HHP does not include used or reconditioned parts in its rebuild kits, unlike some OEM kits that may contain previously used components.
5. What bearing sizes are available for this kit?
Both rod bearing size and main bearing size are required selections at checkout. Available sizes are standard, .010, .020, .025, .030, and .50 to accommodate engines at various stages of wear or previous machining. If you are unsure which size your engine requires, HHP’s ASE certified technicians can help you determine the correct specification before your order is placed.
6. Is there a core charge on this rebuild kit?
No. This ISX, QSX Inframe Rebuild Kit carries zero core charge. There is nothing to return and no additional deposit required at checkout, regardless of which bearing sizes you select.
7. What warranty comes with this rebuild kit?
HHP backs this Cummins ISX, QSX Inframe Engine Rebuild Kit with a 2 Year Warranty, which is one of the strongest rebuild kit warranties available in the heavy duty aftermarket diesel parts industry.
8. What are the signs that my ISX or QSX needs an inframe rebuild?
Common indicators include excessive oil consumption or blowby at the crankcase breather, low or inconsistent compression across cylinders, engine knock from worn bearings, a significant drop in power or fuel economy, coolant contamination from a failed liner seal, and metal particles or shavings in the oil. Any combination of these symptoms suggests the internal wear components are due for replacement.
9. What OEM part numbers does this kit cross reference?
This kit cross references 4352362, 4376427, 5473066, ISX111-049, ISX111-113, ISX111049, ISX111113, M-3050344, M-4376427, M3050344, M4376427, PAIISX111-049, and PAIISX111049. If your current kit or any of its components carry any of these numbers, this HHP kit is a correct replacement.
10. Can I finance this rebuild kit purchase?
Yes. HHP offers financing through PayPal Pay Later and Sezzle at checkout. PayPal Pay Monthly provides 3, 6, 12, or 24 month payment options with $0 down for qualified buyers, making the $3,976.48 investment in your ISX or QSX overhaul much more manageable without delaying the repair any further.
