Product Specifications
| Parameter | Details |
|---|
| Part Name | Overhaul Rebuild Kit for Cummins Engine B3.3 / QSB3.3 |
| Part Number (OEM Reference) | 4944477 |
| Brand Compatibility | Cummins |
| Engine Model Fitment | B3.3, QSB3.3 |
| Content | 1 Set Overhaul Gasket Kit, 1 Set Cylinder Liners (Semi-finished), 1 Set Standard Pistons, 1 Set Piston Pins, 1 Set Snap Rings, 1 Set Rod Bushings, 1 Set Standard Piston Rings, 1 Set Main Bearings, 1 Set Connecting Rod Bearings, 1 Set Thrust Washer, 1 Set Intake/Exhaust Valves, 1 Set Valve Guides, 1 Set Intake/Exhaust Valve Seats |
| Condition | New Aftermarket |
| Warranty | 6-month standard warranty against manufacturing defects |
| Packaging | Industrial-grade corrugated box with anti-static foam inserts and moisture-resistant lining |
Compatible Models
| Brand | Applicable Models |
|---|
| Cummins | B3.3, QSB3.3 |
Tired of Engine Downtime During B3.3 Overhauls? Get the Genuine Gasket & Liner Rebuild Kit for Your Cummins QSB3.3
Every hour a construction excavator or generator set sits idle due to engine failure costs operators $850–$2,200 in lost productivity — especially when waiting weeks for OEM parts or discovering counterfeit gaskets failed after 200 operating hours. Misidentified liners or mismatched piston rings cause cylinder scoring, compression loss, and repeat teardowns. You need precision-engineered components that fit, seal, and last — not guesswork.
OEM-Equivalent Quality, Ready to Ship from Guangzhou Warehouse
This Cummins B3.3 rebuild kit is manufactured in ISO 9001-certified facilities and undergoes full functional validation before shipment — including liner roundness measurement (±0.005 mm tolerance), gasket compression testing (12 MPa burst pressure), and bearing clearance verification per SAE J352 standards. With 10 years’ experience supplying rebuild kits to repair centers across North America, Africa, and Southeast Asia, XUNPO ensures every component meets the torque, thermal, and wear requirements of real-world B3.3 applications — from hydraulic excavator powertrains to marine auxiliary engines.
Where This Part Works
This rebuild kit supports high-duty-cycle operations in mining haul trucks, port container handlers, municipal backhoe loaders, and remote-site diesel generators. In these environments, the B3.3 engine operates at 75–90% load for 12+ hours daily, subjecting cylinder liners to abrasive dust ingress and thermal cycling between 80°C and 220°C. Correct liner metallurgy and gasket sealing integrity directly determine oil consumption rate, blow-by control, and service interval extension — making precise part selection non-negotiable for fleet uptime.
Engineering Details That Matter
The cylinder liners are centrifugally cast grey iron (ASTM A48 Class 30) with nitrided inner bores (HV950 surface hardness) to resist scuffing under boundary lubrication. Gasket sets use multi-layer steel (MLS) construction with Viton® elastomer coating for consistent sealing across 50–250°C temperature swings. Piston rings feature chrome-plated top rings and molybdenum-coated second rings to maintain ring tension and reduce wear during cold starts. All bearings meet SAE 40 specification with controlled crush allowance (0.025–0.035 mm) to ensure proper journal contact under dynamic loads.
The Real Cost of Wrong Parts
A $120 counterfeit gasket kit may save $45 upfront — but leads to head gasket failure within 300 hours, requiring $2,800 in labor, $1,100 in additional parts, and 5 days of equipment downtime. Incorrect liner bore finish causes piston slap and accelerated crankshaft wear, shortening total engine life by 35%. This Cummins B3.3 genuine gasket and liner overhaul kit eliminates those risks: it complies with ISO 8536-3 for sealing performance and ASME B16.20 for flange gasket dimensional accuracy — reducing total cost of ownership (TCO) by up to 42% over three service cycles compared to low-tier alternatives.
Why Customers Trust XUNPO
We partner exclusively with ISO 9001-certified factories and perform incoming material inspection on 100% of liner batches using coordinate measuring machines (CMM). Every rebuild kit undergoes pre-shipment performance testing: liner roundness verified via air gauge, gasket leak test at 15 bar, and bearing clearance confirmed with plastigage. We offer 6-month warranty covering all manufacturing defects, backed by 10 years of export experience serving 120+ countries. Our 20+ technical specialists verify part compatibility within 2 hours using OEM service manuals and cross-reference databases. Over 10,000 SKUs are held in stock at our Guangzhou warehouse — enabling same-day dispatch for urgent B3.3 rebuild needs.
Packaging & Shipping
- Each kit packed in a reinforced corrugated box with custom-cut EPE foam cradles to prevent liner distortion and gasket compression during transit
- In-stock items ship within 2–5 working days after order confirmation
- Flexible logistics: Express (DHL/FedEx/UPS), air freight, or sea freight — all with real-time tracking
- Full shipment visibility from Guangzhou warehouse to your dock, including customs documentation support
- MOQ is 1 piece — no minimum order threshold for urgent field repairs or diagnostic testing
Get Your Cummins B3.3 Rebuild Kit Now
Your machine isn’t generating revenue while it waits. Send us your part number (4944477), engine model (B3.3 or QSB3.3), and required quantity — we’ll deliver a competitive quote within 24 hours. First-time buyers can request a sample kit for bench testing before bulk ordering. With Guangzhou inventory and global logistics, you get OEM-equivalent reliability without OEM delays.
Frequently Asked Questions
Q: Is this an original Cummins part or an aftermarket replacement?
A: This is an OEM-equivalent aftermarket rebuild kit, produced in ISO 9001-certified factories to match Cummins B3.3 engineering specifications — not a counterfeit or gray-market item.
Q: How do I confirm this kit fits my specific engine?
A: Provide your engine serial number or machine model — our technical team verifies compatibility using Cummins service bulletins and cross-reference data, responding within 2 hours.
Q: What is the warranty coverage?
A: 6-month warranty against manufacturing defects; defective components replaced free of charge upon return verification.
Q: What is the minimum order quantity?
A: 1 piece — ideal for emergency repairs, pilot testing, or small workshops with limited storage space.
Q: How fast can I receive the kit after placing an order?
A: In-stock kits ship within 2–5 working days. Express delivery options available for urgent needs.
Q: Can I request a sample before placing a bulk order?
A: Yes — first-time customers may request a sample kit for functional validation prior to full procurement.
Ready to order or need a quote?
Send your part number, machine model, and quantity — we'll respond within 24 hours.
WhatsApp: +86 187 2205 7128 | Email: talos@xunpojx.com
