Product Details

Product Overview

Upgrade your Caterpillar heavy-duty diesel engine with our premium quality piston assembly, featuring the genuine OEM cross-reference part number 7N3633. This piston with pin is specifically engineered to meet the rigorous demands of Caterpillar’s 3406, 3408, and 3412 engine platforms. As a trusted supplier in the global B2B aftermarket, we provide direct shipping from our strategic warehouses to major industrial hubs across North America, Europe, the Middle East, and Asia-Pacific. Our inventory is designed for fleet managers, equipment dealers, and maintenance professionals seeking reliable, cost-effective replacement solutions.

Key Features & Benefits

• Precision Engineering: Manufactured to match OEM specifications, ensuring a perfect fit and optimal compression ratio for maximum engine efficiency.
• Superior Durability: Constructed from high-strength aluminum alloy with a reinforced steel insert, designed to withstand extreme combustion pressure and thermal stress.
• Reduced Friction: The included piston pin features a precision-ground surface for smooth articulation, minimizing wear on the connecting rod bushing.
• Enhanced Oil Control: Advanced ring groove design works with your piston ring set to reduce oil consumption and blow-by, extending engine life.
• Direct Replacement: Drop-in ready component; no modifications required for standard rebuild applications on 3406, 3408, and 3412 engines.

Technical Specifications

OEM Cross-Reference

This piston assembly is a direct replacement for the following Caterpillar original equipment numbers:

• Primary OEM: 7N3633
• Alternate Numbers: 7N3634, 7N3635 (Variants for specific engine configurations)
• Service Part: 1W5106 (Piston Ring Set sold separately)

Compatibility

• Engine Models:
  • Caterpillar 3406 (PC, DIT, B, C models)
  • Caterpillar 3408 (Naturally Aspirated and Turbocharged)
  • Caterpillar 3412 (V12 configurations)
• Vehicle/Equipment Applications:
  • On-Highway Trucks (Peterbilt, Kenworth, Freightliner)
  • Industrial & Marine Engines
  • Generator Sets (G3406, G3408, G3412)
  • Construction Equipment (D8 Dozers, 988 Loaders, 773 Trucks)

Global Supply & Distribution

We maintain robust stock levels to support rapid global fulfillment. Our logistics network ensures reliable delivery to:

• North America: Major ports (Los Angeles, Houston, New York) and inland industrial zones (Chicago, Dallas, Atlanta).
• Europe: Rotterdam, Hamburg, and Antwerp hubs for distribution across the EU and UK.
• Middle East & Africa: Dubai, Jeddah, and Durban for oil & gas and mining sectors.
• Asia-Pacific: Singapore, Shanghai, and Sydney for regional mining and construction fleets.

We offer flexible shipping terms (FOB, CIF, EXW) and can consolidate orders for large-scale fleet maintenance projects. All exports are fully documented for customs clearance.

Quality Assurance

• Manufacturing Standard: ISO 9001:2015 certified production facility.
• Inspection: 100% dimensional inspection using CMM (Coordinate Measuring Machine) and ultrasonic wall thickness testing.
• Warranty: 12-month warranty against manufacturing defects under normal operating conditions.
• Certification: Material test reports (MTR) available upon request for quality verification.

FAQ

Q1: Is this piston compatible with a 3406B engine, or does it require the later 3406C model?
A1: This 7N3633 piston is designed for both the 3406B and early 3406C models. However, if your engine is a late-model 3406E (electronic), you require a different piston design. Please verify your engine serial number prefix (e.g., 1LW, 2WS) to ensure correct fitment. For mechanical 3406 engines, this is the standard replacement.

Q2: Do I need to replace the piston pin bushing in the connecting rod when installing this piston?
A2: It is highly recommended. While the pin is new and precision-ground, the connecting rod bushing can wear over time, leading to clearance issues. We advise replacing the bushing and reaming it to the correct tolerance (typically 0.0015 – 0.0035 inch clearance) to ensure optimal pin lubrication and prevent premature failure.

Q3: What is the recommended break-in procedure after installing these pistons?
A3: After a complete rebuild, avoid high-load operation for the first 50 hours. Run the engine at varying RPMs (not constant idle) under light load. Use a high-quality break-in oil (API CI-4 or higher) and change the oil and filter after the initial 50 hours to remove any wear particles from the seating process. Monitor coolant and oil temperatures closely during this period.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .