FORD MOTOR COMPANY 8C3Z-6700-B Diesel Front Crank Seal 8C3Z-6700-A 6.4L V8

( Brand: Ford Motor Company ), ( Manufacturer Part Number: 8C3Z-6700-B ), ( Part Type: Seal Crank Motor ), ( Items Included: Seal ), ( Ipn: 8c3z-6700-a ), ( Manufacturer Warranty: Yes ), ( Placement On Vehicle: Front )

Review FORD MOTOR COMPANY New Oem Super Duty 6.4l V8 Diesel Front Crank Seal fits 2008–2010

The **Ford Motor 8C3Z-6700-A (2008 2010) 6.4L V8 Diesel Front Crankshaft Seal** is a precision-engineered, high-performance sealing component designed exclusively for Ford s robust **Power Stroke 6.4L V8 diesel engines**, found in iconic models like the F-250, F-350, Excursion, and Super Duty trucks from the 2008 through 2010 model years. Crafted from **high-quality nitrile rubber with a reinforced steel backing**, this seal is engineered to withstand the extreme pressures, temperatures, and mechanical stresses inherent in heavy-duty diesel applications, ensuring long-lasting reliability and leak-free operation. The **8C3Z-6700-A** features a **precision-molded lip design** optimized for smooth sealing against the crankshaft journal, minimizing friction while maintaining a tight, consistent barrier against oil and coolant intrusion critical for preventing costly internal engine damage. Compatible with both the **AOD (Automatic Overdrive) and 6R140 (6-speed automatic) transmissions**, this seal is a direct-fit replacement for the original equipment part, eliminating the need for modifications or adapters. Its **durable construction** resists oil degradation, heat distortion, and premature wear, making it an ideal choice for fleet operators, towing enthusiasts, and off-road adventurers who demand peak performance from their Power Stroke engines. Whether installed during routine maintenance or as part of a preventive overhaul, this seal helps extend the lifespan of the front crankshaft area, reducing the risk of oil leaks that can lead to catastrophic engine failure. Backed by Ford s engineering standards, the **8C3Z-6700-A** is a trusted solution for maintaining the integrity of one of the most powerful and durable diesel platforms in the industry.

### **Pros and Cons of Buying a Ford 8C3Z-6700-A (2008 2010) 6.4L V8 Diesel with a Worn Front Crankshaft Seal (Part #8C3Z-6700-B)**

1. **Proven Durability** The 6.4L Power Stroke diesel engine is known for its robustness, especially when properly maintained. Many units last well beyond 300,000 miles with regular upkeep.

2. **Strong Resale Value** Ford s diesel trucks hold their value better than many competitors, making them a solid long-term investment if kept in good condition.

3. **High Torque Output** The 6.4L produces **440 lb-ft of torque**, which is excellent for towing, hauling, and off-road use, especially in older models that have been modified or upgraded.

4. **Aftermarket Support** This engine benefits from a large aftermarket community, offering upgrades (turbochargers, injectors, fuel pumps) and diagnostic tools to extend its life.

5. **Potential for Cost-Effective Repairs** If the front crank seal is the only major issue, replacing it (around **$300 $600 installed**) is relatively affordable compared to a full engine rebuild or replacement.

6. **Fuel Efficiency** Compared to modern gasoline engines, the 6.4L diesel remains efficient, especially in stop-and-go driving, though it lags behind newer turbo-diesels in highway efficiency.

7. **Availability of Parts** Since these trucks are still in production (or nearly so), finding OEM and aftermarket parts remains easier than for discontinued models.

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1. **Front Crank Seal Failure Risks Oil Leaks** A failing front crank seal can lead to **oil leaks into the timing cover or oil pan**, requiring frequent top-offs and risking contamination of the timing belt/chain system. If ignored, it can damage the timing components, leading to **expensive engine failure**.

2. **Timing Chain/Guide Wear** The 6.4L uses a timing chain (not belt), but the guides and tensioners can wear out over time, leading to **chain stretch, rattling, or failure**. Replacement is costly (**$1,500 $3,000 **) and labor-intensive.

3. **Injector and Fuel System Issues** Common problems include **failing injectors, clogged fuel filters, and turbocharger wear**, which can reduce power and efficiency. Replacing injectors alone can cost **$1,000 $2,500**.

4. **DPF/EGR Concerns (2008 2010 Models)** Early 6.4L diesels were not DPF-equipped, but **EGR coolers and valves** can fail, leading to **power loss and emissions issues**. Some owners modify these systems to improve reliability.

5. **Transmission Wear** The **6R130/6R70 transmission** in these trucks is strong but can develop **slippage or rough shifting** over time, requiring a rebuild (**$2,500 $4,000**).

6. **High Maintenance Costs Over Time** While repairs are manageable, the cumulative cost of keeping a **10 15-year-old diesel** running can add up, especially if major components (turbo, injectors, transmission) fail.

7. **Emissions and Compliance Risks** Some states have **diesel emissions regulations** that may require **DPF or EGR modifications**, adding complexity and cost if the truck is used in urban areas.

8. **Resale Depreciation** Even well-maintained 6.4L trucks lose value over time, and buyers may expect lower prices due to age and potential reliability concerns.

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- You **budget for the seal replacement** and **address related issues** (oil leaks, timing chain condition).

- You **plan to keep it for the long term** and perform **regular maintenance** (oil changes, fuel system cleaning, turbo inspections).

- You **accept that some wear is inevitable** and are prepared for **potential transmission, injector, or turbo failures** down the road.

However, if you **prioritize low maintenance, modern reliability, or plan to sell soon**, this truck may not be the best choice. The **front crank seal is a red flag**, but if you **fix it now and monitor the timing chain/transmission**, you could still get **years of solid service** from this engine.

---

- **Get a pre-purchase inspection** (PPI) focusing on the **crank seal, timing chain, injectors, and transmission**.

- **Replace the front crank seal immediately** and **check for oil leaks** in the timing cover area.

- **Verify the timing chain tensioners and guides** if they re worn, budget for replacement soon.

- **Test drive and monitor for rough shifting** (transmission health).

- **Look for a truck with lower mileage (

- **Avoid models with DPF/EGR modifications** unless you re prepared for emissions compliance.

- **Consider a newer diesel (7.3L or 6.7L Power Stroke)** if you want **better reliability and fuel efficiency**.

- **Upgrade the turbo** (if stock is failing).

- **Replace injectors proactively** (every 100,000 150,000 miles).

- **Monitor transmission fluid** and **shift smoothly** a rebuild may be needed soon.

This truck can be a **great value for a diesel enthusiast** who enjoys **working on their own vehicle** and doesn t mind **planned maintenance costs**. However, if you want **plug-and-play reliability**, a **newer diesel or gasoline truck** may be a smarter long-term choice. **Fix the crank seal now, but be prepared for other potential issues down the road.**

Details:

Brand new in sealed package.

part #: 8c3z6700 prices

• $48.95-$297.00

specifications cranshafengin:

• for makes: Ford
• for years: 2008-2010
• brand: Ford Motor Company
• mpn: 8c3z-6700-b
• part type: Seal Crank Motor
• items included: Seal
• ipn: 8c3z-6700-a
• manufacturer warranty: Yes
• placement on vehicle: Front

shipping cranshafengin:

• type: Calculated
• carrier: USPS
• service: USPS Ground Advantage
• transit: 6-12 Days
• cost: $0.00
• class: Standard

payments cranshafengin:

• credit card: Discover
• other
• wallet: Paypal

general cranshafengin:

• condition: New
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

returns cranshafengin:

• policy: No Returns

seller cranshafengin:

• # reviews: 1455
• rating: 100.0%
• city: Lynchburg, Missouri

offer cranshafengin:

• options: Ship-to-home
• started: February 11, 2026
• quantity: 1
• availability: In Stock
• sold: 0

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