MOPAR 1064942 Rear Crankshaft Seal Cylinder Nos Kit

( Brand: Mopar ), ( Manufacturer Part Number: 1064942 ), ( Part Type: Seal Crankshaft Cylinder ), ( Manufacturer Warranty: No ), ( Vintage Part: Yes )

Review MOPAR Chrysler Desoto Rear Crankshaft Main Seal Kit Cylinder Nos fits 1942–1948

The **Mopar 1064942 Rear Crankshaft Seal Kit** is a meticulously engineered, high-performance replacement solution designed exclusively for the **1942 1948 Chrysler DeSoto engines** featuring **cylinder nos** specifically tailored for the **331 cubic-inch inline-six (F-2) and 255 cubic-inch inline-six (F-1)** powerplants. This premium seal kit is crafted to restore critical sealing integrity at the rear main bearing housing, preventing costly oil leaks that can compromise engine longevity and performance. Engineered with **high-temperature-resistant elastomers** and **precision-machined components**, this kit ensures a secure, leak-free fit while maintaining optimal crankshaft alignment and reducing friction within the drivetrain. The **OEM-quality gasket and seal assembly** includes a **rear crankshaft seal** (often referred to as the "oil seal"), a **rear main bearing housing gasket**, and sometimes a **rear oil seal retainer** or **thrust washer**, all designed to withstand the demanding conditions of high-revving, high-torque applications characteristic of classic Chrysler engines. Whether restoring a vintage DeSoto for classic car shows, daily driving, or high-performance modifications, this kit eliminates the frustration of persistent oil leaks at the rear main seal where moisture, debris, and thermal expansion can otherwise degrade factory seals over time. Built to Mopar s rigorous standards, it combines **durability, ease of installation**, and **long-term reliability**, making it an indispensable upgrade for enthusiasts seeking to preserve the mechanical integrity of their beloved pre-war Chrysler powerplants.

**Pros and Cons of buying a Mopar 1064942 Rear Crankshaft Seal Kit (1942 1948 Chrysler DeSoto)**

1. **Direct Fitment** This kit is specifically designed for 1942 1948 Chrysler DeSoto engines, ensuring compatibility without modifications. It includes the necessary components to replace the rear main seal, which is critical for preventing oil leaks and maintaining engine integrity.

2. **Quality Materials** Mopar is a trusted brand known for using durable materials in its replacement parts. The seal kit likely includes a high-quality rubber or synthetic seal, along with gaskets and hardware that meet or exceed OEM standards.

3. **Prevents Engine Damage** A failing rear crankshaft seal can lead to oil leaks, which may contaminate the transmission fluid (in rear-wheel-drive applications) or cause excessive oil consumption. Replacing it proactively avoids costly engine or transmission repairs.

4. **Ease of Installation** The kit is designed for straightforward installation, though experience with engine work is recommended. It typically includes clear instructions, and the components are pre-packaged for convenience.

5. **Long-Term Reliability** A properly installed rear crankshaft seal can last for the life of the engine if maintained correctly, reducing the need for frequent replacements.

6. **Support for Classic Cars** For vintage vehicles like the DeSoto, authentic or high-quality aftermarket parts like this kit help preserve the car s value and performance while ensuring reliability.

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1. **Cost** Replacement parts for classic cars, especially from a reputable brand like Mopar, can be more expensive than generic aftermarket alternatives. The price may be a significant investment for a vehicle that may not have high daily usage.

2. **Labor Intensity** Installing a rear crankshaft seal requires removing the transmission, engine components, and sometimes the flywheel or flexplate. This is a labor-intensive job that may require professional help, adding to the overall cost.

3. **Potential for Additional Wear** If the seal failure was due to underlying issues (e.g., worn crankshaft journals, improper installation, or contamination), replacing just the seal may not fully resolve the problem. A thorough inspection of related components may be necessary.

4. **Limited Availability of Tools** Working on older engines may require specialized tools (e.g., pullers, torque wrenches with specific ranges) that are not universally available. Some mechanics may charge extra for accessing these tools.

5. **Risk of Improper Installation** If not installed correctly, the new seal could leak or fail prematurely. This requires careful attention to torque specifications, seal alignment, and proper sealing surface preparation.

6. **Age of the Vehicle** If the DeSoto is in poor condition beyond the crankshaft seal, the repair may not be cost-effective. A full assessment of the engine, transmission, and other systems is advisable before proceeding.

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The Mopar 1064942 rear crankshaft seal kit is a reliable and well-suited option for 1942 1948 Chrysler DeSoto owners facing oil leaks or seal failure. Its direct fitment, quality materials, and long-term reliability make it a strong choice for those prioritizing durability and authenticity. However, the high cost, labor-intensive installation, and potential for hidden issues mean it is not a decision to be taken lightly.

For enthusiasts who value their classic vehicle s performance and longevity, this kit is worth considering especially if the engine is otherwise in good condition. Those on a tight budget or with a vehicle in poor overall health may explore alternative solutions, such as generic seal kits or consulting a mechanic to assess whether the repair is justified.

If you are experiencing rear crankshaft seal leaks or plan to perform routine maintenance on your DeSoto, **proceed with purchasing the Mopar kit** if you have the budget and access to proper tools or mechanical expertise. Pair this purchase with a full inspection of the engine and transmission to address any related wear. If the vehicle s condition is questionable, weigh the cost of the repair against the car s overall value and your long-term goals for it. For those uncomfortable with the installation, hiring a specialist in classic car repairs is advisable to ensure a proper job.

Details:

1942-1948 Chrysler DeSoto Rear Crankshaft Main Seal Kit 6 Cylinder 1064942 NOS. Happy motoring. All we ask is that ship back with original box. Part Number: 1064942.

Make: DeSoto Chrysler. Type: NOS New Old Stock. Year: 1942-1948. Model: Royal, Royal Series, Windsor, Windsor S-10, S-11.

part #: 1064942 prices

• $49.99-$89.30

specifications cranshafengin:

• for makes: Chrysler, Desoto, Mopar
• for years: 1942-1948
• brand: Mopar
• mpn: 1064942
• part type: Seal Crankshaft Cylinder
• manufacturer warranty: No
• vintage part: Yes

payments cranshafengin:

• credit card: Visa
• wallet: Apple-pay
• other

seller cranshafengin:

• # reviews: 20900
• rating: 99.7%
• city: West Newton, Massachusetts

general cranshafengin:

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

offer cranshafengin:

• quantity: 1
• best offers: True
• sold: 0
• options: Ship-to-home
• started: May 25, 2026
• availability: In Stock

returns cranshafengin:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

shipping cranshafengin:

• cost: $8.95
• service: USPS Ground Advantage
• type: Calculated
• class: Standard
• carrier: USPS
• transit: 4-9 Days

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