GM Rear Crankshaft Bearing Cap Seal 01647308

( Brand: Gm ), ( Manufacturer Part Number: 1647308 ), ( Type: Rear Crankshaft Main Bearing Cap Seal ), ( Warranty: 1 Year ), ( Placement On Vehicle: Rear ), ( Make: Cadillac ), ( Year: 1993 1994 1995 1996 1997 ), ( Fitment Type: Direct Replacement ), ( Certification: Genuine Oem )

Review GM Genuine Oldsmobile Rear Crankshaft Main Bearing Cap Seal fits 1993–1997

The **GM 1647308 rear crankshaft bearing cap seal** from the **1993 1997 Oldsmobile** lineup is a precision-engineered rubber component designed to maintain the critical oil seal integrity between the rear main bearing cap and the crankshaft housing. This seal is a vital part of the engine s lubrication system, ensuring that engine oil remains contained within the crankcase while preventing contaminants from infiltrating the internal components. Crafted from high-quality rubber compound, this seal is engineered to withstand the thermal expansion and contraction of the engine block, as well as the mechanical stress imposed by the crankshaft s rotation, which can reach thousands of RPM in high-performance applications. The **1647308** part number corresponds specifically to the rear main bearing cap seal for Oldsmobiles equipped with the **3100, 3400, or 4000 V6 and V8 engines**, making it a critical replacement for models like the **Cutlass Supreme, Aurora, Intrigue, and Silhouette**, where oil leaks from the rear main seal can lead to catastrophic engine failure if left unaddressed. Proper installation requires careful alignment with the bearing cap s oil passage and the use of a clean, smooth surface to prevent premature wear or deformation. Over time, this seal may degrade due to exposure to heat, oil breakdown, or physical damage, necessitating periodic inspection and replacement as part of routine engine maintenance. Replacing this seal with the correct **GM 1647308** ensures long-term reliability and helps preserve the engine s performance and longevity.

### **Pros and Cons of buying a GM Part Number 1647308 (1993 1997 Oldsmobile Rear Crankshaft Bearing Cap Seal)**

1. **Direct Fitment** This is an OEM (Original Equipment Manufacturer) or high-quality aftermarket replacement designed specifically for your 1993 1997 Oldsmobile engine. It should align perfectly with the crankshaft bearing cap, reducing the risk of misalignment or improper sealing.

2. **Reliability** GM parts, especially those from reputable suppliers, are engineered to meet the same standards as factory components. A quality seal ensures proper lubrication retention and prevents oil leaks, which can extend the life of your engine.

3. **Prevents Engine Damage** A failing rear main seal can lead to oil leaks into the transmission or differential, causing severe damage if left unaddressed. Replacing it with a proper seal mitigates this risk.

4. **Ease of Installation** Since it s a direct replacement, installation should be straightforward if you have basic mechanical skills. The part is designed to fit the existing mounting points without modifications.

5. **Cost-Effective Long-Term Solution** While the upfront cost may seem higher than a cheap generic seal, a durable seal prevents costly transmission or differential repairs down the line.

---

1. **Age of the Part** This part was produced over 20 years ago, and while it may still be available, the material quality could differ from modern formulations. Some older seals may degrade faster or become brittle over time.

2. **Potential Counterfeit or Low-Quality Replicas** If purchasing from an unknown seller, there s a risk of receiving a knockoff that doesn t meet GM s specifications. This could lead to leaks or premature failure.

3. **Limited Availability** As parts age, sourcing may become difficult, especially from authorized GM dealers. You may need to rely on specialty auto parts suppliers or eBay, which could increase the risk of counterfeit items.

4. **Additional Labor Costs** If you re not comfortable with engine disassembly, professional installation may be required, adding to the total expense. Some mechanics charge a premium for rear main seal replacements due to the complexity of the job.

5. **Compatibility Concerns** While this part is listed for your Oldsmobile, slight variations in engine design (e.g., different crankshaft diameters or seal grooves) could occur. Always verify fitment before purchasing.

---

The **GM 1647308 rear crankshaft bearing cap seal** is a solid choice for maintaining your 1993 1997 Oldsmobile s engine integrity. Its direct fitment and reliability make it a preferable option over generic or low-quality alternatives. However, the part s age and potential availability issues mean you should source it from a trusted supplier to avoid counterfeit or degraded components.

If you re replacing the seal due to a leak, addressing the root cause (e.g., worn crankshaft or improper torque) is also critical to ensure long-term success. While the upfront cost may be higher than cheaper alternatives, the long-term benefits preventing oil leaks and engine damage justify the investment.

- **Purchase from a reputable source**, such as an authorized GM parts dealer, RockAuto, or a trusted online retailer with verified reviews.

- **Inspect the part upon arrival** to ensure it matches the original specifications (e.g., rubber quality, proper sizing).

- **Consider professional installation** if you lack experience with engine disassembly, as improper handling can damage the crankshaft or seal.

- **Check for complementary parts** (e.g., gaskets, bolts) that may need replacement during the same service to avoid future issues.

- **Monitor the seal post-installation** for leaks, and replace it again if oil seepage occurs within a reasonable timeframe.

For maximum assurance, if available, a **modern aftermarket seal** (e.g., Fel-Pro, Sealed Power) designed for compatibility with your engine may offer better durability than an older GM part. However, if you prefer OEM quality, the 1647308 is a reasonable choice when sourced correctly.

Details:

Genuine GM Part Number: 1647308. Quirk Parts, Rear Crankshaft Main Bearing Cap Seal.

part #: 1647308 prices

• $12.95-$49.70

specifications cranshafengin:

• for makes: Oldsmobile
• for years: 1993-1997
• brand: Gm
• mpn: 1647308
• type: Rear Crankshaft Main Bearing Cap Seal
• warranty: 1 Year
• placement on vehicle: Rear
• make: Cadillac
• year: 1993 1994 1995 1996 1997
• fitment type: Direct Replacement
• certification: Genuine Oem

returns cranshafengin:

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

payments cranshafengin:

• other
• wallet: Google-pay
• credit card: Discover

shipping cranshafengin:

• service: UPS Ground
• class: Standard
• carrier: UPS
• cost: $0.00
• transit: 4-10 Days
• type: Fixed

seller cranshafengin:

• # reviews: 1130766
• city: Quincy, Massachusetts
• rating: 99.6%

offer cranshafengin:

• availability: In Stock
• started: February 3, 2026
• quantity: 1
• best offers: True
• sold: 0
• options: Ship-to-home

general cranshafengin:

• Transmission Drivetrain > Differentials, Assemblies Parts > Differential Bearings
• condition: New

Gm 1647308 Is Similar To:

• 056 582746 Gm Oldsmobile Oe Crankshaft (45.2% similar) Please feel free to with any questions. 010 mains, there is some ware, please refer to photos for condition...(May 11th, 2018)
• 10044958 Gm Buick Chevrolet Oldsmobile Pontiac Genuine Pulley (38.1% similar) Parts must be resalable and in the original packaging. Shipping carrier substitutions may be made at our determination in an attempt to reduce cost the customer. Electrical parts are not returnable. You can trust to be your source for all Gm parts needs. Our Gm parts team is here to help...(March 22nd, 2018)
• 10083171 Gm 1008-3171 Engine Crankshaft (35.2% similar) You are buying what is shown in the picture from me nothing more, less. I'm selling this nos Gm item...(January 15th, 2018)
• 10085753aap Acdelco Gm Original Equipment Bbc Crank Pulley Crankshaft (25.8% similar) This item is in great condition and it ready to be used. This is a used 6 groove serpentine belt pulley removed from BBC. The part number is 10085753AAP...(July 11th, 2018)
• 10112371 Gm Crankshaft Pulley Cavalier Cutlass Sunfire Century (32.4% similar) The shipping calculator is not always accurate and doesn list all options. A new old stock part does not mean that it is identical to original or in perfect condition. Offering a new Gm crankshaft pulley, part, group. If you are looking for show quality, this may not be the part. It may have factory...(March 15th, 2018)
• 10141920 Gm Crankshaft Pulley 2.2l (33.3% similar) 2l Isuzu hombre. If an item arrives damaged, please via message within 24 hours for instructions. No expedited shipping is available...(October 7th, 2017)
• 10160 Standard Crankshaft New Part Rwd Buick Chevy Oldsmobile Pont Gm (36.1% similar) All return items must be complete, undamaged, unaltered and in resale condition. Good condition, still in original box. Should fit a Gm vehicle such as Buick, Chevrolet, oldsmobile, etc. Part number 10160SEE photos for details. New listings posted daily. This is a new, unused standard crankshaft...(May 7th, 2018)
• 10227558 Gm New Harmonic Balancer Crankshaft Pulley Crank (40.6% similar) This is a picture of new Gm an oem Gm part for less than aftermarket. Why buy an aftermarket balance when you can get a new Gm part for less. This crankshaft pulley harmonic balance can not be used on a marine application. 3l harmonic balance that fits all Gm makes and model's using the this is it. ...(March 20th, 2018)
• 10250 Unbranded Gm Crankshaft 340-5.6l (30.6% similar) Buyer pays return shipping. Product images may differ from actual appearance. Fitment information may not be available for all products. We then pass those savings directly on to the consumer through an aggressive marketing strategy that keeps our overhead and sales costs a minimum. Notes: please ...(October 17th, 2017)
• 1046162 213-152 Original Gm Oem Engine Crankshaft Position Sensor Fits Chevrolet Oldsmobile (32.8% similar) Comes with a 30 day warranty. Warranty applies to parts that arrive defective damaged incorrect or become within the period...(June 18th, 2018)
• 11120 Unbranded Gm Crankshaft 5.7l-350 (32.3% similar) Gm engine crankshaft 11120, domestic parts and import components are available. Fitment information may not be available for all products. Representative image. We then pass those savings directly on to the consumer through an aggressive marketing strategy that keeps our overhead and sales costs a ...(October 17th, 2017)