1. Engine Crankshafts Products
  2. sku: 19589496952470773
  3. TRQ CRANKCASE VENT COVER 74SRYP

TRQ CRANKCASE VENT COVER 74SRYP Rear Valve 850CI

fits make: Bmw. year: 1996–1997.

74sryp Trq Crankcase Vent Cover Rear Valve Fits Bmw 850ci 1996-1997

( Brand: Trq Crankcase Vent Cover ), ( Manufacturer Part Number: 74SRYP ), ( Part Type: Valve ), ( Compatible Make/model: Bmw 850ci ), ( Compatible Years: 1996 1997 96 97 ), ( Position: Rear ), ( Fitment Info: Crankcase Vent Cover ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Read Full Description To Confirm Fitment ), ( Cs-sku: 400 )

Review TRQ CRANKCASE VENT COVER Rear Valve Bmw 850ci fits 1996–1997

The **BMW 850ci (E31) Crankcase Vent Cover Rear Valve (Part #74S7RP, 1996 1997)** is a precision-engineered component designed to maintain optimal engine performance and longevity by effectively managing crankcase pressure within the vehicle s lubrication system. This high-quality vent cover is specifically tailored for the rear valve cover application on the iconic 8.6-liter M88 V12 engine, ensuring a seamless fit and reliable operation. Crafted from durable, corrosion-resistant materials, the cover features a robust, machined aluminum construction that not only enhances its structural integrity but also reduces weight, contributing to the vehicle s refined handling and performance. The design incorporates a precise sealing interface with the valve cover, preventing oil leaks and minimizing the risk of contamination from external debris, which is critical for maintaining the engine s efficiency and longevity. The vent cover also plays a vital role in the engine s breathing system, allowing crankcase gases to escape safely while preventing backpressure buildup, which can lead to oil leaks or reduced engine performance. For enthusiasts and restorers seeking to preserve the original integrity of their BMW 850ci, this genuine or high-quality aftermarket replacement ensures compatibility with the vehicle s intricate mechanical systems, including the oil filter housing and associated components. Whether installed during routine maintenance or as part of a comprehensive engine rebuild, this vent cover exemplifies BMW s commitment to engineering excellence, delivering both form and function for the discerning owner of this legendary luxury sedan.

### **Pros and Cons of Buying a Crankcase Vent Cover (Part Number 74S7RP) for a BMW 850i (1996 1997) Rear Valve Engine**

#### **Pros:**

1. **Prevents Oil Contamination** The crankcase vent cover (also known as a PCV or breather system component) helps regulate pressure in the engine bay, preventing oil from leaking into the intake system or being expelled into the atmosphere. Without it, oil can foul spark plugs, intake valves, or even enter the cabin through the HVAC system.

2. **Improves Engine Efficiency** A properly functioning breather system ensures optimal airflow, reducing vacuum leaks and improving combustion efficiency. This can lead to better fuel economy and smoother engine operation.

3. **Reduces Emissions** The vent cover helps manage blow-by gases, preventing excessive hydrocarbons from escaping into the exhaust system, which could trigger check engine lights or emissions failures.

4. **Prevents Engine Damage** Over time, without proper ventilation, excessive pressure can cause oil leaks, gasket failures, or even catastrophic engine damage (e.g., blown head gaskets or cracked cylinder heads).

5. **OEM Fitment** This part is an original BMW component, meaning it should fit perfectly without modifications. Using an aftermarket replacement that doesn t match the OEM design could lead to leaks or improper sealing.

6. **Easy Installation** The part is relatively straightforward to replace, typically requiring only basic tools (sockets, a new gasket, and possibly a torque wrench for proper tightening).

7. **Prevents Long-Term Issues** Ignoring a failing breather system can lead to more expensive repairs down the line, such as replacing intake manifolds, spark plugs, or even the entire engine in severe cases.

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#### **Cons:**

1. **Potential for Counterfeit Parts** Some aftermarket or eBay sellers may offer fake or low-quality replacements. A poor-quality vent cover could leak, fail prematurely, or not function correctly, negating the benefits.

2. **Gasket Replacement Required** The vent cover uses a gasket (often a paper or silicone type) that may degrade over time. If the old gasket is damaged, it must be replaced to ensure a proper seal. Forgetting this step can lead to leaks.

3. **Limited Availability of OEM Parts** While BMW still sells OEM parts, they can be expensive, and finding a genuine 74S7RP cover may require ordering from a BMW dealer or authorized distributor. Third-party suppliers may offer compatible but not identical parts.

4. **Possible Misidentification** The 850i (1996 1997) rear valve engine (M70) has a few variations, and ensuring the correct part number is critical. Mixing up the vent cover with a front valve or different engine model could result in improper fitment.

5. **Labor Costs if Professional Installation is Needed** While DIY installation is possible, some owners may prefer a mechanic, especially if they lack experience with BMW engines. Labor costs can add up if the job requires additional diagnostics (e.g., checking for vacuum leaks).

6. **Secondary Symptoms May Persist** If the engine has other underlying issues (e.g., worn piston rings, a failing head gasket, or a clogged PCV valve), replacing just the vent cover may not fully resolve all symptoms. A thorough inspection may be needed.

7. **Environmental Concerns (If Ignored)** While not a direct con of the part itself, failing to maintain the breather system contributes to oil pollution. Improperly vented engines can release oil into the environment, which is both ecologically harmful and potentially illegal in some regions.

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### **Conclusion:**

Replacing the crankcase vent cover (74S7RP) on a 1996 1997 BMW 850i rear valve engine is a **highly recommended maintenance task** that prevents costly long-term damage. The benefits such as protecting the engine from oil contamination, improving efficiency, and avoiding emissions-related issues far outweigh the minor drawbacks, which are mostly related to part quality, installation precision, or potential misidentification.

The key to success is:

- **Using a genuine or high-quality aftermarket replacement** (preferably from a reputable supplier).

- **Replacing the gasket** to ensure a proper seal.

- **Verifying the correct part number** for the rear valve M70 engine.

- **Checking for related issues** (e.g., PCV valve function, intake leaks) if symptoms persist after installation.

If the engine is running poorly or showing signs of oil fouling (e.g., white smoke, oil in the intake, or check engine lights), addressing the vent cover is a **practical and cost-effective first step** before considering more invasive repairs.

### **Recommendation:**

- **Purchase the part from a trusted source** (BMW dealer, reputable online retailer, or a mechanic with access to OEM parts).

- **Follow BMW s service manual** for proper installation, including torque specifications and gasket replacement.

- **Inspect the surrounding components** (hoses, PCV valve, intake manifold) for wear or leaks while the engine is disassembled.

- **Monitor the engine s performance** after installation to ensure the issue is resolved.

If unsure about DIY installation, consult a BMW specialist to avoid mistakes that could lead to further damage. For most owners with basic mechanical skills, this is a **straightforward and worthwhile repair** that extends the life of the engine.

Details:

12 Month Warranty. Rear TRQ Crankcase Vent Valve fits BMW 850Ci 1996 - 1997 74SRYP: Position: Brand: condition: New Detailed Applications Years: Vehicle: 1996 - 1997 BMW.

part #: 74sryp price

  • $43.34

specifications cranshafengin:

  • for makes: Bmw
  • for years: 1996-1997
  • brand: Trq Crankcase Vent Cover
  • mpn: 74sryp
  • part type: Valve
  • compatible make/model: Bmw 850ci
  • compatible years: 1996 1997 96 97
  • position: Rear
  • fitment info: Crankcase Vent Cover
  • manufacturer warranty: 12 Month Warranty
  • attention: Read Full Description To Confirm Fitment
  • cs-sku: 400

returns cranshafengin:

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

offer cranshafengin:

  • options: Ship-to-home
  • availability: In Stock
  • started: March 30, 2026
  • sold: 0
  • quantity: 1

general cranshafengin:

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

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  • city: Dallas, Texas
  • rating: 99.1%
  • # reviews: 23579

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for makes: bmw, for years: 1996-1997, part type: valve, compatible make/model: bmw 850ci, compatible years: 1996 1997 96 97, position: rear, fitment info: crankcase vent cover, manufacturer warranty: 12 month warranty, attention: read full description to confirm fitment, cs-sku: 400,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19589496952470773,
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  • New. Offer #1 priced at $43.34 + $0.00 shipping estimate = $43.34* total. 12 Month Warranty 1996-1997 BMW 850Ci.FREE SHIPPING

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