BUICK 303.GM4321 Engine Crankshaft Crank Shaft 1.4
fits model: 303, Encore. make: Buick. year: 2018–2022.
( Model: ENCORE ), ( Part Type: Engine Crankshaft Crank Shaft ), ( Conditions Options: 4, 1.4, At, Awd ), ( Genuine Oem: Yes ), ( Ipn: 303.gm4321 ), ( Year: 2021 ), ( Descriptionpartcondition: The Pictures Are Of The Exact Part You Will Recieve. This Is A Hi ), ( Manufacturer Warranty: 60 Day )
Review BUICK Engine Crankshaft Crank Shaft 1.4 Oem fits ENCORE 303 2018–2022
The **Buick 303 (GM4321) Encore Engine Crankshaft** is a precision-engineered component designed to deliver exceptional performance, durability, and reliability in the compact yet powerful **2.0L turbocharged inline-4 (LZ4) engine** found in the **2018 2022 Buick Encore GX**. Crafted from high-grade **forged steel**, this crankshaft is meticulously machined to exacting specifications, ensuring optimal balance, strength, and longevity under the demanding conditions of turbocharged operation. The **five-main-bearing design** provides superior load distribution, reducing vibration and wear while maintaining smooth operation even at high RPMs. Engineered with **precision-ground journals and counterweights**, this crankshaft minimizes friction and enhances overall engine efficiency, contributing to the Encore GX s responsive acceleration and refined driving experience. Whether installed in a brand-new vehicle or as a high-quality replacement for a worn or damaged original, this crankshaft is built to meet the exacting standards of General Motors **LZ4 engine architecture**, ensuring seamless integration with the connecting rods, bearings, and timing system. Its robust construction and advanced manufacturing processes make it an ideal choice for enthusiasts seeking to restore or upgrade their Buick Encore GX, guaranteeing reliable performance for thousands of miles.
### **Pros and Cons of Buying a Used Buick 303 (GM4321 Encore Engine) with a Crankshaft Issue (2018 2022 Models)**
#### **Overview of the GM4321 Encore Engine**
The **GM4321 Encore engine** (also known as the **1.4L turbocharged 4-cylinder**) is used in Buick s **Encore, Regal, and some Cadillac models**. It is a modern, fuel-efficient, and turbocharged engine designed for compact vehicles. However, like many turbocharged engines, it has faced **crankshaft and timing chain issues**, particularly in the **2018 2022 model years**.
---
### **Pros of Buying a Used Buick with This Engine (Despite Crankshaft Issues)**
1. **Fuel Efficiency**
- The 1.4L turbo engine is **one of the most efficient in its class**, offering **30 35 MPG combined** (higher than many V6 or larger engines).
- Good for city driving and those who prioritize **lower fuel costs**.
2. **Modern Technology & Features**
- Equipped with **direct injection, turbocharging, and advanced fuel systems**, making it more efficient than older naturally aspirated engines.
- Many models come with **standard AWD (in Encore), modern infotainment, and driver aids** (adaptive cruise, lane-keep assist, etc.).
3. **Lower Operating Costs (Compared to V6/Diesel Alternatives)**
- **Cheaper insurance** than a V6 or turbocharged V6 (like the 2.0L turbo in some Buicks).
- **Lower maintenance costs** than a diesel or larger engine (though turbocharged engines require **more frequent oil changes and cooling system checks**).
4. **Buick s Warranty & Recall Coverage**
- Some **2018 2020 models** may still have **unexpired factory warranties** (especially if bought from a dealership with transferable coverage).
- **GM has issued recalls** for **timing chain and crankshaft position sensor issues** buying a **recall-fixed vehicle** reduces long-term risk.
5. **Potential for Reliability Improvements**
- **2021 2022 models** saw **some refinements** in the engine control software and timing chain design, reducing early failure rates.
- If the **crankshaft issue is minor (e.g., worn bearings but no catastrophic failure)**, a **rebuild or replacement** may be cheaper than a full engine swap.
6. **Good for City & Short-Trip Driving**
- Turbocharged engines **handle stop-and-go traffic well** when properly maintained.
- If the **cooling system is intact**, overheating (a common turbo failure mode) can be avoided.
---
### **Cons of Buying a Used Buick with Crankshaft/Timing Chain Issues**
1. **Crankshaft & Timing Chain Failures (Most Critical Issue)**
- **2018 2020 models** have had **reported crankshaft bearing failures**, leading to **engine seizing** if not addressed.
- **Timing chain stretch/breakage** can cause **misalignment, valve damage, or catastrophic engine failure**.
- **Symptoms:**- **Rough idling, knocking noises, check engine lights (P0016, P0017 for timing chain issues).**
- **Oil consumption** (if piston rings are worn due to crankshaft issues).
- **Overheating** (if cooling system is failing, which often accompanies turbocharged engine problems).
2. **High Repair Costs for Crankshaft/Timing Chain**
- **Crankshaft replacement** (if bearings are shot) can cost **$2,500 $4,500 ** (labor-intensive, requires engine removal).
- **Timing chain & tensioner replacement** is **$1,500 $3,000** (often requires **removing the turbo and related components**).
- **If the engine is seized**, a **full rebuild or replacement** may be needed (**$5,000 $8,000 **).
3. **Turbocharger & Cooling System Weaknesses**
- **Turbocharged engines are more prone to:**- **Oil leaks** (from turbo seals).
- **Intercooler failure** (leading to poor performance).
- **Coolant leaks** (from the **turbocharger oil cooler**, a known weak point).
- **If the cooling system fails**, **turbo damage and engine overheating** can occur quickly.
4. **Resale Value & Long-Term Reliability Concerns**
- **Buicks with this engine have lower resale value** compared to **V6 or diesel alternatives** (e.g., Buick Regal with 2.0L turbo or GMC Duramax diesel).
- **Early models (2018 2019) have higher failure rates** than later ones (2021 2022).
- **No long-term track record** GM has only had this engine since **2018**, so **unknown long-term durability risks**.
5. **Maintenance Requirements Are Higher**
- **Oil changes every 5,000 7,500 miles** (due to turbocharged engine demands).
- **Coolant flushes every 30,000 50,000 miles** (critical for turbocharged engines).
- **Timing chain inspection every 60,000 100,000 miles** (some mechanics recommend earlier checks).
- **Turbo inspection if oil consumption increases** (can lead to **carbon buildup and reduced power**).
6. **Potential for Hidden Damage**
- **If the engine seized or had a timing chain failure**, **valve damage or piston scuffing** may have occurred, requiring **expensive repairs**.
- **Check for:**- **Burnt oil smell** (indicates turbo or valve issues).
- **Excessive exhaust smoke** (blue smoke oil burning, white smoke coolant leak).
- **Rough shifting or hesitation** (could indicate **fuel pump or injector issues**).
---
### **Key Questions to Ask Before Buying**
1. **Has the engine had any major work?**
- **Ask for service records** look for **timing chain replacements, crankshaft inspections, or turbo repairs**.
- **If no records exist, assume the worst.**
2. **Has the vehicle had a timing chain failure or crankshaft knock?**
- **If yes, was it fixed properly?** (Some cheap fixes lead to **recurring issues**.)
- **Ask if the seller replaced the crankshaft or just the bearings.**
3. **What is the oil consumption like?**
- **Normal for a turbo engine is 1 quart per 1,000 1,500 miles.**
- **If it s burning oil excessively, the turbo or piston rings may be failing.**
4. **Has the turbocharger been replaced?**
- **Turbo failure is expensive ( $2,000 $3,500).**
- **Check for oil leaks around the turbo area.**
5. **Has the cooling system been serviced?**
- **Turbocharged engines overheat easily check for coolant leaks, a functioning thermostat, and radiator condition.**
6. **Does the vehicle have any active recalls?**
- **Check GM s recall database** ( www.gmrecalls.com (https://www.gmrecalls.com)) to ensure **timing chain and crankshaft issues are fixed**.
7. **What is the maintenance history like?**
- **If the seller can t provide records, walk away.**
- **A well-maintained turbo engine should have:**- **Regular oil changes (synthetic, high-quality).**
- **Coolant flushes every 30K 50K miles.**
- **No history of neglect (e.g., running on low oil, no inspections).**
---
### **Recommendation: Should You Buy It?**
#### **Buy Only If:****The vehicle has a clean service history** (timing chain replaced, crankshaft inspected, no oil leaks).
**The seller provides proof of all major repairs** (especially crankshaft/timing chain work).
**You can afford a **$3,000 $5,000 buffer** for potential future issues (even if the engine seems fine now).
**You re buying from a reputable dealer or private seller with full transparency.**
**The engine runs smoothly with no knocks, misfires, or excessive oil consumption.**
**You re okay with **higher maintenance costs** than a naturally aspirated engine.**
#### **Avoid If:****No service records exist** (especially for 2018 2020 models).
**The seller can t confirm timing chain or crankshaft condition.**
**There are signs of **oil burning, overheating, or rough running** (even if minor).
**You can t afford **$3,00
Details:
Stock Number - 2563. Donor Vehicle - 2021 ENCORE. It is stored in doors and ready to be shipped. Warranty: All parts come with our standard 60 day warranty.
4 ,1.4,AT,AWD.
specifications cranshafengin:
- for models: 303, Encore
- for makes: Buick
- for years: 2018-2022
- model: Encore
- part type: Engine Crankshaft Crank Shaft
- conditions options: 4, 1.4, At, Awd
- genuine oem: Yes
- ipn: 303.gm4321
- year: 2021
- descriptionpartcondition: The Pictures Are Of The Exact Part You Will Recieve. This Is A Hi
- manufacturer warranty: 60 Day
offer cranshafengin:
- best offers: True
- quantity: 1
- started: May 6, 2026
- options: Ship-to-home
- sold: 0
- availability: In Stock
general cranshafengin:
- Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
- condition: Used
payments cranshafengin:
- other
- wallet: Apple-pay
- credit card: Visa
shipping cranshafengin:
- cost: $0.00
- type: Fixed
- class: Standard
- service: UPS Ground
- transit: 2-5 Days
- carrier: UPS
seller cranshafengin:
- rating: 99.7%
- # reviews: 29588
- city: Sauk Centre, Minnesota
returns cranshafengin:
- paid by: Buyer
- time: 60 Days
- policy: Returns Accepted
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