GM 12338877 Timing Chain Tensioner

( Brand: Gm ), ( Manufacturer Part Number: 12338877 ), ( Type: Tensioner ), ( Warranty: 1 Year ), ( Placement On Vehicle: Front ), ( Make: Buick ), ( Year: 1987 1988 1989 1990 1991 ), ( Fitment Type: Direct Replacement ), ( Certification: Genuine Oem )

Review GM Genuine Buick Chevrolet Oldsmobile Timing Chain Tensioner fits 1987–1991

The GM 12338877 timing chain tensioner is a crucial component in the engine's timing system for select Buick, Chevrolet, and Oldsmobile models produced between 1987 and 1991. This tensioner's primary function is to maintain the proper tension on the timing chain, ensuring the engine's valves and pistons open and close at the correct times.

This tensioner is a hydraulic unit, meaning it uses engine oil pressure to apply tension to the timing chain. The design includes an internal piston that presses against the timing chain, held in place by a hydraulic plunger and a spring. The tensioner housing is typically made of a durable material like aluminum, while the piston and plunger are constructed from heat-treated steel for added strength.

When the engine is running, oil pressure from the engine builds up in the tensioner housing. This pressure forces the hydraulic plunger to move, which in turn moves the piston and applies tension to the timing chain. When the engine is not running, the spring in the tensioner holds the piston against the timing chain, maintaining tension.

This GM 12338877 timing chain tensioner is designed to fit specific Buick, Chevrolet, and Oldsmobile models, ensuring a proper fit and function. It is essential to replace a worn-out or failing tensioner to prevent potential engine damage. Symptoms of a faulty timing chain tensioner include rattling noises from the engine, rough idling, and difficulty starting the engine.

To install the new timing chain tensioner, the engine must be removed from the vehicle or the timing covers must be removed to access the timing chain and tensioner. The installation process may vary depending on the specific model and engine configuration. It is recommended to follow the manufacturer's instructions carefully or consult a professional mechanic for assistance.

In summary, the GM 12338877 timing chain tensioner is a vital component in the engine's timing system for select Buick, Chevrolet, and Oldsmobile models from 1987 to 1991. Its hydraulic design allows it to maintain proper timing chain tension, ensuring the engine runs smoothly. When it's time for replacement, this tensioner can be installed with careful attention to detail and the proper tools.

The timing chain tensioner (part number 12338877) is a crucial component in the engine of 1987-1991 Buick, Chevrolet, and Oldsmobile vehicles. This part is responsible for maintaining the correct tension on the timing chain, which is essential for proper engine operation. Here are some pros and cons of buying this part to help you make an informed decision.

1. Improved Engine Performance: A worn-out or failing timing chain tensioner can cause engine misfires, rough idling, and poor fuel economy. Replacing this part can lead to improved engine performance and increased fuel efficiency.

2. Prevents Costly Engine Damage: A faulty timing chain tensioner can cause the timing chain to slack, leading to contact between the pistons and the valves, resulting in expensive engine damage. Replacing this part can prevent such damage and save you money in the long run.

3. Peace of Mind: Knowing that your engine's timing chain tensioner is in good working order can give you peace of mind and confidence in your vehicle's reliability.

1. Labor Costs: The process of replacing the timing chain tensioner can be labor-intensive and time-consuming, which can add to the overall cost of the repair.

2. Potential for Other Issues: Replacing the timing chain tensioner may uncover other issues that need to be addressed, such as worn-out timing chain guides or water pump bearings, which can add to the cost of the repair.

3. Availability: The availability of this part may vary depending on your location and the specific make and model of your vehicle.

Replacing the timing chain tensioner (part number 12338877) on 1987-1991 Buick, Chevrolet, and Oldsmobile vehicles can lead to improved engine performance, prevent costly engine damage, and provide peace of mind. However, labor costs, potential for other issues, and availability are some factors to consider before making a purchase. Ultimately, weighing the pros and cons can help you make an informed decision.

If you're experiencing symptoms of a failing timing chain tensioner, such as rough idling, engine misfires, or poor fuel economy, it's recommended to have the part inspected and replaced as soon as possible to prevent further engine damage and save money in the long run. When purchasing the part, consider buying it from a reputable supplier to ensure its quality and availability. Additionally, make sure to have the part installed by a qualified mechanic to ensure proper installation and function.

Details:

Quirk Parts, Tensioner. Genuine GM Part Number: 12338877.

part #: 12338877 price

• $46.79

specifications tensionpull:

• for makes: Buick, Chevrolet, Oldsmobile
• for years: 1987-1991
• brand: Gm
• mpn: 12338877
• type: Tensioner
• warranty: 1 Year
• placement on vehicle: Front
• make: Buick
• year: 1987 1988 1989 1990 1991
• fitment type: Direct Replacement
• certification: Genuine Oem

general tensionpull:

• Engines Engine Parts > Timing Components Kits > Tensioners Pulleys
• condition: New

returns tensionpull:

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

payments tensionpull:

• wallet: Paypal
• credit card: Mastercard
• other

seller tensionpull:

• rating: 99.8%
• # reviews: 1183757
• city: Braintree, Massachusetts

shipping tensionpull:

• cost: $0.00
• service: UPS Ground
• type: Fixed
• carrier: UPS
• transit: 3-7 Days
• class: Standard

offer tensionpull:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: May 5, 2026
• quantity: 1
• best offers: True

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