SUBARU 10100CD020 Engine Longblock 2.5 A/t 161K

( Manufacturer Part Number: 10100CD020 ), ( Items Included: Camshaft, Cylinder Head, Oil Pan, Oil Pump, Timing Chain, Timing Cover, Valve Covers, Water Pump ), ( Vintage Part: No ), ( Fuel Type: Gasoline ), ( Type: Engine Long Block ), ( Manufacturer Warranty: 1 Month ), ( Engine Size: 2.5 L ), ( Block Type: Flat ), ( Number Of Valves: 16 ), ( Country Of Origin: Japan )

Review SUBARU Sedan 2.5 A/t Engine Longblock 161k fits LEGACY 2017

The Subaru 10100CD020 engine longblock is a replacement component designed for Subaru vehicles manufactured in 2017. This engine longblock is specifically engineered for 2.5-liter, flat-four, automatic transmission (A/T) engines that have accumulated approximately 161,000 kilometers (100,000 miles) on the odometer.

This longblock is a critical engine component that includes the cylinder block, crankshaft, pistons, connecting rods, and various bearings. The cylinder block is made of aluminum alloy for optimal strength and weight reduction. The crankshaft is forged from high-strength steel and precisely machined to ensure accurate rotational dimensions. The pistons are also forged from aluminum alloy, and they feature a ring groove design that facilitates proper ring sealing. The connecting rods are made of steel and are designed to efficiently transmit engine power to the crankshaft.

The bearings included in this longblock are manufactured to exacting standards to ensure that they provide minimal friction and maximum durability. The main bearings, which support the crankshaft, are precision-machined to ensure proper alignment and clearance. The rod bearings, which support the connecting rods, are designed to provide adequate clearance for piston travel and to minimize friction between the piston and the crankshaft.

This engine longblock is designed to meet or exceed OEM specifications, ensuring that it provides reliable performance and longevity. It is important to note that installation should only be performed by a qualified technician to ensure proper alignment and clearance of various engine components. Additionally, it is recommended that all related engine components, such as the timing chain, water pump, and gaskets, be inspected and replaced as needed during the installation process to ensure optimal engine performance.

In summary, the Subaru 10100CD020 engine longblock is a high-quality replacement component designed for Subaru 2.5-liter, flat-four, automatic transmission engines with around 161,000 kilometers (100,000 miles) on the odometer. It includes the cylinder block, crankshaft, pistons, connecting rods, and various bearings, all of which are manufactured to meet or exceed OEM specifications for reliable performance and longevity. It is essential that installation is performed by a qualified technician to ensure proper alignment and clearance of various engine components.

Pros and Cons of Buying a 2017 Subaru 2.5L Atkinson-Cycle Engine Longblock (161k miles)

The Subaru 2.5L Atkinson-Cycle engine (code: FA25F) is known for its efficiency and longevity. However, buying a used longblock (an engine without its accessories) with 161,000 miles (259,052 kilometers) can come with potential advantages and disadvantages. In this analysis, we will discuss both the pros and cons of purchasing this engine longblock.

1. Cost-effective: Buying a used engine longblock could save you a significant amount of money compared to purchasing a new or even a rebuilt engine from the dealership.

2. Availability: Given the popularity of the Subaru brand, it is more likely to find a used 2.5L Atkinson-Cycle engine longblock than a newer or less common engine.

3. Potential for DIY repairs: If you're an experienced DIY mechanic, a used engine longblock can provide an opportunity to work on your vehicle and potentially save on labor costs.

4. Reliability: Subaru engines are known for their robustness and longevity. With proper maintenance, the 2.5L Atkinson-Cycle engine may still have some useful life left.

1. Unknown maintenance history: A used engine longblock comes without any documentation regarding its previous maintenance or repairs, which could lead to potential issues in the future.

2. Potential for hidden damage: A used engine longblock may have undetected damage, such as cracks or leaks, which could lead to unexpected repairs or replacements.

3. Compatibility concerns: Ensure that the longblock is compatible with your specific vehicle model and any modifications you may have made.

4. Additional costs: Installing a used engine longblock requires additional labor and parts costs, such as gaskets, seals, and other necessary components.

The decision to buy a 2017 Subaru 2.5L Atkinson-Cycle Engine Longblock (161k miles) depends on your individual circumstances and priorities. If you're looking for a cost-effective solution, have the necessary skills and resources for DIY repairs, and are confident in the engine's potential compatibility and maintenance history, then this option could be worth considering. However, if you prefer the peace of mind that comes with a new or rebuilt engine, or if the potential risks outweigh the benefits for you, it may be best to explore alternative engine solutions.

Before making a decision, thoroughly research the engine longblock's history, compatibility, and potential risks. Obtain as much information as possible about the engine's maintenance history and consider having it inspected by a trusted mechanic. Weigh the potential costs, benefits, and risks carefully, and consult with professionals if necessary. Ultimately, the best choice depends on your budget, skill level, and personal preferences.

Details:

It is highly recommended to have all timing belt kits/head gaskets/spark plugs/oil pan gaskets and any other preventative maintenance items be performed before installation. Item may have imperfections from being a used item. CT transmission model. Item may show signs of scuffs or scratches.

Hardware and gaskets not included. Engine code AY/FB25BAYHCA. 2017 Subaru Legacy 2.5i sedan. Item is in good used working condition.

Part number 10100CD020. 161,000 miles on donor vehicle. Engine longblock Assembly.

part #: 10100cd020 prices

• $999.99-$1282.40

specifications grokengines:

• for models: Legacy
• for makes: Subaru
• for years: 2017
• mpn: 10100cd020
• items included: Camshaft, Cylinder Head, Oil Pan, Oil Pump, Timing Chain, Timing Cover, Valve Covers, Water Pump
• vintage part: No
• fuel type: Gasoline
• type: Engine Long Block
• manufacturer warranty: 1 Month
• engine size: 2.5 L
• block type: Flat
• number of valves: 16
• country of origin: Japan

payments grokengines:

• other
• credit card: Discover
• wallet: Paypal

seller grokengines:

• # reviews: 482
• city: Shirley, Massachusetts
• rating: 99.3%

offer grokengines:

• options: Ship-to-home
• quantity: 1
• started: January 10, 2026
• sold: 0
• availability: In Stock
• best offers: True

general grokengines:

• Car Truck Parts Accessories > Engines Engine Parts > Engines
• condition: Used

returns grokengines:

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

shipping grokengines:

• type: Fixed
• service: Flat Rate Freight
• cost: $375.00
• class: Freight

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