Dodge 3.9L V6 Remanufactured Engine – 1986-1987

Dodge 3.9L V6 Remanufactured Engine – 1986-1987: Professional Overview

The Dodge 3.9L V6 Remanufactured Engine – 1986-1987 is a professionally remanufactured replacement engine intended for compatible Dodge vehicles equipped with the 3.9L V6 engine configuration during the specified model years.

This engine is identified by block casting #3730 and VIN code M, two important identifiers when determining whether a replacement engine corresponds with the original application. Buyers should always confirm vehicle fitment using the vehicle-specific fitment information and applicable casting numbers before ordering.

Unlike a used engine removed from a vehicle and resold in its existing condition, a remanufactured engine goes through a controlled rebuilding process. The engine is disassembled, cleaned, inspected, machined where required, fitted with replacement components, reassembled, and tested before being offered for sale.

This approach gives vehicle owners and professional installers a more structured replacement option when an original engine has reached the end of its service life.

Compatibility, Applications, and Technical Context

The supplied application information identifies this engine for 1986–1987 Dodge vehicles requiring the 3.9L V6 configuration. The 3.9L displacement, V6 architecture, block casting number, and VIN code are important identifiers for confirming compatibility.

The engine is identified as:

• Engine configuration: 3.9L V6
• Application years: 1986–1987
• Block casting: #3730
• VIN code: M
• Manufacturer/application: Dodge

Engine replacement requires more than matching displacement alone. Production year, engine configuration, casting identification, vehicle application, and other original-equipment specifications can affect interchangeability.

For that reason, customers should compare the original engine information with the vehicle fitment information before purchase. Where available, the casting number and VIN code can provide additional confirmation when evaluating a replacement engine.

The engine can also serve as a practical solution for restoration and replacement projects where maintaining the appropriate period-correct engine configuration is important.

Remanufacturing Process and Quality Control

Every engine is subjected to a comprehensive remanufacturing process rather than simply being cleaned and resold.

The process begins with a complete disassembly and deep cleaning. Cast-iron components are hot tanked, while aluminum components are thermally cleaned as appropriate. This removes accumulated contaminants and prepares the components for detailed inspection.

Critical components undergo inspection for defects that could affect reliability. Magnaflux testing is used to identify microscopic cracks and fissures in applicable metal components, while parts are also visually inspected throughout the rebuilding process.

Machining follows the inspection stage. Deck surfaces are CNC machined, and the engine receives new components as required by the remanufacturing process. These components include bearings, pistons, rings, lifters, an oil pump, gaskets, Viton valve seals, freeze plugs, and galley plugs. Depending on the engine design, the applicable timing components are also replaced.

After assembly, the engine undergoes SIM testing. The cooling and oil systems are pressurized, while the crankshaft is spun at high RPM to evaluate compression and overall build quality.

These procedures are designed to provide a more consistent replacement engine than an untested used assembly.

Engine Construction and Performance

The 3.9L V6 configuration provides the fundamental architecture required by compatible Dodge applications from the specified production period. The engine’s V6 configuration and 3.9L displacement make correct application matching particularly important when selecting a replacement.

The remanufacturing process addresses several areas that matter when installing a replacement engine, including internal wear, sealing surfaces, lubrication components, and critical rotating and reciprocating components.

New bearings, pistons, rings, lifters, oil pump, gaskets, and valve seals are incorporated as part of the stated rebuilding process. Machined surfaces and inspected components are then brought together during final assembly.

The result is a professionally rebuilt engine intended to provide a dependable foundation for a compatible vehicle restoration or replacement project.

Why Choose a Remanufactured 3.9L V6?

Replacing a failed engine is a significant repair, and buyers typically need more than a basic replacement assembly. They need confidence that the engine has been properly evaluated and prepared before installation.

A professionally remanufactured 3.9L V6 engine provides several advantages over an unidentified used engine. The assembly is disassembled and cleaned, critical components are inspected, required machining is performed, new components are installed, and the completed engine is tested.

The documented testing process also provides an important quality-control step. SIM testing verifies compression and allows the cooling and lubrication systems to be pressurized before the engine reaches the customer.

For older vehicles, matching the correct engine identification is equally important. The #3730 block casting and VIN code M provide useful reference points when comparing the replacement engine with the original unit.

Who This Engine Is Best For

This engine is best suited to customers who need a replacement 3.9L V6 engine for a compatible 1986–1987 Dodge application.

It can be appropriate for:

• Vehicle owners replacing a failed original engine
• Professional automotive repair shops
• Engine replacement specialists
• Restoration projects involving compatible Dodge vehicles
• Buyers looking for a remanufactured alternative to an untested used engine

It is particularly important for buyers to verify compatibility before ordering. Engine displacement alone should not be treated as sufficient confirmation because vehicle-specific configurations and engine identification details can affect fitment.

Technical Specifications

Ordering, Fitment, and Support

Correct fitment should be confirmed before ordering the Dodge 3.9L V6 Remanufactured Engine – 1986-1987. Customers should compare their vehicle information with the applicable vehicle fitment data and, where relevant, verify the #3730 block casting number and VIN code M.

This is particularly important for older vehicles because engine configurations can vary between production periods and applications. Confirming the engine identification before purchase can help prevent compatibility issues during installation.

Customers can also explore related remanufactured engines and other engine components when completing a replacement project. Where additional components are required for installation, selecting compatible parts alongside the engine can simplify the replacement process.

The engine is backed by the stated warranty program, providing additional purchasing confidence when selecting a professionally remanufactured replacement rather than an untested used engine.

Frequently Asked Questions

What is the Dodge 3.9L V6 Remanufactured Engine?

The Dodge 3.9L V6 Remanufactured Engine – 1986-1987 is a rebuilt replacement engine for compatible Dodge applications. It uses a 3.9L V6 configuration and is identified by block casting #3730 and VIN code M. The engine is disassembled, cleaned, inspected, machined, rebuilt with replacement components, and SIM tested before sale.

What years does this 3.9L Dodge engine fit?

The supplied application information identifies this 3.9L V6 remanufactured engine for compatible Dodge applications from 1986 through 1987. Because engine configurations can vary, buyers should confirm their specific vehicle’s fitment and compare the original engine identification before ordering.

How is this Dodge 3.9L V6 engine remanufactured?

The engine is completely disassembled and deeply cleaned before inspection. Applicable components undergo Magnaflux testing and visual inspection, while deck surfaces are CNC machined. New internal and sealing components are installed as specified, followed by assembly and SIM testing to evaluate compression and build quality.

What is the block casting number for this engine?

The supplied product information identifies the block casting number as #3730. This number can be useful when comparing the replacement engine with the original engine during the fitment process. Buyers should use casting information together with vehicle-specific fitment details rather than relying on the casting number alone.

What does SIM testing involve?

SIM testing is performed after the engine has been rebuilt. The cooling and oil systems are pressurized, and the crankshaft is spun at high RPM to verify compression and evaluate the overall build quality. This provides an additional quality-control stage before the remanufactured engine is supplied.

Does the engine come with a warranty?

The supplied product information states that remanufactured engines are covered by up to 7 years and 1 million miles of warranty, with the exact coverage subject to the applicable warranty terms. Additional protection options may also be available depending on the purchasing arrangement.

How should I confirm fitment before buying?

Start by comparing your vehicle’s year, engine displacement, engine configuration, and available identification information with the product’s fitment details. For this engine, 3.9L V6, block casting #3730, and VIN code M are important reference points. Professional fitment verification is recommended when the original engine information is uncertain.