Engine disassembly and diagnostic: 1962 Mopar Slant Six | Redline Rebuild Update

How to Fix a Leaky Oil Pan on a Slant Six Engine

Introduction to the Project

• David introduces the project focused on fixing a leaky oil pan for a Slant Six engine, noting its current poor condition.

• The goal is to increase horsepower beyond factory specifications by replacing the aluminum block with a cast iron block featuring a forged crankshaft.

Engine Disassembly and Observations

• David explains that while waiting for the new engine, he will disassemble the existing one to understand structural differences between aluminum and cast iron blocks.

• Initial inspection reveals excessive RTV sealant used on the valve cover, indicating potential past issues with sealing.

Condition of Engine Components

• The rocker arms are noted as adjustable but have an unusual design; solid lifters are also present, which allows for adjustments rather than relying on wear.

• David plans to remove the rocker arm shaft assembly and cylinder head next, aiming to delve deeper into the engine's internal components.

Insights on Cylinder Design

• Upon removing the cylinder head, David observes that cylinder liners are made of ductile iron but are poorly supported within the aluminum structure.

• He discusses thermal expansion differences between steel and aluminum, which could lead to sealing issues due to movement during operation.

Analysis of Gasket and Block Condition

• A copper head gasket is identified; however, there are visible flaws in sealing surfaces that may contribute to power loss when increasing combustion pressure.

Engine Disassembly and Donor Vehicle Selection

Oil Pan Removal and Initial Steps

• The speaker begins by discussing the need to remove the oil pan to access the timing chain and balancer, indicating that they will let the oil drain first.

Donor Vehicle Acquisition

• A call from a local wrecking yard reveals options for a cast iron block with a forged crankshaft, prompting a visit to inspect potential donor vehicles.

Choosing the 1974 Dodge Dart

• The 1974 Dodge Dart is selected as the donor vehicle due to its pre-76 block characteristics, which include a specific rib behind the water pump indicating it has a forged crankshaft.

Detailing Progress on Project Car

• The project car returns from detailing, showcasing improvements. A YouTube channel called Detail Dane is mentioned for viewers interested in the cleaning process.

Historical Insights on Vehicle Modifications

• Observations reveal that the project car was originally silver but repainted gold. The speaker notes remnants of blue paint on the engine, hinting at its history and previous modifications.

Project Goals: Upgrades and Structural Integrity

Suspension and Brake System Enhancements

• Discussion shifts towards necessary upgrades for suspension and brakes; plans include replacing an inadequate single master cylinder with disc brakes for improved performance.

Addressing Structural Concerns

• The team identifies structural issues needing attention, particularly concerning fiberglass patches that may have been overdone in past repairs.

Rear Axle Considerations

• There’s concern about whether an existing 7.25 axle can handle increased power; discussions revolve around upgrading to an 8.75 or 9-inch axle for better durability.

Continuing Engine Disassembly

Returning from Wrecking Yard Trip

• After returning from inspecting potential engines, focus returns to disassembling the aluminum block while comparing it with cast iron components throughout this process.

Unique Features of Aluminum Block

• Notable differences between aluminum and cast iron blocks are highlighted during disassembly; observations include unique features like non-standard oil drain plugs designed ingeniously with magnets.

Condition of Components

How to Properly Inspect Engine Components

Initial Observations and Issues

• The engine shows signs of neglect, particularly with sludge buildup. The speaker plans to clean the front side before addressing the crankshaft, pistons, and rods.

• Notably, this is the first water pump encountered with sand inside it, indicating potential contamination issues. There are concerns about a stripped bolt on the H chain.

Timing Marks and Alignment

• The speaker emphasizes the importance of verifying timing marks between the crankshaft and cam gear for accurate alignment.

• Aligning these marks ensures that the engine is at top dead center (TDC), which is crucial for proper timing setup.

Compression Considerations

• The speaker notes that cylinders one and six will be at the same stroke during inspection. He mentions significant depth of pistons in their holes, affecting compression ratios.

• To increase compression, decking the surface would reduce air area above pistons; however, machining challenges arise due to material differences (aluminum vs. cast iron).

Disassembly Process

• Before removing pistons and rods, it's essential to label caps corresponding to piston numbers to ensure correct reassembly.

• Upon inspecting bearing surfaces after cap removal, signs indicate overheating but no major damage to the crankshaft itself.

Condition Assessment

• The condition of rod bearings appears concerning with dark coloration suggesting heat exposure; however, no severe wear is detected on other components.

• Main caps show normal wear patterns despite some dirt accumulation; overall assessment indicates satisfactory condition without significant gouging or damage.

Retention Features in Main Caps

Engine Tear Down and Comparison: Cast Iron vs. Aluminum Blocks

Initial Assessment of the Engine Block

• The team is preparing to clean the iron block slant 6 engine using a parts washer to remove grime for better inspection.

• The tear down process for both aluminum and cast iron blocks is similar; however, challenges arise due to lack of tools like a balancer or bolt.

Tear Down Process Insights

• The tear down has been standard, with some carbon buildup noted on the pistons that may require cleaning.

• All head studs were removed for replacement, providing leverage during disassembly; a leaking valve cover contributed to grease accumulation.

Understanding Engine Timing Issues

• Discussion on camshaft and crankshaft timing reveals potential performance issues caused by a loose chain that could skip teeth, leading to misalignment.

• Misalignment can cause valves to open at incorrect times, risking collision with pistons and resulting in poor engine performance.

Challenges with Piston Removal

• A significant ridge under carbon buildup prevents easy piston removal; a ridge reamer will be needed before taking the pistons out.

• Differences between aluminum and cast iron blocks are highlighted; diecast aluminum construction lacks support compared to closed deck design in cast iron blocks.

Material Properties and Structural Differences

• The manufacturing process of diecast aluminum involves injecting molten metal around pre-set components, which leads to structural weaknesses.

• Cast iron blocks provide superior support due to their closed deck design, preventing cylinder movement during operation.

Cylinder Head Comparisons

• Both cylinder heads appear identical despite material differences; further insights into their functional distinctions are requested from knowledgeable viewers.