CRANKCASES 1941-1947 HARLEY-DAVIDSON KNUCKLEHEAD – REPLACES OEM# 24520-41

Harley Crankcase | The crankcases for a 1941-1947 Harley-Davidson Knucklehead (replacing OEM #24520-41) are essential engine components, specifically the housing that encloses and supports the crankshaft, camshaft, and various other moving parts of the engine. These parts replace the original equipment manufacturer (OEM) crankcases, which might be cracked, damaged, or worn from long use in vintage bikes.

Purpose | Buy Harley Crankcase Online

• Encasing engine components: The crankcase is the main structural support for the engine’s internal parts. It holds the crankshaft, camshaft, oil passages, and other critical components.
• Lubrication system: The crankcase also contains oil passages that direct the flow of oil to various parts of the engine to keep it lubricated.
• Engine stability: By holding the crankshaft and camshaft securely, the crankcase ensures the precise timing and balance needed for smooth engine operation.

Design & Features | Buy Harley Crankcase Online

• Material: Crankcases for vintage Harley-Davidson Knuckleheads are typically made from high-quality aluminum or cast iron, which is durable enough to handle the stress of the engine’s moving parts.
• Correct OEM fitment: Replacement crankcases are designed to replicate the original specifications of the OEM #24520-41 crankcases, ensuring compatibility with the rest of the engine and components.
• Right-side and left-side cases: These crankcases generally come as a matched pair for both the right and left sides of the engine.

Applications:

This crankcase fits the Harley-Davidson Knucklehead models from 1941 to 1947, which includes:

• EL 61 (1000cc, 61 cubic inches)
• FL 74 (1200cc, 74 cubic inches)

The Knucklehead engines from this era are iconic due to their distinct rocker boxes that resemble knuckles, hence the name. These engines are prized among collectors and enthusiasts, making restoration with correct parts essential for preserving the bike’s value and functionality.

Important Considerations:

• Matching numbers: If you’re doing a full restoration and want to keep the bike as original as possible, some enthusiasts prefer to have cases that match the bike’s original serial numbers. However, for functional repairs, a quality aftermarket crankcase that replaces OEM #24520-41 should fit and perform just like the original.
• Engine alignment: When replacing crankcases, precise alignment is critical to ensure that the crankshaft and other moving parts operate smoothly and without excessive wear.
• Compatibility with internals: Ensure that the replacement crankcase is compatible with all other engine internals (like bearings, gears, and shafts) to avoid assembly issues.

Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and precise fitment. Intended to work with stock or identically constructed engine components. Finished and detailed like the original counterparts so these cases will smoothly blend into your old mill to give it a new life. For ease of installation both case halves are carefully matched and feature pre-installed case bushings, which are line bored and lapped for standard rollers. Cam bushings are already in place and reamed. (for exact measures please see below).

The cases feature a smooth, uniform glass bead blasted finish.

All cases feature laser-engraved CB production numbers, which are registered and filed.-fits Knucklehead 1941-1947
-cam shaft bushing ID: 20.7 mm
-cast aluminum, bead blasted
-replaces OEM 24520-41