Motorshop Left Side UL Engine Case for Harley UL 1937-1946

Left side engine case replacement for Harley UL models 1937–1946 featuring a blank number boss and the same oil passage for the outside sprocket shaft bearing as the original case.

Designed to work with the OEM right side case for a precise foundation during rebuild or restoration, this Motorshop case is cast in Taiwan for durability and proper alignment with stock components.

Installation and compatibility

• Requires milling of the cylinder base surfaces and motor mount surfaces for proper fit.
• Cast-in bushing must be installed after pressing in the case race and drilling the required hole in the left case.
• Accepts a standard case race (example: #10-0208 Sprocket Left Side Case Race) for compatibility and ease of installation.
• Made to pair with stock parts and maintain the structural integrity and performance of the vintage Harley UL engine.
• Fitment includes Harley Davidson UL years: 1937–1946, plus 1947 and 1948.
• Made in Taiwan.

Complete your restoration with this left side case to support a reliable rebuild of your vintage Harley UL engine.

Side valve replacement left side engine case features a blank number boss. This case has the same oil passage for the outside sprocket shaft bearing as the original case.

Upgrade your Harley Davidson UL engine with the Motorshop Left Side UL Engine Case, designed specifically for models from 1937 to 1946. Crafted in Taiwan, this replacement left side case ensures a precise fit when paired with the existing OEM right side case, providing a reliable foundation for your engine rebuild or restoration. The installation process requires milling of the cylinder base surfaces and motor mount surfaces to ensure proper alignment. Note that a hole must be drilled in the left case to accommodate the cast-in bushing after pressing in the case race. The left side case accepts a standard case race, such as the suggested #10-0208 Sprocket Left Side Case Race, ensuring compatibility and ease of installation. This component is essential for maintaining the structural integrity and performance of your vintage Harley engine, whether you're restoring or repairing your motorcycle.
The case is designed with durability and precision in mind, allowing for proper alignment and fitment with other engine components. It includes necessary features to facilitate installation, such as provisions for mounting and compatibility with stock parts. The technical notes recommend using the specified sprocket race for optimal fitment, ensuring smooth operation and longevity of your engine assembly. This product is a critical replacement part for enthusiasts aiming to keep their vintage Harley Davidson UL engines in top condition.
Complete your engine rebuild with confidence by choosing this high-quality left side case, and consider the accessory items included, such as the engine case pinion bearing kit, knucklehead custom engine assembly, primary chain oiler tube, and the cadmium motor case bolt kit, to ensure a comprehensive restoration process.

Features:

• Designed for Harley Davidson UL models from 1937-1946

• Requires milling of cylinder base and motor mount surfaces for proper fit

• Cast-in bushing must be installed after case race pressing and drilling

• Accepts standard case race, compatible with #10-0208 Sprocket Left Side Case Race

• Made in Taiwan with durable construction

Fitment:
Harley Davidson UL 1937
Harley Davidson UL 1938
Harley Davidson UL 1939
Harley Davidson UL 1940
Harley Davidson UL 1941
Harley Davidson UL 1942
Harley Davidson UL 1943
Harley Davidson UL 1944
Harley Davidson UL 1945
Harley Davidson UL 1946
Harley Davidson UL 1947
Harley Davidson UL 1948