Drain Plug and Oil Line Fitting for Big Twin 1937

Oil line kit by Strange Bird; for Horseshoe oil tank / models without external oil filter; fits Big Twin OHV 1937; replaces OEM HD 3571-36, 3571-36A, and 3572-36; USA; gross weight: 369 g

Oil line kit by Strange Bird; for Horseshoe oil tank; steel, CAD (zinc nickel galvanized); replaces OEM HD 63510-37, 63511-38, and 63570-37; USA; gross weight: 348 g

Oil tank; fits Knucklehead, Big Twin Flatheads 1937; sheet steel, black; drain plug: 3/4”-20 UNF; filler spout: 1-1/4”-20; replaces OEM HD 3503-36; gross weight: 3.34 kg

Banjo bolt; for feed & return oil line; fits Big Twin 1936-1937; steel, CAD (zinc nickel galvanized); thread: 1/2”-20; replaces OEM HD 3570-36A; gross weight: 28 g

Seal washer by James Gaskets; for Fuel valve; fits Big Twin 1940-1965, 45” 1940-1952, Servi-Car 1940-1958; brass; position: bottom; ID x OD: 25/32 x 1”; replaces OEM HD 62085-40; gross weight: 2 g

Oil change without a mess! This rubberized aluminum alloy sheet allows you to form an individual funnel or trough to direct your waste oil from the hard-to-reach oil tank drain hole or oil filter plate to any suitable container. Of course, you can also use it to fill fresh oil into your tank. Tapered at one end so it can be shaped to reach tight spots. You can reshape and use it a thousand times and on different bikes. With suspension eye so you can hang it up for drip-off. Easy to clean.

Pre-TwinCam engines have a spring loaded ball check valve to prevent the engine oil from seeping down to the crankcase. These check valves don’t last forever. If you try to start your engine after a lengthy period of inactivity (e.g. winter), the oil in the crank case gets forcefully ejected via the breather. Creating an ungodly mess on your garage floor....