Oil Filter Nut Tool

Description

Oil Filter Nut Tool | Honda CB175 / CB200 / CB350 / CB360 / CB450

The Honda CB175, CB200, CB350, CB360, CB450, and CB500T family of motorcycles use a centrifugal oil filter rather than a paper filter element. Oil gets pumped into the spinning rotor, which forces dirt particles against the inside of the rotor cup while clean oil is pumped back through the engine. Inside the filter housing sits a special four-pronged retention nut that secures the rotor to the crankshaft. This nut cannot be removed with a standard socket or wrench — it requires this dedicated tool that engages the four notches on the nut.

Why You Need This Tool

You do not need this tool for routine oil filter cleaning. That service only requires removing the access cover and scraping out the debris — the retention nut stays in place. You need this tool when doing deeper engine work such as servicing the oil pump or performing a full engine rebuild. The oil filter architecture across the entire CB175 / CB200 / CB350 / CB360 / CB450 / CB500T family is the same, which means they all have the same special nut. It uses a standard 3/8-inch drive ratchet and extension to reach inside the filter cup.

This tool also works on the clutch assembly on many Hondas from the 1970s, including the CB750.

Specifications

Note for CB360 owners: On the CB360, there is no separate oil filter access cover — the entire right-side engine cover must come off to access the filter.

Installation

Clean out the filter housing before attempting to remove the nut so you can see the nut and lock tab washer clearly. Use a screwdriver to bend the lock tab washer tabs out of the way from the nut. Wedge a penny between the crank drive gear and the clutch gear to hold the engine in place while you remove the nut. Take note of which side was facing down for proper reassembly.

Torque spec: The retention nut must be torqued to 33–39 ft/lbs with a torque wrench on reassembly.