Everything about Oil-filter Wrench totally explained
An
oil-filter wrench is a tool for removing spin-on type
oil filters. These filters are smooth, cylindrical canisters with
knurling on the bottom that are difficult to grip, especially when they're oily.
One common type of wrench is shown on the right. The loop of chain is placed around the filter, and the bar is turned anticlockwise by hand until the chain wraps itself tightly around the filter. A
socket wrench or
adjustable spanner is then used to turn the hexagonal bar further in the same direction. This increases the tension in the chain, which bites into the soft metal casing of the oil filter and prevents slippage.
Another type uses a metal band that's attached at both ends to a handle. The looped band is placed around the filter and the handle is turned anticlockwise, which puts tension on the band, causing it to grip the filter.
A third common type of wrench utilizes a metal or plastic cup that's shaped much like a socket. The cup is placed on the end of the filter, which engages the knurling. A socket wrench is then used to loosen the filter.
VAG and
BMW cars require this type of wrench to remove their filters (or the lid of the filter housing, where a non-cartridge filter is used).
Finally, a "claw" type of wrench, manufactured by
Sykes-Pickavant and others, has three geared metal prongs and accommodates a (typically) 3/8" ratchet driver. As the driver is turned anti-clockwise the gears make the prongs clench the filter body harder. This type is very effective on tight filters and can be used in more confined spaces than a strap or chain type.
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