Unfortunately I just couldn't break the seal holding it in place and my options were a bit limited.
That's what I love about having a CNC machine. In this situation I would have been left with no choice but to resort to butchery or worse still buy the tool for removing the filter.
It occured to me that I could try and make one. I know they aren't that expensive but why not make one. After all I'm changing the oil myself so I might as well save a few extra dollars if I can. Drawing it is not particularly dificult and as it turned out it only took 5 minutes to do. For the prototype I'm using some 12mm MDF which I have laying about the workshop.
Because the shape has 15 flats on it I had dificulty measuring it properly so decided to cut the hole out first and could then test the new filter in the hole before proceeding with the final cutout. Just as well I did because I needed to enlargen the hole by 0.5mm to get a good fit. This is simply achieved by creating 2 profiles using the same tool but give the tool a different number between profiles. this will force the machine to stop at which time you can test the filter in the hole and if it fits then hit cycle start and the machine will continue with the cut. If it doesn't fit then hit the cycle stop, load a new file and recut.
Well there is no doubt about it, the tool worked, even if it had to be shortened a bit. I have redrawn it and created a second tool for the smaller oil filter on Mrs CNCnutz car, just in case she needs it to change the filter.
After using it it looks like MDF is more than strong enough for the job unless the hulk does the next oil change and tightens the filter to excess. I can always cut one from plastic like HDPE if I need to.
The files are available for download for anyone who wants them.
Toyota surf 1998 http://bit.ly/2On6Rpb
Toyota Corolla 1996 http://bit.ly/2PxvI6h