It appears you are absolutely correct. The free online manual for the 1991
Accord at www.autozone.com states at step 4 of the procedure for removing
the oil cooler: "Remove the oil cooler center bolt; this is the fitting onto
which the oil filter is installed." The procedure has a drawing and some
cautions as well.

For the full procedure, go to the site above. On the left, click on "Repair
Info," then "Vehicle Repair Guides." Click on car year, make, and model,
etc. Go to "Engine & Engine Overhaul," "Engine Mechanical," "Oil Cooler."


"lswpubrw" <lswpubrw@optonline.net> wrote
> I'm having an oil drip problem on our 1991 Accord EX. I searched the
> archives and found a few references to what I believe is the source,
> namely the oil cooler that the oil filter screws on to. It looks like
> an simple job but I'd like some guidance on removing the cooler. It
> appears to me the threaded shaft the filter screws onto also holds the
> oil cooler against the block. Is that correct? If I remove the shaft
> can I replace the O-ring on the cooler?