1988 Isuzu Trooper diesel conversion

Finding an oil filter for the 4JB1-T engine was a bit of a hassle. Apparently, older versions of this engine used a filter identical to the one used on the Isuzu C223T, the diesel available in the Trooper in the USA. My engine, however, required a different filter with rather strange specifications. The center hole is 26mm wide, making it difficult to match.

I found a page which listed a few different part numbers (go to the 'workshop' link and select 'part numbers') but none of them crossed over to any North American manufacturers. A 4x4wire member then found this page, which again lists a few different options plus an OEM number. Here is the 4x4wire thread discussing this.

I called my nearest Isuzu industrial dealer and was able to order filters based on this number. Apparently, no other Isuzu filters in the USA will fit, and there are no known aftermarket crossover parts available, so this is the only filter that will work (save for parts ordered from overseas).

As an aside, it is not a dual-stage filter like the one I removed from the engine. This means I will need to change it more often than the dual-stage interval of 7500 miles, but that's fine with me. The only other problem is that they cost $20 each!