My 853 manual had all the engine rebuild info in it too, but I sold it with the loader.I assume you have tried contacting your local Isuzu dealer? they should have service information on hand or know where to get it.
It's frustrating that the only way to get the specs for this is to shell out 103.00 for a manual. I have been looking around for someone else with one and will scan it like I did my other manuals (610, 700, 720) for easy reference. I was told by a friend that the same engine was used in isuzu troopers and some generators.My 853 manual had all the engine rebuild info in it too, but I sold it with the loader.
Ken