Re: Oil Pressure Help
I had the same problem (no oil pressure reading) on my diesel Scout II. What mine did (actually, still does) is read nothing when the engine's running at warm idle. When I throttle up, the gauge reading goes up to halfway. The gauge also reads when the engine's idling while cold (before the oil starts flowing real well). I pulled my valve cover and started the engine, and, even warm, I could see my oil flowing. There wasn't much that was plainly visible (which seems normal to me; you usually don't have oil going up in spurts), but it was clear that everything was getting lubed, at a point that's further away from the oil pump than anything else that was visible. So, it was clear to me that I had oil pressure, and that the gauge was lying to me.
There are two common things that'll create this reading. One is the sending unit. You can test this with an ohm meter; I don't know the values right off but if the reading is VERY high or completely off the scale, the sending unit's bad. Foir instance, my bad sending unit reads about 200,000 ohms, and I think the value's supposed to be in single or double digits.
The other is the constant voltage regulator. This little gem [img]/wwwthreads_images/icons/tongue.gif[/img] controls output to the oil pressure gauge, as well as the coolant temerpature gauge and the fuel gauge. If one, the other, or both of those are messed up, your CVR could be messed up. I don't know how to test it, but I've heard that a solid-state regulator's available, and would be a good upgrade no matter what (even if the old mechanical CVR's good). I don't know wher eyou can get them; wish I did. You can try an International dealer.
Hoep that helps some! Good luck! You got a good truck (even though it's a gasburner [img]/wwwthreads_images/icons/smile.gif[/img])
1980 International-Harvester Scout II SD-33T