Ford CL 45 Question

I have a Ford CL45 with the Shribara (sp?) 4 cyl. desiel engine. I am having over heating problems with it. I recently replaced the waterpump and put is all back together and now another problem has me stumped. I ran the skid for about 30-45 minutes moving some dirt and the temp went up to ~210 degrees. I seemed to be staying there and then I noticed the oil pressure was very near zero. I shut it down. The next day, I checked the oil (good level) and figured I would give it another shot. I kept a close eye on the oil pressure gauge. The oil pressure stayed ~70 until the skid was again upto ~210 degrees. It all of a sudden dropped from 70 to zero. I shut it down again. Anyone have any ideas on what may be causing the oil pressure drop? Also anyone have an idea what the skid should "normally" run for a operating temperature? Thanks, Stoney

210 is warmer then I like to see, but not at the critical level yet unless your running straight water for coolant, which boils at 212. 180 is a better temp but if you are in a hot climate may be difficult to maintain.
Regardless of the 210 water temp you should not loose more then a few psi oil pressure as the engine warms up, and lose it gradually as temp increases , not all at once. Sounds like the engine oil pump or relief may be defective.
I would also be conecting extra guages to verify theothers are reading corectly.
Ken