Author	[Modern View]
fairchm 01-14-2013 13:26:53 75.148.81.187 Report to Moderator	I have about 10 hours on my 930 c/k after a complete engine rebuild. All has been fine until I recently noticed that my oil pressure has started fluctuating. Runs about 40psi, then drops to 20 and appears to randomly swing back and forth. I do have some additional potentially useful information. It has recently dropped below freezing for the first time since I owned the tractor. The oil appears to be clean and free of water. I"ve changed the oil and filter once since the rebuild (15W-40). A new oil pump was not available during the rebuild, so I selected a lightly used unit. Cleaned it , checked clearances. Never seen like before. Any one have ideas? [Reply]   [No Email]
DKase 01-14-2013 20:56:02 75.102.180.184 Report to Moderator	Re: Case 930 Oil Pressure in reply to fairchm, 01-14-2013 13:26:53   I have a 54 DC that does that when it is 1 qt low on oil. There must be a leak in the suction line to the oil pump. Possibility if the gauge checks out OK.   [Reply]  [No Email]
casecollectorsc 01-14-2013 13:44:07 75.102.174.134 Report to Moderator	Re: Case 930 Oil Pressure in reply to fairchm, 01-14-2013 13:26:53   Are the bearings the same clearance as the crankshaft is ground to? In otherwards a crank ground .020 under needs bearings to correspond. I overhauled a 403 IH combine engine one time and ordered the bearings and put engine together and back on combine and when engine was warm 10# pressure. Take it off and back apart. They had given me std. bearings on a .020 shaft. I learned to check after that.   [Reply]  [No Email]
jon f mn 01-14-2013 13:35:06 209.253.26.139 Report to Moderator	Re: Case 930 Oil Pressure in reply to fairchm, 01-14-2013 13:26:53   Did you check your gage?   [Reply]  [No Email]
fairchm 01-31-2013 09:23:36 75.148.81.187 Report to Moderator	Re: Case 930 Oil Pressure in reply to jon f mn, 01-14-2013 13:35:06   Thanks everyone for the tips. I purchased an extra gauge and need to hook it up. I'd dismissed the gauge as a possibility as I didn't think a bad gauge could cause such odd behavior. In regards to bearing clearances, I didn't make it clear but the pressure was rock solid at 40 psi for the first 10 hours then suddenly started acting up. Oil pump sucking air is an interesting idea. I don't remember any O-rings or other sealing devices on the oil pump inlet. Need to look at the manual again. Thanks again   [Reply]  [No Email]
fairchm 02-01-2013 13:51:15 75.148.81.187 Report to Moderator	Re: Case 930 Oil Pressure in reply to fairchm, 01-31-2013 09:23:36   Verified today that the problem is not the oil gauge.   [Reply]  [No Email]