Hi all, I recently did a valve job on my Dodge D100 w/ a 440 big block. After getting everything working well we took it out for a test drive. All the gauges were showing proper temp, oil pressure and rpm's. Today I drove it to work and back. On my way back, I noticed the oil pressure gauge was up as far as it would go (well over 100). When I got home I turned the truck off and let it sit. I went back out and turned the ignition on but did not crank the engine and the gauge read about 20. I have been told the gauge is stuck, but I just wanted to get a seccond opinion. I also was wondering if anyone knew the location of the oil pressure sending unit.~Ace.
Update: I checked the oil level and the coolant, all was well. I turned the ignition on an the same thing happened, the oil presure gauge had a reading of about 20. I turned the truck on, went around the block ad it had pegged the gauge again. I parked it, turned it off, checked the oil, then turned it on and drve around the block once more and the oil press. gauge had a low reading. When I got back, I checked the oil level and it was still the same. Does this inconsistent reading point to an error in the sending unit?
Probably the sending unit, and easy enough to replace. It would be a good idea to do a manual oil pressure test since you will have the sending unit out. This is done with a mechanical gauge which you can buy, or borrow if you know someone that has one. Pesonally I run a mechanical gauge because they are much more accurate.
Hey, Thanks so much for the help. I ordered a sending unit today. I'm having trouble locating the sending unit on the block; Would you be able to tell me where exactly to look?Thanks again,~Ace.
I'll do you one better, pics!Sending unit will be in the rear of the engine, on top, right next to the firewall.. I'll show you 2 pics.. 1 on a motor in my garage, and the other on the 440 in my Charger..
Wow, Thanks so much for your time! The pictures were a great help... I never would have found it on my own. I was looking for it in the same places they're located on a chevy.
O.K, I replaced the sending unit but the gauge is still reading high pressure, its less sporadic now but still not in the normal range. I'm begining to think it may actualy have high oil pressure. Before I take any steps to fix that, I'd like to put a mechanical gauge in the truck just to be 100% sure. I have been looking online for a guage and pickup for that but I can't find one made for the 440. Can any of you point one out for me?Thanks.
Any local auto parts stroe would have the three guage set up that you need...Has adapters in there for every enigne out there...None are gonna be 440 specific...I wouldn't put to much focus on that stock electric guage...Install the aftermarket mechanical guage and then you'll know...
"You know somethin' Pepper, You can't polish a turd" Will Darnell, Christine...