This happened to me recently with my 500 Cad. Drove home, no problem. Parked up, then 15 minutes later went to get my kids - no pressure. New pump, all happy. No visual issues with old pump, no knocking before or after, yet pump died seemingly instantly. So, my experience says you should be good with new pump. Cosmo P.S. Primed with vaseline, I did.
someone told me that my oil pump bypass check valve might be stuck. I did pull the cap concealing it and all I saw was a spring. It look like a pin hole in it at the inside of the pump. Does this make sense to anyone and could it cause total loss of oil pressure?
Thanks, bought a new Melling High Volume pump and going to install today. Keeping my fingers crossed!!
check the filter, they do collapse inside. had it happened to me many times when i worked at an old chrysler-plymouth dealership.
The poppet should be in there too. It sort of looks like a bullet. If there is only a spring there is a pc. missing. JC
Ureka!!! We have oil, filled filter half way and pour some in the pump as well. I didn't put the pan on just held a tub of oil up to the pick up. Drill motor with priming tool in reverse and it came gushing out of the sending unit hole. YEAH!!! Ok now new issues, bought two items from 440 source, new dip stick and windage tray. The dip stick end that fits into the block seems to be to big for the hole, anyone else come across that, should I just file it down? Also I have installed the pickup and had thought that the pickup would slide over it some how, oops. Doesn't seem to, is this something that can be installed with the motor still in the car?
Found the problem in the old pump. There was a small piece of what looks like aluminum in the oil pump bypass valve. The motor has aluminum heads and intake, but I can't figure out how it got passed the pickup tube or what it might be. Put a magnet to it, it is non-ferrous. Any thoughts? Should I pulled the main bearing caps before I put the pan back on?
Are the heads from 440 source on most appilications you have to hog out the exhaust pushrod hole if the cam has a good lift. After doing this with a die grinder the heads are a pain to clean up.
Not sure, they came with the car. They are Edlebrock RPM heads, I just can't figure out how some got past the pick up as the piece of metal is large the the pick up screen grid. The car was sitting for a while before I bought it, do you think that it may have come in the backway, reverse of oil flow direction when the oil was changed?
I've had a rocker arm break and the oil pressure went immediately to zero. It wouldn't hurt to remove the intake manifold and check if there's a lifter out of its bore.
I have the pan off and can see the lifters in place from below and have also had the rocker covers off and all pushrods are in place. What would a piece of bearing look like, one side of the piece that was in the pump was is very shiney.
Ok so got the oil pump, windage tray and oil pick up installed and Eureka we have oil pressure. Woo Hoo and it actually started. Lifters clacked a little for about a minute but went away shortly. Lesson learned for me is that I should have taken apart the oil pump and examined it more closely. That would have saved me a lot of time and money. On the positive side I have learned a lot about this car inside and out in the short time I have owned it. As I noted previously it appears that it was a small piece of aluminum stuck in the oil pump by pass valve. I hope that helps someone else and THANK YOU all for your help with this.
The Jalopy Journal
