o;i pump

Just got my 466 apart.Bearings look as good as the day I put them in,two years ago.The oil pressure was bouncing a little,maybe 10psi at the race.Could it be my oil pump(m84d) going bad?What pump do you guys run? I never had a issue before. Thanks

What Pump? What Pan? How much oil? What Filter? What Did you change if everything was consistant for so long?

The pan is a milodon 30570 rear sump,mellings M84 D pump,6 years old.Oil filter NAPA 51515R,I've ran them for 6 years also.9 quarts Brad Penn 20w50 oil. Also a Canton windage tray,and pickup.

Everytime I've had one to start bouncing oil pressure like that, it's always been a crack in the pick up tube or a hair line crack around the base of the pump.

466bronco wrote:Just got my 466 apart.Bearings look as good as the day I put them in,two years ago.The oil pressure was bouncing a little,maybe 10psi at the race.Could it be my oil pump(m84d) going bad?What pump do you guys run? I never had a issue before. Thanks

That's a decent oil filter you are using. Still, try changing the filter first and see if the bouncing needle remains or disappears. It wouldn't be the first time a filter caused that symptom.

Paul

WoW,could be a number of things. I would try what Dan and Paul said first. If it's not there could be bigger problems.I had a block develop a hairline crack in the block in #2 main webbing from the main cap to the cam. Did'nt find it until I cleaned the webbing w/brake cleaner and it showed its ugly head.Hope it don't come to that.

You might want to also look at the pressure regulator valve and spring in your pump as you analyze the deal.
The other posters gave great insight.
I just experienced a problem with my 514 that was in storage for about 4 years. On the dyno, the pressure was inconsistent and a few pounds lower than I remembered. I installed the engine and after 5 passes, yanked it back out this week because the oil pressure was inconsistent from run to run. I found the pressure regulator spool valve in my M84BHV was stuck in a partially open/closed position. It looks like condensation in the oil allowed a rusty area to develop in one of the grooves in the valve. I just polished the valve spool and bore, put all back together and all is back to normal.
As others mentioned, the long pickup tube on the 84D should be suspect too.
Goog luck!
Keith

Last one I worked on with suspect oil problems turned out to be a cracked pump at the base. Found it when we were tweaking another pickup tube for clearance.

i realy like the kaase pump i got from Lem.

cool40 wrote:i realy like the kaase pump i got from Lem.

Yea me too. If that baby breaks,you have some real problems somewhere.

Haven't found a problem with any parts.May be the pressure regulator,going to put new pump in it.Looking at Kaases pump.Thanks for all the feedback.

466bronco wrote:Haven't found a problem with any parts.May be the pressure regulator,going to put new pump in it.Looking at Kaases pump.Thanks for all the feedback.

the kaase pump is a little high but real good insurance.like i said,i realy like mine and already have one for my new motor.

First 1/4 mile pass (track) that I ever made w/a 385, I was on the return road and valvetrain got mighty clickety... oil pressure was hooked up to the stock '85 Mustang gauge so it read really slow... Anyway trickled down to zero.. pulled the sender & had spurting oil... turned out after pulling the motor that the plug that was pressed in behind the pressure reg spring on the pump began to give up, and was only still partially there due to the rear sump pickup flange catching it..

Checked the bearings.. Looked good.. Fixed pump.. Ran it.. Stock 429 triumphant