No oil pressure?

[Civib2]

okay i was driving the car hard at 18psi, when i slow down it starts rod knocking so i immediatly go to my house not far at all and pull the pan off all looks good replaced the rod bearings just for the sake of it possibly being them. But when i was done I realized i have no oil pressure. the way i checked is by the feed line into the turbo. it has a brand new high volume oil pump in it that comes with the bottom end rebuild from howell. pleaes tell me it could be something else other than that pump for me to check cause i really dont feel like replacing that. Also has anyone had problems with these pumps before.

 

[VelocitàPaola]

I have that same pump, and I wasn't getting any oil pressure after my rebuild. Keep in mind that this is with a fully dry, unprimed system, but still... I checked the oil pick up tube, and packed the pump with grease, and after cranking her over about a million times, I still wasn't getting any oil. Finally, I decided to just do what Brian calls the "holy Mary." I started her up, and sure enough, oil came right out of the turbo feed line. I suspect that the RPMs the starter provides just isn't enough to get cold oil circulating with these pumps. On the other hand, I know of other people who got oil after only cranking the engine over a few times...

 

[boostedinaz]

Not sure how the 420A is different from the 4G but I had the same problem.

I tried cranking it and even giving it the "holy mary" and no dice. I got scared and turned it off after it hand't built pressure over a short time. I ended up having to pull all the timing stuff and priming the pump with an impact for about a minute.

I would also make sure that you clearances are correct. If it was knocking it may have beaten a rod end or the crank and made the clearances enough for it to be hard to build presure. Also make sure that the pickup is on well and not sucking air.

 

[dr1665]

Check to make sure you don't have any sludge or crap blocking the screen on the bottom of the pickup tube? Could there be a problem with your feed line? Collapsed behind the engine, perhaps? Any leaks, now that it's sat for a bit?

Consider yourself lucky that you're not getting any oil pressure. Last time I heard what I thought was rod knock, it was actually a wrist pin lock failure on a Wiseco piston. The wrist pin was floating out the one side and the actual piston was flopping around in the cylinder. My car went down for seven months after that. Never again.

Oh yeah, and, you got no business doing 145 on the highway and you know it. Stop driving like an asshat, okay? Keep it on the track.

^^^ That's a friendly reprimand. Be cool and slow down. We need all the smart tuners behind the wheel, not in the back of a hearse.

 

[Defiant]

okay i was driving the car hard at 18psi going fast about 145mph on the highway

That's all we had to hear. We don't care what happened to you, or your car.

 

[Blitzeclips]

Yea man if you do that, don't tell us about it. I don't even do that stuff anymore after I've put my turbo on. I drive like a granny. No joke. I won't even get on it unless NO ONE is around or on the road. Even then, I never break 80 or 90...

You actually may want to check your gauge. That may the your problem. Although, it would be the first thing to check, it could be the easiest to neglect...

Hmm, other then what's already been said, I can't see why you wouldn't have oil pressure... If you heard rod knock, let's hope you haven't damaged anything more.. I would honestly check the oil pressure sending unit as well. It has a plug, then when you remove the plastic housing, theres almost a lexan type window with oil trapped inside. If you pull this off and check it, you may find it's faulty...

To tell you the truth, if it's still an OEM sending unit that is well over 10 years old, you may want to consider replacing it. I actually bought a brand new one just to be on the safe side with my install... Car started right up, and I've had no problems.. YET... (knocks on wood) ..


Let us know what checks out or looks funny to you. Maybe we can go from there...

 

[VelocitàPaola]

You actually may want to check your gauge...

He said he wasn't getting any oil pressure at the feed line. Whether or not the gauge, or the sending unit is in working order is irrelevant.

If it was knocking it may have beaten a rod end or the crank and made the clearances enough for it to be hard to build presure.

Correct me if I'm wrong, but I thought only a spun main bearing would affect oil pressure. Aren't the rods lubricated by a "splashing" effect, while the mains have oil physically pumped in, from the oil pump, through the drilled oil passages? That was my understanding of it, at least. I'm too far away from a spare 420A crank to confirm my thoughts now.

 

[Civib2]

yeah I know the screen is not clogged i just had it out yesterday. I still have my old pump from the stock motor would it handle the power output now? and is there any other things i could test to make sure its the pump cause you all know its not fun to do. Also how do you prime it or pack it as you are talking about. i would love to get this one working properly.

 

[Talon ESI-T]

No Paul the rod bearings should have pressure on them. Its not a splashing effect. Spun rod bearing or worn bearing will affect oil pressure. Now the wrist pin is splash effect, thats why it is a bronze bushing.

I would very the oil feed line is not kinked. If you started it and it didnt spew oil then you could have an issue. Do you still have the OEM oil sender hooked up? Any oil light? Any Oil Pressure gauge?

I had a mechanical oil pressure gauge go to "0" on me once but no oil light so i took it straight home. Sure enough something clogged the oriface in the gauge. This is why i believe in leaving the factory sending unit connected. Its just another indicator of oil pressure.

If you dont have an oil pressure gauge then get one now. You have a great deal invested in the motor, why fly blind?

Terry

 

[Civib2]

Okay well i know im having oil pressure to the filter so i know the pump works. So my next thought was that maybe i spun one of the main bearings so i pulled the cradle off but i dont really see anything spun or burned out. So im back clueless again what else could it be to cause no oil pressure?

 

[Civib2]

comon on guys no one. what else could it be if the bearings are all okay im thinking hte only thing left is the galleries could be clogged or something.

 

[VelocitàPaola]

Did you "holy Mary" it, like I suggested? Put some assembly lube on everything before you re-assemble the bedplate and rods, then start her up... You'll probably get oil by then. If not, the two or three seconds you're going to let the car run won't damage anything.

I doubt the oil galleys are clogged.

By the way, no bumping...

 

[Civib2]

yeah i think thats what is going to be next a holy mary start. yeah cause i agree i dont think the galleries would be clogged or enough that would cause no oil pressure. Im going to relube everything throw it together and give it a go. Any other thoughts would be great though.