Generation III Internal Engine - Oil pressure droping




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sickSS
12-13-2008, 12:59 PM
I've got a 02 SS I bought with most of the mods already done it's got a forged 347 from tsp w 5.3 heads and it's got a ported LS6 oil pump. When I start the car it holds about 60 psi and it slowly drops and after about 15 mins its down to 0 psi. I figure it's pumping all the oil out of the pan and the oil's not making it back to the pan. Anyone ever seen this problem before?

Thanks
Luke


heavymetals
12-13-2008, 02:01 PM
How many quarts did you put in it?

If it was at least four, you would have oil all over the place if it wasn't making it back to the pan.

Sounds like your oil pump install is bad (o ring).

It is a common error/problem.

01350ss
12-13-2008, 02:05 PM
how much oil and what thickness. bad o-ring would bleed pressure from the beginning I would think. To me it sounds like wrong oil or a bad pump. As the oil warms and thins, the pressure drops.
What oil is in the car and how much?


the_merv
12-13-2008, 02:41 PM
Dont drive it until you figure it out.

sickSS
12-13-2008, 02:56 PM
10w40 mobil 1 5quarts

sickSS
12-13-2008, 05:47 PM
i did run some mobil 1 15w50 for a while a friend talked me into that

OUTLAWZ RACING
12-13-2008, 06:18 PM
Hows the sending unit have u replace that? Oh dose it start to tick or knock when the oil pressure goes down?

sickSS
12-13-2008, 08:00 PM
I haven't replaced the sending unit, it does start to knock a little when the oil pres gets to 0psi.

OUTLAWZ RACING
12-13-2008, 09:05 PM
I haven't replaced the sending unit, it does start to knock a little when the oil pres gets to 0psi.

Ohh... Dam Are you 100% sure there is nothing in the pan or the pickup is loose? What about the cam retainer I know if that is loose you will loose oil pressure. The only other thing is bearings. Oh what about the barbel by pass thing it may have come out.

01ssreda4
12-13-2008, 10:11 PM
if its fine cold then drops off as the motor warms up i would suggest a pressure relief spring. i have had those exact same symptoms on another car i had. replace the pump.

the_merv
12-14-2008, 03:20 AM
I had a Pump fail on me, tore the whole Engine up..:(

itchygomey98
12-14-2008, 09:24 AM
I had a new pump from the dealership crap out after 1500 miles. The relief valve was stuck. I pulled the pump apart and the bottom of the relief valve had a bur around it. What a bunch of crap. Tear the front of the engine down and get a good look at things (cam retainer, pump, pump o ring, and the little freeze plug in the front) If nothing then I'd take the rear cover off and check the barbell out. Good luck with it.

DrkPhx
12-14-2008, 01:23 PM
I agree with everyone else; don't drive or even start it anymore until the problem is fixed. It could be something as simple as the oil pump o-ring or something more serious. Either way, you will have to tear it down for an inspection.

CalSpeedPerformance
12-14-2008, 01:30 PM
Bad o-ring wont have good pressure when cold....

I personally would be swapping to a new oil pump and start back up with 20w50 in it and see what happens. Check for bearing material in the oil when you drain it

WYATT318MOPAR
12-14-2008, 01:34 PM
I vote bearing cam or main. I had a 5.3 do the same thing new pump fixed it for like 1 day right back to the same thing. My repair in the end pull the bastard out and install a 6.0

98Camarod
12-14-2008, 02:00 PM
I haven't replaced the sending unit, it does start to knock a little when the oil pres gets to 0psi.

I'd say its too late. You shouldn't let it run with 0 oil pressure. Thats got spun bearing written all over it. If it's started to knock, its only going to get worse and you have a bottom end knock now. I would have tore the front cover off and replaced the pump when you had the chance. Sounds like you will be doing a rebuild now.

sickSS
12-14-2008, 04:39 PM
it doesnt knock at all when it has anything above 0 psi im gona order a oil pump after christmas and try that. what pump would yall recomend?

98Camarod
12-14-2008, 04:56 PM
I have a melling 295, no problems for me.

01ssreda4
12-14-2008, 05:41 PM
295 here also