back in black

iTrader: (6)

i have searched and researched for 3months now. i have rebuilt my engine, replaced all bearings still same problem.

ok, this is on a lq9 ls engine.

all the bearings are brand new. new oil pump, (does same with stock).

tried multiple oil senders, gauges.

oil pressure rises to 18psi and stays, doesnt vary with rpm.

removed front cover, cam is dripping with oil. but no circulation to rockers.

only thing not brand new in this engine is lifters, cam, pistons, rods, crank, and rockers.

the oil pump is pumping oil, but it doesnt go to the very top end (rockers)

i am stumped. i have no clue what it could be.

i thought about lifters, but what is the odds of all the lifters being stopped up. and why is there only 18psi oil,

and it doesnt vary with rpm.

thanks for your help. and am eagerly waiting your reply.

dca1042

have refitted the barbell shaped oil restictor behind the back cover(rear main seal cover),
it is a plastic barbell shaped part,about 2.5" long,if its not fitted i think this will be your fix.
let us know.
cheers dave

back in black

iTrader: (6)

barbell is in place. thanks for the insight.

any other thoughts? i am willing to paypal a lil cash to the person that actually figures out what is wrong. i am about to give up on this thing. this thing is new, only about 20 second of run time broke up in about 5 sessions.

nebur8

iTrader: (6)

did you ever get this ironed out? I'm getting the same issue with my lq9. It doesnt sound like oil is getting to the lifters, and oil pressure is jumping around even goes to zero at times. needless to say i dont run it for more than a few seconds.

Texas_WS6

iTrader: (9)

Do you have a remote oil filter? I do and when I first put it on I only had 25 psi, and it would not come up with rpm. I found I had it plumbed up backwords and it was restricting the oil flow. Is this thing a wet ot dry sump set up?

nebur8

iTrader: (6)

no remote oil filter, using the default location on an f-body pan. Stock wet sump setup.

ND2RACE

Well this ones kinda tuff to speculate over the internet. Things I'd check screen in teh oil pick-up, make sure the bar-bell restrictor isn't pushed in too far (it should rest against the rear cover), bearing clearances, that the oil pick-up is properly sealed to the pump. Interesting problem, hope you can figure it out.

nebur8

iTrader: (6)

will let you guys know

bottlefed01z28

iTrader: (21)

i see your in pembroke pines if u would like my roomie is a gm master tech he and i could possibly come by and take a look at it

BlownChevySS

iTrader: (1)

If oil isn't coming up to the top, check the lifters. PM me if you want and I will give you my #. I am around the corner from you pines/davie area

nebur8

iTrader: (6)

hey guys thanks alot, i'm actually in weston now. had the car towed back to the mechanic. he did the install so hopefully he can diagnose it. Will let you know. I knew I should have done the work myself but I just dont have the time with a full time job and school, still kicking myself over it!