Turbo peeps, step inside...
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Turbo peeps, step inside... I'm in the process of pulling my motor out of the car as I am chasing a low oil pressure issue and have a question about turbo and their respective oiling.
My car had been on jack stands for about a month and it was only jacked up in the front. I notice oil starting to pool and slightly drip from the space between the turbine housing and the down pipes on both sides. This wasn't really anything new to me as I have seen it before if it sits a while, especially as if its parked on a hill.
Long story short, upon removal of my drivers side turbo manifold, turbo assembly and downpipes, I notice that oil is literally dripping from out of the downpipe....mainly on the drivers side but there is some moist residue in the passenger side, too. This is something I have never seen previously upon teardown.
These turbos are freshly rebuilt and probably don't have 50 miles on them. What I am wondering is this:
-Is this completely abnormal even for it to sit with the front of the car up for 4-5 weeks?
-Could this cause the same symptoms that something like an internal oil leak would cause? ie - 36-40 psi cold start, 10-12 psi hot and it NEVER rises above 25 psi no matter what RPM the car is spun to.
My car had been on jack stands for about a month and it was only jacked up in the front. I notice oil starting to pool and slightly drip from the space between the turbine housing and the down pipes on both sides. This wasn't really anything new to me as I have seen it before if it sits a while, especially as if its parked on a hill.
Long story short, upon removal of my drivers side turbo manifold, turbo assembly and downpipes, I notice that oil is literally dripping from out of the downpipe....mainly on the drivers side but there is some moist residue in the passenger side, too. This is something I have never seen previously upon teardown.
These turbos are freshly rebuilt and probably don't have 50 miles on them. What I am wondering is this:
-Is this completely abnormal even for it to sit with the front of the car up for 4-5 weeks?
-Could this cause the same symptoms that something like an internal oil leak would cause? ie - 36-40 psi cold start, 10-12 psi hot and it NEVER rises above 25 psi no matter what RPM the car is spun to.
I know you said the turbos are new but.... there shouldn't be oil in the downpipe, check the seals in the Turbo. The culprit may be bad oil drainage from the Turbo or too small of a drain. What size drains are you running? Maybe it was a botched Turbo rebuild? There should never be oil leaking from the Turbo, inside or out.
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
I know you said the turbos are new but.... there shouldn't be oil in the downpipe, check the seals in the Turbo. The culprit may be bad oil drainage from the Turbo or too small of a drain. What size drains are you running? Maybe it was a botched Turbo rebuild? There should never be oil leaking from the Turbo, inside or out.
My question is this: if it is leaking past the seal(s), would that cause a low oil pressure issue like described above??
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Probably the turbos man... do you have 90° bends on the drains? Just throwing stuff out there... would've been a good idea to disconnect the oil to the turbos and see if the oil pressure changed, that would've let you know if it was in fact the turbos causing the low oil pressure.
TECH Apprentice
Joined: Mar 2006
Posts: 361
Likes: 1
From: australia
oil out the exhaust ?
check and see if its coming out of heads / exhaust first
rtv or gasket partialy blocking drain of turbo
too small drain
drain in sump / engine blocked or pressure on it ( like oil flung of crank, getting pushed into drain hole)
excess crank pressure
turbine shaft / assembly not balanced correctly
wrong turbine shaft seal.. like cranks etc, the bearing housing can be bored overside, and o.s seals fitted to shaft, soo wrong seal part number can not seal gases from getting into the oil cavity inside turbo
check and see if its coming out of heads / exhaust first
rtv or gasket partialy blocking drain of turbo
too small drain
drain in sump / engine blocked or pressure on it ( like oil flung of crank, getting pushed into drain hole)
excess crank pressure
turbine shaft / assembly not balanced correctly
wrong turbine shaft seal.. like cranks etc, the bearing housing can be bored overside, and o.s seals fitted to shaft, soo wrong seal part number can not seal gases from getting into the oil cavity inside turbo
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
The drains all see o be good because I've ran them this way for a couple years and it never did this. I am going to have the turbos inspected this week. I probably should have tested the turbos by pulling the lines but honestly I didn't know they could cause symptoms like that. Everything pointed me to an internal bearing issue or something behind the rear cover. I will probably go ahead and get the bearings checked and replaced in the motor.
