Author Topic: turbo return oil problem (Read 3847 times)

stevens · « **on:** October 10, 2008, 05:08:48 PM »

hi, i�m from portugal and have a 1994 E36! my mother language is portuguese and my english is poor, but i�ll do my best!
my car is now at a garage for turbo instalatio. the turbo is a garret t3, and the manifold is from obx. right now everything is mounted but soon after my mechanic fired the engine, black smoke started to come out, the oil was leaking fron exhaust side of the turbo! the return oil line from the turbo to the engine is mounted at the "screw" where engine oil is drained! can it be the cause off the turbom oil leak? do i have to drill the oil compartment a little bit higher? notice that because of the manifold and space, the turbo is mounted very low!
once again sorry about the english...

Boosted E30 · « **Reply #1 on:** October 10, 2008, 10:50:31 PM »

yes definatly i had this problem too you have to put the oil return above the oil level when the engine isnt running because the return line has to run/flow free you cannot have any resistance on the return or you will blow it out of the turbo seals so for your car i would drill a hole in the block above the oil pan and hope that your turbo oil seals arent blown which happened to me to because of that and make sure your return line is 2 times the size of the feed line if not bigger

stevens · « **Reply #2 on:** October 11, 2008, 05:53:08 AM »

ok, but the problem is that the turbo is mounted very low so the only possible way for drilling the hole doing a 90�degree angle at the return line from the turbo is were the oil pan starts, below the engine block. or should i drill the block and do a higher angle than 90� degree at the return line? by driling the engine block, the return line will have to be going up! is there a problem with that or its ok?

asubimmer · « **Reply #3 on:** October 11, 2008, 11:17:57 AM »

If you have it too low you may have to put an oil pump on the drain line...

Boosted E30 · « **Reply #4 on:** October 11, 2008, 04:49:35 PM »

you cant have your return going up that will create pressure you can use a 90degree elbow right off the turbo but you need somewhat of a down ward slope

vatos_p · « **Reply #5 on:** October 13, 2008, 01:37:56 AM »

i have it in the oil pan , as high as you can put it , i work turbocharged now 2 years with no problem...