sqweekykneecap Posted September 2, 2012 Share Posted September 2, 2012 Gentleman, First off, thanks for viewing the thread. Right, Like stated in the topic description, the L28et i built last year (for my 74 260z) is burning oil. In only 13 days, JCCS in Southern California is going on and I'm still planning on attending w/ the Z Anyway! (It's all my fault, but hey, we have to learn...or research, which i failed to do) When i hooked up my oil catch can, (from crank case to catch can, back to intake) i did not reinstall the PCV valve on the intake. Thus caused excessive oil pressure. Which in turn, ruined my turbo seals (had to rebuild the HX35) and also ruined either my valve seals or rings. (performed a compression test, the results were the same from last year after i rebuilt the l28et. compression was fine) The head gasket is new and was replaced after the FAILED catch can install. (possibly 500 miles on it), forgot to mention. So, the engine smokes after putting around and driving conservatively. For example, sitting at a red light/stop sign i will notice more and more smoke around my car. Yet, when i enter boost it seems to "seal up", and after the +pressure, it will take a longer to begin to smoke. Like i stated before, the head gasket is new with <1000 miles on it, and something else was messed up (aside from the turbo seals) when i had the brief period of excessive pressure from not having a pcv valve installed. Question to you: 1.) Have you heard of this periodic oil burning problem before? 2.) Did I ruin my rings, valve seals, or something else? Thanks again, -Zach Link to comment Share on other sites More sharing options...
78zstyle Posted September 2, 2012 Share Posted September 2, 2012 Recently I started to smoke really bad through my valve cover vent. Like puffs of smoke coming out like a train when you take the oil cap off. I did a compression test and 1-2 were very low. I pulled the head and saw the gasket was a bit messed up, but not blown. I replaced it with a new MLS HG and inspected the cylinder walls for any scoring (from broken ring or anything). Nothing, smooth as glass. I put the car back together and it still smokes from the valve cover, oil gets in my bay pretty bad and I think I might be getting compression into my coolant. Link to comment Share on other sites More sharing options...
sqweekykneecap Posted September 2, 2012 Author Share Posted September 2, 2012 Recently I started to smoke really bad through my valve cover vent. Like puffs of smoke coming out like a train when you take the oil cap off. I did a compression test and 1-2 were very low. I pulled the head and saw the gasket was a bit messed up, but not blown. I replaced it with a new MLS HG and inspected the cylinder walls for any scoring (from broken ring or anything). Nothing, smooth as glass. I put the car back together and it still smokes from the valve cover, oil gets in my bay pretty bad and I think I might be getting compression into my coolant. REALLY. way to rape my thread **** stain. DELETE TOPIC. Link to comment Share on other sites More sharing options...
78zstyle Posted September 3, 2012 Share Posted September 3, 2012 REALLY. way to rape my thread **** stain. DELETE TOPIC. ..what? all Im doing is sharing a similar experience while looking for a solution myself. lol. Link to comment Share on other sites More sharing options...
Kash Posted September 3, 2012 Share Posted September 3, 2012 (edited) Might still be leaking oil across the turbo seal from too high of an oil pressure...pretty certain your oil rings and valve seals are fine, if they were replaced during the rebuild. Edited September 3, 2012 by Kash Link to comment Share on other sites More sharing options...
Kash Posted September 3, 2012 Share Posted September 3, 2012 Recently I started to smoke really bad through my valve cover vent. Like puffs of smoke coming out like a train when you take the oil cap off. I did a compression test and 1-2 were very low. I pulled the head and saw the gasket was a bit messed up, but not blown. I replaced it with a new MLS HG and inspected the cylinder walls for any scoring (from broken ring or anything). Nothing, smooth as glass. I put the car back together and it still smokes from the valve cover, oil gets in my bay pretty bad and I think I might be getting compression into my coolant. The last time I saw these symptoms I had a broken ring land on piston number 1 and there were no noticeable scars in the cylinder wall just low compression (130 while all others were 150+). Link to comment Share on other sites More sharing options...
rossman Posted September 3, 2012 Share Posted September 3, 2012 (edited) i did not reinstall the PCV valve on the intake. Thus caused excessive oil pressure. Please explain how no PCV valve equates to excessive oil pressure? Edited September 3, 2012 by rossman Link to comment Share on other sites More sharing options...
ctc Posted September 3, 2012 Share Posted September 3, 2012 Gentleman, First off, thanks for viewing the thread. Right, Like stated in the topic description, the L28et i built last year (for my 74 260z) is burning oil. In only 13 days, JCCS in Southern California is going on and I'm still planning on attending w/ the Z Anyway! (It's all my fault, but hey, we have to learn...or research, which i failed to do) When i hooked up my oil catch can, (from crank case to catch can, back to intake) i did not reinstall the PCV valve on the intake. Thus caused excessive oil pressure. Which in turn, ruined my turbo seals (had to rebuild the HX35) and also ruined either my valve seals or rings. (performed a compression test, the results were the same from last year after i rebuilt the l28et. compression was fine) The head gasket is new and was replaced after the FAILED catch can install. (possibly 500 miles on it), forgot to mention. So, the engine smokes after putting around and driving conservatively. For example, sitting at a red light/stop sign i will notice more and more smoke around my car. Yet, when i enter boost it seems to "seal up", and after the +pressure, it will take a longer to begin to smoke. Like i stated before, the head gasket is new with <1000 miles on it, and something else was messed up (aside from the turbo seals) when i had the brief period of excessive pressure from not having a pcv valve installed. Question to you: 1.) Have you heard of this periodic oil burning problem before? 2.) Did I ruin my rings, valve seals, or something else? Thanks again, -Zach When you say "burning oil" how much consumption are we talking? How many quarts per how many miles? Second question, have you checked for oil dropping onto the exhaust or other hot part? I have had that happen to me. Oil spray onto exhaust from lose banjo when pressure was high, but forward speed prevented visible smoke. Once stopped residue oil burned off, but pressure was too low to squirt. Also, if you do not have the catch can routed back to the intake you have the possibility of smoke. Almost every car that I have owned with just a valve cover breather smoked at one point or another from the breather. Link to comment Share on other sites More sharing options...
sqweekykneecap Posted September 3, 2012 Author Share Posted September 3, 2012 Please explain how no PCV valve equates to excessive oil pressure? ok, here i go. PCV not installed: i ruined my turbo oil seals and started leaking oil out my rear main seal. PCV installed: everything is fine. Link to comment Share on other sites More sharing options...
rossman Posted September 3, 2012 Share Posted September 3, 2012 (edited) Sounds like you got boost pressure into the crankcase and turbo oil return. Where is the smoke coming from? What color is it? Edited September 3, 2012 by rossman Link to comment Share on other sites More sharing options...
calvin280zxt Posted September 3, 2012 Share Posted September 3, 2012 REALLY. way to rape my thread **** stain. DELETE TOPIC. Link to comment Share on other sites More sharing options...
Mikelly Posted September 3, 2012 Share Posted September 3, 2012 Totally out of line dude... Maybe you're having a bad day, but you need to dial that nonsense back and apologize to the other member. REALLY. way to rape my thread **** stain. DELETE TOPIC. Link to comment Share on other sites More sharing options...
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