stagea_1998 Posted November 18, 2013 Share Posted November 18, 2013 So here's the deal guys.I've got oil spraying out of my dipstick tube as well as pushing my dipstick out of the tube about 150mm each time.so clearly im getting pressure in the crank casebut ive tried all i can think of now im out of options, so far ive:-replaced the PCV valve with a new genuine unit from nissan. -checked all breather hoses to make sure they weren't blocked. -done a compression test to make sure i wasn't getting excessive blow by that was causing oil to spray out. (read 140psi across all cylinders)now thats where ive hit a wall..... i cant think of anything else to check =\any ideas?appreciate any help...thanks. Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/ Share on other sites More sharing options...
MrStabby Posted November 18, 2013 Share Posted November 18, 2013 You've done the right things to diagnose.... is the dipstick really loose? Ie the rubber perished/hardened? Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112109 Share on other sites More sharing options...
stagea_1998 Posted November 18, 2013 Author Share Posted November 18, 2013 just went and checked the rubber is pretty hard around the seal but its still fitting pretty firmsurely though that shouldnt justify oil spraying out of the tube right?? Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112131 Share on other sites More sharing options...
Got a Pulsar Posted November 18, 2013 Share Posted November 18, 2013 May seem like a Silly but, The oil level is Normal? Not Crazy Full? Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112197 Share on other sites More sharing options...
stagea_1998 Posted November 18, 2013 Author Share Posted November 18, 2013 haha if only it was something simple like that....id kick myself if it was thoughbut nah oil level is fine definitely not overfilled Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112247 Share on other sites More sharing options...
SkudR33 Posted November 18, 2013 Share Posted November 18, 2013 Maybe some of the oil drains and/or turbo drain are clogged... I got similar problem whereby if I park my car on a hill it burns oil out the tail pipe... Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112257 Share on other sites More sharing options...
stagea_1998 Posted November 18, 2013 Author Share Posted November 18, 2013 well damn i hope thats not the case....... im not getting any smoke blowing out the exhaust so thats not looking likely in my case but i might still look into that if i cant get it sorted otherwise Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112271 Share on other sites More sharing options...
StevenCJR31 Posted November 18, 2013 Share Posted November 18, 2013 might sound silly but is it the correct dipstick? it maybe showing FULL but it could be WAAAY overfull if its the wrong one Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112514 Share on other sites More sharing options...
533 RYC Posted November 18, 2013 Share Posted November 18, 2013 Doing a comp test is all good & well for an N/A application, BUT, what's to say your rings are not responding when boost pressure is applied? The only way to truly cancel out your rings would be to do a cylinder leak down test. I build, run & tune LARGE turbocharged stationary engines. I've encountered this issue before. Customer complained about an oil leak. Discovered to my surprise when going from idle to load @ about +10''Hg (max is 30Hg/14.7psi)) crankcase pressure was going from -.5'' H2O to +25'' H2O & popping both dipsticks along with twin fountains of oil till the rings responded at about +15''Hg then everything would settle down. This particular engine had issues rejecting heat through its heat exchangers, its dump radiators were too small & subsequently had alot of high jacket water temp shutdowns. Piston rings hate heating up & cooling down. if the temps are high enough, over time, they start to lose their tension & don't respond very well to pressure changes. Pressurizing your crankcase to the point of popping the dipstick out can only come from one place. The only other thing I can suggest as 'for the time being' fix is to get a little bit of heat shrink (for wiring), place it over the rubber, heat it & refit your dipstick to stop it popping out. Then just hope you don't start blowing out other seals! Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112714 Share on other sites More sharing options...
BuuBox Posted November 18, 2013 Share Posted November 18, 2013 I was just going to suggest a leak down test. 140psi compression test result isn't brilliant, especially if that was after cranking for a while. Do you have a catch can fitted? I got similar problem whereby if I park my car on a hill it burns oil out the tail pipe... Valve stem seals? Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7112753 Share on other sites More sharing options...
Muff Posted November 19, 2013 Share Posted November 19, 2013 I got similar problem whereby if I park my car on a hill it burns oil out the tail pipe... I was thinking more like Turbo oil seals... Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113391 Share on other sites More sharing options...
stagea_1998 Posted November 19, 2013 Author Share Posted November 19, 2013 Doing a comp test is all good & well for an N/A application, BUT, what's to say your rings are not responding when boost pressure is applied? The only way to truly cancel out your rings would be to do a cylinder leak down test. I build, run & tune LARGE turbocharged stationary engines. I've encountered this issue before. Customer complained about an oil leak. Discovered to my surprise when going from idle to load @ about +10''Hg (max is 30Hg/14.7psi)) crankcase pressure was going from -.5'' H2O to +25'' H2O & popping both dipsticks along with twin fountains of oil till the rings responded at about +15''Hg then everything would settle down. This particular engine had issues rejecting heat through its heat exchangers, its dump radiators were too small & subsequently had alot of high jacket water temp shutdowns. Piston rings hate heating up & cooling down. if the temps are high enough, over time, they start to lose their tension & don't respond very well to pressure changes. Pressurizing your crankcase to the point of popping the dipstick out can only come from one place. The only other thing I can suggest as 'for the time being' fix is to get a little bit of heat shrink (for wiring), place it over the rubber, heat it & refit your dipstick to stop it popping out. Then just hope you don't start blowing out other seals! some really good info there thanks man probably an easy fix there with a bit of heat shrink, but im not looking for a cheap fix here id rather get it sorted properly and like you said id likely start popping seals lol....read up on another forum some guy just clamped the tube with a pair of vice grips looks like i should defiantly go ahead with a leak down test then and see how shes looking I was just going to suggest a leak down test. 140psi compression test result isn't brilliant, especially if that was after cranking for a while. Do you have a catch can fitted? Valve stem seals? nah mate no catch can....... would be curious to see if im getting anything blowing out through the breathers as well as the dipstick now that you mention it Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113533 Share on other sites More sharing options...
ARTZ Posted November 19, 2013 Share Posted November 19, 2013 if valve stems gone would be blowing smoke..... whatever it is a catch can set up would help relieve it for now...its a good enough and cheap temporary fix anyway... how hard are you driving it? Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113543 Share on other sites More sharing options...
Muff Posted November 19, 2013 Share Posted November 19, 2013 Antz. U thinking a vented can? Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113617 Share on other sites More sharing options...
stagea_1998 Posted November 19, 2013 Author Share Posted November 19, 2013 defiantly worth doing then if you think it will helpbeing that the breathers run back to the intake though wouldn't that cause a vacuum in the lines from the pcv valve and through the breathers though??hence its at negative pressure anyways?.... thats just a guesshaha well lets just sayI've got a heavier foot than brian o'connor.... pretty hard Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113620 Share on other sites More sharing options...
ARTZ Posted November 19, 2013 Share Posted November 19, 2013 Antz. U thinking a vented can? yup..would have to be...you could just stick little filters a top your cam cover vents , but this will most likely spray oil everywhere... anyway, to keep it simple.. if can is vented, block pcv...if can plumbed back to intake, retain pcv... i could tell you not to drive it so hard but you would probably laugh at me Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113702 Share on other sites More sharing options...
Muff Posted November 19, 2013 Share Posted November 19, 2013 If u need bud I can make u a vented can. But me thinks ur problem will be increased buy the -5s u just bought. Enjoy. Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113729 Share on other sites More sharing options...
stagea_1998 Posted November 19, 2013 Author Share Posted November 19, 2013 If u need bud I can make u a vented can. But me thinks ur problem will be increased buy the -5s u just bought. Enjoy. haha i know right.... thats why im tying to nut this out before i chuck em on shit timing how it kinda came up the day i paid for them ...... lol you do some fabrication work do you? i actually do think i "might" have a catch can off my old 33 in the garage somewhere ill have to have a look ....but otherwise ill get back to you about that one Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113759 Share on other sites More sharing options...
Muff Posted November 19, 2013 Share Posted November 19, 2013 No worries. Yeah I do dumps and intercooler pipes and cans and stuff. Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7113767 Share on other sites More sharing options...
533 RYC Posted November 19, 2013 Share Posted November 19, 2013 A catch can won't really help, you'll only be increasing the size of your crankcase a little. If a leakdown test fails to show where the problem is, then testing on a dyno to actually measure the crankcase pressure is what will be needed. In my previous post I mentioned a water column measurement: +25" H2O. This is only about 1 PSI. It was an 18 litre 6 cylinder. It didn't take much pressure to lift the dipsticks. Just letting you know even a little pressure loss can do big things. When you do a leakdown test, try to test in KPA not PSI. Link to comment https://www.sau.com.au/forums/topic/435182-oil-spraying-out-of-dipstick/#findComment-7114027 Share on other sites More sharing options...
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