gasket plenum chamber
Hi, i recently took off the plenum chamber to have a go at polishing it later maybe. The gasket, red paper type one was torn and pretty crappy and there was light film of oil around it.
Went to Holden and the new gasket is a metal and rubber one (about $40 bucks). Went home cleaned off old gasket, which was pretty stuck in places. Slapped new one on.
Took pl chamber off the other day, its been about a month to have a look. Gasket is still good but there was oil again around it.
Should i have put a gasket goo as well. Does a little bit of oil matter.
Cheers.
where are you finding oil?? sure it's not oil coming from the pcv system?
Gday monaro327, picture the pl chamber taken off, now you are looking at the two gaskets ontop of the v6 side by side. The six chambers (air intake?) there is oil around there. The pl ch sits flush on this.
Dont think its the pcv, but im gonna take a better look at it again.
Thanks mate.
CHE Tuned 156.8rwkw
Got any pics?
There shouldnt be any oil in or around the air intake.
The Blue One
Originally Posted by buddaboy1990
The Only 6sp VZ Wagon
oil can build up in around the intake from the pcv
EASTERN CREEK JCNSW 2009
Will do pics tomorrow. Thanks
if your the sort to explore to upper area of the rev range i'd bet it's just the pcv putting a bit of oil through your intake.
Hang on that makes sense. So a little film of oil from pcv is no problem? Even with gasket goo oil would still turn up. Thanks thanks.
mate if you push your car hard oily vapour is going to be vented from the crank case into the intake and incoming air is going to carry it all through your intake manifold and runners. over time the vapour wuill build up into a oily film.
CHE Tuned 156.8rwkw
I was told that wasnt the case, im proven wrong.
The Blue One
now i see what you mean that is weird!
Is this amount of oil normal? It was there with the old red paper gasket as well. Bolts are done up tight.
those metal gaskets are good i just dont see how oil is getting past them. the amount of oil isn't the issue it's where it is!!
if your not getting check engine warnings and the car runs smooth i wouldn't worry.
Nah overall car runs fine. I will polish that bloody pl chamber one day, then im gonna clean all around, then pull it off after a week and take another look. Thanks.
Exhaust Guru
Perfectly normal. I'll explain why.
You have a rubber seal on a metal gasket, when you tighten the bolts the rubber seal compresses only until the metal gasket makes contact. Metal is not as elastic as rubber (flexible) and will not compress as much as rubber will. The pressure inside the plenum will force oil past the rubber seal. As said previously, the oil is probably from the PCV so it is nothing to worry about.
Thanks, make sense. I worry more nothing.
Keeps me Broke
Hello everybody. I have a VZ Calais with an LY7 ( a tech 190) Its now reached 140,000 and the plugs are well over due. So yesterday I set about pulling the upper intake manifold (plenum) off. While taking all the hoses plugs and disconnecting the throttle body from the CAI Pipes I found the bottom 1/3 of the throttle body was dirty with an old burnt layer of oil. When I removed the entire pipe from the air filter box to throttle body I noticed there was several table spoons of oil stored in those arm like things that come of the pipe. I hope Im explaining this right as I dont have the Workshop manual in front of me to give you the right names of these parts.
I just quickly mention that I too have had oil around my gasket in the same way mentioned above. However that oil was clean oil, like brand new. However the oil found in the plenum, the throttle body and then seemingly collected in the intake pipes was dirty, very dirty.
I too cannot explain where the clean oil found around the gasket is coming from, etc, to me it appears to be on what should be the dry side of the gasket (for me ruling out the PCV) however I think I know what has caused the oil in the plenum, throttle body and intake pipes. I had a friend convince me he was an expert in automotive and he could help me by at least changing my oil. He just kept topping it up till it reached the right mark on the dip stick (after draining and changing filter) He did not take into account the drain down time and basically over filled the motor. When I checked the dip[stick it was 10 - 15 mm above the full line. When I change the oil, I let the oil drain for at least 30 mins, if not for several hours. I then research the correct oil capacity of that motor, either from a workshop manual or online. I realise many people dont bother with work shop manuals, but when I began (but didn't finish) my apprenticeship my Boss and lecturers at TAFE insisted on researching almost everything (if you diodnt know for sure) so now its just habit. so According to my WSM a drain and refill, including oil filter change will require 4.3L of oil. Indecently This WSM is my first Max Ellery vehicle repair manual and I am thoroughly disappointed. There are a million spelling and grammatical errors, as well as in may cases it makes reference to sections of the book that dont exists. It would apear that even Gregory's are better lol. So if you looking at buying a WSM for your VT to VZ, you might want to leave the Max Ellery as a last resort.
After over taking a vehicle with a little throttle and high RPM she blew a gasket from too much oil pressure ( I wish I had gauges for that, I will soon), I am assuming that the oil in my plenum, throttle body and intake pipes was from the same thing, and I assume that it came in via the PCV.
The car still ran fine, al be it a rough idle and a loss of 10 to 20 % power (which I used to think was the plugs. I guess Ill found out later today) So what I want to know is what is the safest way to clean out my throttle body and plenum, with out removing all the servo motors, sensors, and other electronic add on stuff. Should I wash it out with petrol, degreaser, WD-40??? Im just wondering, which will have the least affect on delicate parts (if any)
I am still in the process of reading other forums articles (they are all lined up in tabs in my browser, this page was just the first) I do not have access to an acid bath (but obviously other stuff needs to removed for that), I do not have access to a Compressor and air gun (at least not before I need to drive on Tuesday the 19th, today is Sunday 17th) so I need to know what solvent will best remove the oil and stains but with out needing that solvent to be thoroughly removed. Any help will be greatly appreciated, thanks in advance
P.S. if possible please reply today (Sunday) if you can, otherwise it won't help me, but of course still reply as you may be helping somebody else.
Keeps me Broke
Edit: there should be a post before this. It seems to have disappeared, unless its still waiting for moderator approval, however this post has somehow appeared before my first post...
Ive just come back because I have just been reading a Yankee forum about oil being found in intake plenums, throttle body's and the like. I think from what I have read that most stock standard car manufacturers reason that your not going to cane the living Jesus out of your car all the time ( dunno where they get that from) so they dont make your car with one of those oil catch cans you often see on performance motors and race cars.
The reason Race Cars have oil catch cans (or at least one of the reasons) is because they are expecting that the motor will be given a lot of load and the PCV will dump oil and oily vapor in for re-burn. So to keep the plenum and Throttle body clean they use oil catch cans. I have seen them at SCA and while they look nice I never really knew for sure what they where for.
Also apparently as your motor gets older and worn, the PCV will dump more oil back for re burn too. Im not sure why, but apparently this occurs.
I just want to stress that what I am saying should not be considered Gospel as I am very in experienced with modern advanced engines. In my day it was all Cross flow's 186's, RB 30's Push rod & carby V8's and Fuel injection on Aussie petrol cars was only being introduced in very basic ways, like CFi etc. So these modern Alloytec are really stretching my knowledge, I have only basic performance knowledge too. So yeah before you go thinking an oil catch can will stop this it might be a good idea to research it first or wait till I come back with my results of an oil catch can. Good luck and thanks for any feed back on my probs !
Last edited by 06Calais; 17-04-2011 at 03:10 PM.
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