white foamy discharg in oil filler neck
 

i pulled my car out of the paint shop today to find it smoking out the exhaust (more than usual). i checked and my oil smells heavily of gas. now i have run a search on that but my big concern is something else.

when i took off the oil cap i noticed a white foamy substance on the inside of the cap. and then i looked down to see that it was covering the inside of the oil filler neck. can anyone explain this? any ideas what is going on?


please oh please help me.

is your pcv system functional

sound like a dying water seal

my coolant system is as straight forward as it can get (i am running no emissions) so i donot have a pcv.

sounds like a buildup of gas and water in the oil do to a lack of crankcase ventalation

do you have one of the vac lines on the oil filler neck hooked up to the air filter?

it has its own air filter

look at the emissions removal tutorial at mazspeed.com. It's in the facts section. It explains how to make sure the oil system is vented to avoid the foamy crap you're seeing.

will this foamy crap hurt anything?

-greg

yup
thin out the oil and could cuase rust that would chip and get into the oil

run hose to the other hole near the neck
hook it to the carbs air filter and it shoud go away after driving a while

I ended up getting this after being stupid and running into the store to get another qt of oil while my hood was up, the cap was off the neck, and it was pissing down rain like a waterfall. The crap looks like someone hocked a lugi in your filler neck, or worse. :mspank:

I cleaned it out really well, and it never came back. Just something to think about. If you ever have the cap off in the rain, this may happen to you...:eek:

Brian

Yea Peejay calls it lungmustard LOL. rifraff, you MUST have some functional vent system or you will that this crap in the filler neck. VERY common to see after emissions/rats nest were removed, and not done properly. Yea study the tutorial near the end, it details how to restore that part of the system to functional status.

but strangly enough , i had the same setup on my old motor (an air filter attached directly to the neck) and i never had this problem.

does anyone have a copy of the tutorial? i cannot seem to get it off of mazspeed

as far as i knew i had a functional venting system. the tube coming out of the filler neck goes straight into an air filter. or does it actually have to be a vacume line coming off of it to properly vent (something like the vacume line for the power breaks)?

im gonna run a small filter right on the neck and see if i can get rid of the lung butter

now would i just plub the hole on the carb that the tube is going to now?

Look, just venting it to atmosphere isint enough. You need some pull on it to keep the case clean. You cant just hook it to vacuum cause itll pull the case pressure down too low, which will cause excessibe blowby/ oil consumption. You need a restriction of some sort. The stock system works great. As an alternative, plumb in an off the shelf PCV valve. Peejay swears by this setup.

Yeah, what Carl said. :D

Here are some threads where peejay talks about the PCV.

https://www.rx7club.com/forum/showth...&postid=951552

https://www.rx7club.com/forum/showth...&postid=771561

https://www.rx7club.com/forum/showth...&postid=158433

guess i will have to go the pcv route, since i am running without emissions and not using the stock carb either.

that for the clearification and help everyone.

"white foamy discharg in oil filler neck"

No emmissions and no stock carb? Sounds like gonorhea, have you checked with your doctor? Who you been seeing lately?
Ray

Put a rubber over your oil filler tube if you have the lid off and the hood open in the rain. It will prevent getting that white foamy discharge.

The tutorial server has been up and down all weekend undergoing heavy maintenance. Should be up and stable now.

Cheers.

as long as it is not lubricated , right

There is plenty of lubrication already. Basically whatever you normally keep in the car should be ok but be careful using the "French" or other exotic variety on a RHD car as they may be incompatible.

hopefully im not too late on this. so i rebuilt my engine then i didint know where the hoses coming out of the oil filler neck went to so i looked at the other motor i have in parts and i saw one hose that goes form the top hole to the bottom, after reading this i know that is incorect so wich one do i put the pvc valve on and what about the other hole do i just cap it.
https://cimg2.ibsrv.net/gimg/www.rx7...29bead0058.jpg

You can cap the lower one or do like I do an attach the tank vent line to it. Then run the pvc from
the top nipple and into vacuum on the intake manifold. You can tee into the vacuum for the brake
booster if not running an air cleaner with a nipple. Otherwise just attach the pvc hose to a nipple
on the air cleaner.