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Seek to understand,^Value
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Discussion Starter · #1 · (Edited)
How to test, clean, & redesign the original BMW dipstick guide tube (CCV vent clogs!)

Since I was replacing the holed boot to the ICV/TCV, I decided to check the oil dipstick guide tube and, much to my dismay, I found the concentric ring was clogged solid.

I checked the CCV thread which shows they redesigned it to eliminate the troublesome concentric tubes - but this thread is for those many of us with the original dipstick guide tube.

Since it's in my hands - and since I have ZERO experience with this problem ... I ask for all who are similar:
Q1. How do those with experience suggest we clean our dipstick guide tubes?

Q2. I lost the o-ring while blowing garden hose water on the dipstick; do you think the exact right size matters? BMW has the o-ring in stock ($3.83) but I'd have to button it up to get there. I can fit a garden hose washer on for now. Does it stand a chance of working?

Q3: How can we test whether our dipstick guide tubes are clogged or not - WITHOUT removing them from the vehicle like I did?

 

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I would use some brake cleaner to try and wash that gunk out.

When I did my ccv It seened like the o ring needs to sit inside the hole fro the dipstick tube. I had a hard time getting the new one in so i lubed it up with some oil gave it a tap with the hammer and it sliped in. I guess what im getting at is if it fits and doesnt leek It should be fine.
 

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Seek to understand,^Value
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Discussion Starter · #3 · (Edited)
I would use some brake cleaner to try and wash that gunk out.
I tried gasoline in a big plastic bag - but I think I need something mechanical to loosen it a bit. I will keep trying things - but ideas are always welcome because I want to try to do this before heading back to the dealer for the o ring.

It seemed like the o ring needs to sit inside the hole for the dipstick tube.
Yikes! If the o-ring fits INSIDE the top of the oil pan housing, my garden-hose washer likely won't go inside (it will sit on top). That will change things!

Called Stevenscreek BMW (they're open 'till 5pm). They have the o-ring (19,5x30 in stock, P/N 11431740045, $3.83); but they don't have the dipstick guide itself ($117).

Also, I broke the plastic clip on the side of the dipstick guide - but I don't see a part number for it (#17 below). In fact, I don't even see a non-ENDED part number for the oil dipstick guide tube.

But, the most important question is what happens (now that my dipstick is clogged) if I put it back?

 

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Seek to understand,^Value
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Discussion Starter · #7 · (Edited)
No posts from you in ages
Nah. I just took Bill's advice (540iman) and stayed away from casual reading & OCD cross posting in a vain attempt to help everyone out as much as I could. Looks like people eventually find their answers and the board does jiust fine w/o me :) (which was Bill's point all along).

Use compressed air. That will get every out.
I wish. I tried blowing air from a hand gun hooked to the compressor. No go. The crud is jam packed in there. It's like solid sand was compressed inside - it's that packed.

It's soaking in gasoline as we type. I've got the CCV side tube clear almost to the main tube ... dark brown stuff ... now I'm digging out the concentric space from the bottom of the main tube. It's tiny in there (I'm using 20 AWG wire but it bends a lot).



try some pipe cleaners or guitar strings
I have some piano wire ... I'll try that and report back. I missed the 5pm closing time for the local dealer for the o-ring too. Sigh.

EDIT: Ok. The first wire I used was far too soft ... but the second wire (what I erroneously called "piano wire") was just the right diameter and it was very rigid (for wire). This feeding wire came with the tent-pole elastic string from REI or Western Mountain Sports that I used to fix my camping tent poles). Nice and rigid and thin and long.

That feeding wire allowed me to scratch away at the crud, which was packed, starting two inches from the bottom, all the way to about two inches from the side opening to the CCV drain hose.
 

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I used wd40 and compressed air to clean mine. If it's really bad, you might be better of chucking it and buying a new one.

For the o-ring I just stuck the old one back on till I got the new one. Of course that was a month ago and the new 0-ring's been sitting on shelf since then collecting dust :)
 

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Discussion Starter · #10 · (Edited)
I used wd40 and compressed air to clean mine. If it's really bad, you might be better of chucking it and buying a new one.
It 'was' really bad. I can't imagine too many people having the patience to clean this thing every few years. Now I know why the new redesigned dipstick guide tube exists. I would have gotten it, had the dealer had it in stock (and could I have gotten to them).

Alas, I started digging for about 20 minutes, scratching away with the (not piano) wire. It was working - but verrrry slowly.


Then the idea hit me to use a drill!


But the wire was too short - so I used a longer wire. Viola! Finally I could blow through the tube from the CCV drain hose end to the bottom out the concentric tube!


For the o-ring I just stuck the old one back on till I got the new one. Of course that was a month ago and the new 0-ring's been sitting on shelf since then collecting dust
I didn't have an o-ring (I don't have any idea where mine went because the last I saw it was when I was washing in the grass with the garden hose set to forceful blast.

For now, all I had was a washer for the garden hose. It seems to work - but how would I know if it wasn't working?



The return allows oil condensate from the CCV to return to the sump. Over a long period of time, you would experience oil consumption. But in the near term, you can drive the car as is.
I'm sorry but I don't understand.

If the vapors condensed in the CCV tried to drain into the oil pan but couldn't drain because they were blocked ... wouldn't they just back up into the CCV?

Would the pressure burst the CCV drain hose?

Would the liquid finally back up higher and higher (filling the CCV?) or would it drip out?

Q1: Where does the liquid oil go if the CCV concentric drain is totally blocked?

Q2: How often do we need to clean the CCV concentric drain?

Q3: How does the dipstick guide tube work anyway (for example, why the hole)?


EDIT: EDIT: This isn't piano wire. I just realized it's leftover wire that came with the REI or Western Mountain Sports kit to replace the elastic in the tent tube poles for camping.
 

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Seek to understand,^Value
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Discussion Starter · #12 · (Edited)
Is there a Fastenal Store near you? They would have the diameter ) ring that would do the job.
I would have had no problem buying the o-ring, but I needed the o-ring to get to the dealer - so - now that it's in - if it's working - I do NOT want to open it all up again!

One question that was brought up earlier in this thread:

Q: With the proper o-ring ... does the o-ring itself, once in place, sit ABOVE or INSIDE the oil tank?
Q: What will happen if it's not there in the right place? (i.e., what should I look for?)

PS: I think my garden hose washer is 'outside' the oil tank.

 

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Please don't use gasoline as a cleaner or in open containers...way too dangerous.
Open container of gasoline (vapors), drill motor running and metal on metal cleaning...I see big chance of a spark and boom!
 

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Short term, there really isn't a problem. You probably will lose some crankcase vacuum & potentially, some oil could slosh out of the hole, but I kind of doubt it. With the right o-ring, it is really hard to push the dipstick in & get it fully seated without cutting the o-ring. I used some AC o-ring lube called "Nylog" and it popped in pretty easily. When it it fully seats, you will feel a definite pop.
 

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Discussion Starter · #16 · (Edited)
It should sit on top of the oil tank to create a seal where vacuum doesn't escape---
Thanks. I think, with the garden hose gasket being so big, it's probably sitting on top (I can't actually see it though).

I see big chance of a spark and boom!
Now you tell me! I hadn't even thought of that - but you have a point.

With the right o-ring, it is really hard to push the dipstick in & get it fully seated without cutting the o-ring.
Oh. That implies the o-ring sits INSIDE the metal housing. ???

EDIT: This picture, taken a few days later, shows the garden-hose washer in situ. I can't tell if it's inside, or outside, or both???
 

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Hi Guys,
I know you have been successful in un blocking it, this works well for vintage cars with blocked fuel lines.
Here is the answer to your problems, to un block the tube get a length of the iner speedo cable from the wreakers yard long enough for the to go down the blocked pipe and out the other end.
Attach said iner speedo cable to a battery drill and insert the end into the pipe and start drilling it through the gunk, some carb cleaner could be useful for a lubricant and to flush it out afterwards.
Dave.
 

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If the vapors condensed in the CCV tried to drain into the oil pan but couldn't drain because they were blocked ... wouldn't they just back up into the CCV?

Would the pressure burst the CCV drain hose?

Would the liquid finally back up higher and higher (filling the CCV?) or would it drip out?

Q1: Where does the liquid oil go if the CCV concentric drain is totally blocked?

Q2: How often do we need to clean the CCV concentric drain?

Q3: How does the dipstick guide tube work anyway (for example, why the hole)?
I believe the answer is yes, the oil would eventualy back up and clog the CCV resulting in total CCV failure. I don't think it would burst as it is not under pressure. I believe what then happens is that the liquid oil then goes into the intake manifold, via the connecting line and return pipes, where it is burned during combustion. That is when you see the black exhaust smoke and higher than normal oil consumption.
I don't think driving it is a near term problem because this problem existed before you decided to pull the dipstick tube. Hence, it has probably been clogged for awhile. Have you been experiencing smokey exhaust or higher than normal oil consumption? Is there mayo in your vent hose? That would tell you things are backing up. If not, I am sure it is OK for driving as is. But the problem needs to be addressed at some point.
 

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Thanks. I think, with the garden hose gasket being so big, it's probably sitting on top (I can't actually see it though).

Now you tell me! I hadn't even thought of that - but you have a point.

Oh. That implies the o-ring sits INSIDE the metal housing. ???
Drill motor, even cordless will produce sparks (internally) and if there are gasoline vapors.....well, don't even want to think about it.... :(
 
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