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YOUR RESEARCHCrankcase breather hose / AOS related - cracked?!
Leading reported evidence
Replace slightly since the original part was manufactured
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Performed · outcome unconfirmed · Original poster
the part has changed slightly since the original part was manufactured.
Leading evidence: 'Replace slightly since the original part was manufactured' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check ."' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Then check that the valve will hold pressure by filling with rubbing alcohol
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Suggestion
Though it�ll take you an extra hour or two, I recommend lowering the engine to the rear crossmember, and then removing the entire intake apparatus.
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Suggestion · Original poster
I recommend trying to source the older style part with both ends curogated if you plan to tackle this without dropping the engine.
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Hey there,
Working on replacing my AOS (1999 C2 3.4).
Pulled the drivers side intake manifold off and swapped out the AOS successfully, failed miserably - oil all over the case + some in the intake plenums.
While doing all this I noticed the hose which connects the AOS and winds across the top of the engine to the passenger side of the engine has some very very slight oil weeping where the corrugated plastic meets the hard pipe. Should I be concerned about a vacuum tight seal for that line? ...the slight weep isn't a huge concern for me.
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Should I be concerned about a vacuum tight seal for that line? ...the slight weep isn't a huge concern for me."
Uhhhhhhhh, yeah! While you're replacing that hose/line you should probably clean the leaves and other crap (good chance there's a bit of mouse poop on there) off the top of the engine as well...
... Geeeezzzzzzzzzz
Thank you for the quick replies.
I'm already dreading how I'm going to remove the pipe where connects to the passenger side. Big coolant hose in the way. You think I need to remove the right hand side intake manifold?
Planning to get a shopvac in there to pick out all the leaves
Yes remove the right side plenum. Its not hard to do after its removed. There is also a check valve 90* fitting and an o-ring on the right side that i would replace too.
Though it�ll take you an extra hour or two, I recommend lowering the engine to the rear crossmember, and then removing the entire intake apparatus. This will make replacing that tube as well as cleaning up the top of the engine MUCH easier
Good Luck
I'll vacuum out the mouse nest before removing any more intake manifolds. Thanks for the input everyone, it's much appreciated.
....I'm surprised I didn't have an engine fire yet... there are a lot of dried maple keys and parts of leaves up there. Way more than in the corner of the pic I posted. 4-5 handfuls!!
While I have your attention, do I need to remove the big coolant hose on the passenger rear side of the engine to tackle the hose connection at the top of the head? ...quite a bit of residual oil has spilled out of that area.
Also... any thoughts on snaking out the breather line without removing the passenger side manifold... just checking.
Uber_Moto - I just replaced mine yesterday evening while changing AOS. I found the tube leaking requiring replacement. So, as I already had the AOS and driver�s side intake removed all I needed to do was swap out the corrugated hose. My situation is of course different than yours. What I did was to remove the two screws holding in the hose on the opposite end from the AOS, over on passenger side of the engine. Really not hard getting to the bolts, once removed I then tied a string to the AOS end of the corrugated hose�then pulled the hose out the passenger side of the engine. The string made it very simple to pull the new hose back through along the same path as the original. Not a hard job but that will depend on your engine configuration at the time of replacing the hose, the more you remove the easier it�ll get. Word on AOS, if I ever have to replace it again�I�m pulling the motor! Hahaha Enjoy working on your car.
Yes removing that large hose makes the job doable.
If your cylinder head in that area has a dirty oil buildup you will need to take the safety valve off as well and replace its �o� ring. Then check that the valve will hold pressure by filling with rubbing alcohol
turn upside down and valve shouldn�t leak.
"Also... any thoughts on snaking out the breather line without removing the passenger side manifold... just checking."
No way...
Even if you get the existing one out, you'll never get the new one in. I tried to get that hose snaked across the top of the engine with the intake runners/manifolds in place (with the engine out of the car !) and it wasn't possible (I had forgotten to connect it before installing the intake system)... Do yourself a favor and just remove the intake/throttle body setup... Good Luck
I already have the drivers side intake off + both plenums & the vacuum chamber (which, surprisingly, isn't cracked - replacing with a new one anyway $30).
....thinking I can get air/oil breather line out as is. I'll report back.
In the meantime, has anyone installed the much less expensive JL version of this breather line?
https://www.vividracing.com/engine-o...151781260.html
The part # is correct. If you want to be the guinea pig and check it out, I'm sure the forum would appreciate it! Seeing as you've already done the job once, the only question is whether you want to do it again if/when the less expensive part fails. For me, and the difference in price I'd probably give it a shot. I'm sure that at the very least the hose should last a few years... Good Luck
So I ended up ordering the OEM crankcase breather hose since I don't want to do this job EVER again.
WARNING... the part has changed slightly since the original part was manufactured. The old hose was curogated on both ends... making it easy to manipulate into place. The new part is now only curogated at the end were it meets the AOS. Meaning the remainder of the part is hard plastic tubing. Making it nearly impossible to install with the engine in.
I had the drivers side intake manifold off and both plenums + throttle body removed.
HOWEVER... after warming up the plastic with boiling water and attaching a string to the end... I was able to weave it under the passenger side intake manifold. This is we're you risk snapping the new part... as the tube is pre-bent. After pleading with the omnipresent Porsche gods and some carefully applied muscle I was able to bend the pipe enough to get it all the way through. Took about 3hrs for this win.
Removing the passenger side intake manifold would NOT have made a difference.
I recommend trying to source the older style part with both ends curogated if you plan to tackle this without dropping the engine.
i disagree. I had both intakes out with the engine in and the ac compressor loose. I didnt find it all that hard to replace mine and the pass side intake is much easier to pull because there is no coolant resi in the way.
