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Old 05-16-2017, 06:13 PM   #1
Julio Bro!
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Default Worn emission hoses = oil leaks...

I have a 2009 WRX from which oil is leaking. The culprit are the emission hoses that connect to the block and go up. There are two connections at each side of the engine (why two?), but seem to be different in size (diameter).

They are leaking at more than one spot, so replacement of the whole set or assembly is recommended. The problem is sites seem to sell the hoses individually (http://estore.subarupartswarehouse.c...12-050-07.html), not, like, in a replacement kit or assembly.

So, two options; is it a good idea to replace them with silicone hoses? Is there a silicone assembly or kit?

If not, is there a part number for the whole set or some site that sells a replacement kit?
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Old 05-16-2017, 06:44 PM   #2
thewolfe
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One is for crankcase ventilation, the other is a balance tube. I would stick with oem on those hoses as they are molded to fit. Silicone would probably work okay though. If you have lots of oil coming out of those tubes then you have some excessive blowby.
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Old 05-17-2017, 12:14 PM   #3
Samurai Jack
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You are much better of sticking w/the OEM hoses. The are already pre-formed for the best fit without any kinks. You do not want blockage for oil vapors to build up and the crankcase not to vent properly.

These are not sold in sets. They are sold individually.

and like thewolfe said, if they are actually leaking oil, you have a lot of oil blowby and it's building up inside the hoses ( which is a huge amount of blowby ) or you have a blockage somewhere causing the oil vapor to build up and then leak somehow ( cracked hoses? )

Make sure when you replace the hoses that any other vent tubes they connect to are free and clear
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Old 05-18-2017, 12:51 PM   #4
Julio Bro!
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Thanks for your advice. As for the leaks, the hoses are hard and brittle; the issue began a few months after replacing the gaskets (or fixing) the cylinder heads. I'm guessing the handling caused weakening and cracks; you can see them expanded at connections.

So, I'll verify exactly which hoses and go for OEM. Thanks again.
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Old 05-18-2017, 04:00 PM   #5
No Go
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Or go half assessed and take a sample to Autozone and buy heater hose...likely that is what someone did to your car.

Note: someone else just posted the above on the same question/different thread.

I would recommend new OEM like others have posted above. My originals lasted to 190,000 miles...no leaks. I replaced with OEM...a high quality rubber.
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Old 05-19-2017, 08:09 AM   #6
schoes
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Quote:
Originally Posted by No Go View Post
Or go half assessed and take a sample to Autozone and buy heater hose...likely that is what someone did to your car.
OEM or SAE 30R7 rubber hose. These are oil resistant and won't 'weep' the oil vapors like a heater hose would. Researching AOS threads may help you.

No Go is right, heater hose is probably what is on the car now. Unless they truly are very old.
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Old 05-19-2017, 12:17 PM   #7
mrsaturn7085
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I always thought silicone was more prone to fluid leakage due to 'weeping'. Heater hoses should be fine (though I still recommend molded OEM hoses) - usually the key factor in automotive hose selection is whether or not you're running brake fluid through the line (and pressure requirements). Fuels are a different story, entirely.
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Old 05-21-2017, 02:14 PM   #8
Julio Bro!
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These are the emissions hoses, EGR-PCV and such 2 or 3 sections are leaking. I have 89K in the odometer, plus Puerto Rico is very hot in the summer...up to 93 degrees daily, suddenly it rains. Quite the drastic change in temperatures for 9 years.
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