Need Help! Excessice crankcase pressure - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 24 (permalink) Old 09-23-2015, 02:34 AM Thread Starter
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Need Help! Excessice crankcase pressure

My car is leaking out the rear main seal from excessive crank case pressure.


I came to this conclusion after fixing the oil pan gasket and it then still leaked. so I searched the internet and found this thread, Oil leak from weeping hole at pan/tranny joint: rear main seal - Mazdaspeed Forums #2 post, where they say they have the same problem cause which was caused by excessive crankcase pressure. they didn't say how they fixed it though.


My car is a 2006 3s. Rebuilt motor .020 over with all forged internals and BSD delete, VTCS delete, Corksport OCC.


I am thinking it is the PCV valve maybe. the only thing I can think of that is causing the excessive pressure.


Any help is appreciated
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post #2 of 24 (permalink) Old 09-23-2015, 02:48 PM
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How r u running ur catch can n did u change ur pcv system when running ur catch can u had to pull the manifold

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post #3 of 24 (permalink) Old 09-23-2015, 03:41 PM Thread Starter
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Originally Posted by 3.2s View Post
How r u running ur catch can n did u change ur pcv system when running ur catch can u had to pull the manifold


I'm sorry, I am not sure what u mean "how r u running ur catch can" , but I installed it exactly as the manufacturers instructions stated. instructions http://support.corksport.com/instruc...-6-889-WEB.pdf


Yes I pulled the manifold to install the catch can. Technically yes I did change the pcv system because as per instructions the intake manifold port was plugged off and the crankcase vent hose then went to the catch can. But it is still the stock PCV valve. I didn't change it when I rebuilt the motor. figured it was working before.


Also I suspect the pcv valve (stock orange 3s ver) because there is no oil in the catch can. only fuel.
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post #4 of 24 (permalink) Old 09-24-2015, 07:34 AM
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Hmm, CAnt u run a vented csn to remove some of that pressure, how much power are you running how much did it run u for a rebuild? I'm no by means any expert

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post #5 of 24 (permalink) Old 09-24-2015, 08:55 AM
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pinched OCC lines?

All I want to do is point a finger at the OCC, but that's just me. I've come across this thread three times now, and have nothing else to say, just want to say.... it's probably the OCC.

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post #6 of 24 (permalink) Old 09-25-2015, 09:59 PM Thread Starter
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Originally Posted by 3.2s View Post
Hmm, CAnt u run a vented csn to remove some of that pressure, how much power are you running how much did it run u for a rebuild? I'm no by means any expert

Unfortunately I live in the state of California so a vented OCC or vented anything is out of the question because of smog purposes.


Honestly not sure how much power the motor puts out. I rebuilt the motor because of a spun crankshaft journal. I had the block cleaned and checked. The cylinders walls were lightly scarred so I bored it .020 over. Then rebuilt it with forged H-beam rods, a forged ranger crankshaft and wiseco forged .020 pistons. Before I assembled it I had the rotating assembly balanced. Rebuild cost about 2000 I believe. cant find the receipts at the moment.
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post #7 of 24 (permalink) Old 09-25-2015, 10:03 PM Thread Starter
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Originally Posted by XCNuse View Post
pinched OCC lines?

All I want to do is point a finger at the OCC, but that's just me. I've come across this thread three times now, and have nothing else to say, just want to say.... it's probably the OCC.


I checked all the lines and none are pinched.


Yeah I think it has to do with the OCC also. Just cant figure out what. The only thing I can think of is a bad PCV valve.


I really don't want to remove it because from what I understand it keeps oil and other crap from going back into the intake and motor making it an oil mess inside.


I also don't understand why I have the problem. there seem to plenty of people running them with no problems
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post #8 of 24 (permalink) Old 09-26-2015, 12:42 PM
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What is with these forged ranger cranks? I'd say ur at the trial and error stage now bro

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post #9 of 24 (permalink) Old 09-26-2015, 04:58 PM Thread Starter
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Originally Posted by 3.2s View Post
What is with these forged ranger cranks? I'd say ur at the trial and error stage now bro


They are lighter and are forged instead of cast. They do not have the balance shaft gear on them. That's all that I know of from the forums.


I bought mine because it was cheaper to buy a new forged ranger crank ( I got for $200 on ebay) than to weld and regrind my stock crank.


Yeah I guess I am. seems no one here has come across that problem here.
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post #10 of 24 (permalink) Old 09-27-2015, 09:12 PM
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Yea idk man I really hope someone can help out I gotta look onto these cranks for when mine goes or same myself and get a rebuild

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