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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 05-22-2016, 06:56 PM   #1
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Transmission breather tube

Has anyone driven for a long time without a breather tube in their M/T?

Anyone have a hack for replacing a missing one?
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Old 05-23-2016, 09:29 AM   #2
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Yes..just makes a mess...get a hose that matches and route it firward...
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Old 05-30-2016, 09:55 PM   #3
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Had my hose open vent zip tied up high to my battery cable lead i ran down the trans tunnel. I wouldn't run without it or with it blocked off. However the shifter isn't air tight i dont think so maybe blocking it off completely wont hurt anything. I've taken the 71c apart before for inspections and i dont see why it would't just simply vent excess pressure/heat through the shifter. Just my 2 cents.
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Old 05-31-2016, 12:06 AM   #4
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I can see a hot day and steep incline causing a leak along with dust and bugs getting in there. I was thinking of cutting some brake hardline that could fit in the port. Anybody able to measure the I.D. of the hole on a manual KA24de trans they have?

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Old 05-31-2016, 01:08 AM   #5
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I can measure the hose

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Old 10-22-2018, 08:57 PM   #6
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Hey sorry to revive a dead thread, but since we're on the subject of transmission vents, is there a way to test whether it's clogged? My M/T frequently lets out a loud hiss when I let off of the gas under load. I'm worried that it's clogged up.
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Old 10-25-2018, 02:30 AM   #7
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blow down the pipe.
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Old 10-25-2018, 02:47 AM   #8
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Quote:
Originally Posted by gaz_moose View Post
blow down the pipe.
Easy enough. Wasn't sure if i should blow or suck
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Old 10-25-2018, 03:03 PM   #9
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Easy enough. Wasn't sure if i should blow or suck
Do both and don't forget to spit
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Old 07-28-2020, 05:13 PM   #10
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Just wrapped this up. A new breather tube can be fashioned with 5/16 OD hardline. Welded a washer to it to bolt it to the engine at the top with the turndown. Made a slight fillet with hardline cutting tool. Hand press fit into the trans.

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