Leaking ATF near the flywheel - Toyota Sienna Forum - siennachat.com
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post #1 of 11 (permalink) Old 02-06-2017, 10:48 AM Thread Starter
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Leaking ATF near the flywheel

This 2005 Sienna AWD has 125K miles on it.

One day it started to quickly drip trans fluid.
I unbolted the little door covering the flywheel and made this video:

https://goo.gl/photos/qjd55tkoTPXbRQHD8

Called dealership, they said "Transmission Pump", but I can't find any info on that.

Has anyone had this before ?

Thanks,
Mark
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post #2 of 11 (permalink) Old 02-06-2017, 12:31 PM
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Re: Leaking ATF near the flywheel

Silly question, but are you sure that's ATF dripping? It looks black in the video - more like engine oil. I was thinking maybe it was a bad engine rear main seal.

If it is transmission, torque converter seal?

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #3 of 11 (permalink) Old 02-06-2017, 10:48 PM Thread Starter
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Re: Leaking ATF near the flywheel

Quote:
Originally Posted by fibber2 View Post
Silly question, but are you sure that's ATF dripping? It looks black in the video - more like engine oil. I was thinking maybe it was a bad engine rear main seal.

If it is transmission, torque converter seal?
It looks black, since it's been in there for 125K miles I am guessing. But, when I rub it on my finger, I see red tint. It also smells more the ATF that's on the dipstick. But, I could be wrong. Either way, Transmission has to come out to fix this, right ?
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post #4 of 11 (permalink) Old 02-07-2017, 07:26 AM
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Re: Leaking ATF near the flywheel

Unfortunately, I think you already know the answer on that one! I wonder if there's sufficient space to get a fiber optic scope up there to see the source prior to pulling it apart?

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #5 of 11 (permalink) Old 02-09-2017, 12:42 AM Thread Starter
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Re: Leaking ATF near the flywheel

Taking it to the shop tomorrow. I'll update the thread if I don't forget.
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post #6 of 11 (permalink) Old 02-09-2017, 10:00 AM
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Re: Leaking ATF near the flywheel

Please do!

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #7 of 11 (permalink) Old 02-09-2017, 11:33 AM
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Re: Leaking ATF near the flywheel

Before you spend any money at it, check that your transmission vent is not plugged.
I might sound like a broken record but these vents get neglected very often and road grime, rust and salt can eventually plug them. If they plug, you'll most likely get an oil/ATF leak. It happened to my on the rear differential on my AWD Sienna and also had the same issue on a used Mazda 6 I recently bought. The Mazda was leaking on the exact same point yours is.

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post #8 of 11 (permalink) Old 02-15-2017, 08:27 PM
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Re: Leaking ATF near the flywheel

BigKuma , kindly update. I might have the same issue.
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post #9 of 11 (permalink) Old 02-16-2017, 10:57 AM
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Re: Leaking ATF near the flywheel

I have a slow leak on the bottom of transmission pan. I always thought it was the transmission pan gasket. I've bought the gasket and plan to replace it, but couldn't take it off because the undercarriage/subframe got in the way. The location of leak is exactly like the photo you showed, except for your one is much faster. Please update your result.
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post #10 of 11 (permalink) Old 03-16-2017, 11:36 AM
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Re: Leaking ATF near the flywheel

OP, any resolution to this? Believe I have a similar leak.
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post #11 of 11 (permalink) Old 03-21-2017, 01:00 AM Thread Starter
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Re: Leaking ATF near the flywheel

So, it was a main transmission bearing. $3k. The shop guys took the car apart and were surprised to see it pulled out (or unscrewed?).
They said they've never seen something like that before. They thought that maybe I tow boats with the minivan or something.

What I suspect happened is this:

I park on a relatively steep drive way. My parking brake hasn't worked in a while. First I erased it because I was driving with it on, then when I tried to tighten it through the little access window in the hub, it would either always rub, or not hold the car on the driveway in neutral. So, I gave up and left it as is, allowing P to hold it in place.

Every time I drive up the driveway, I put it in Park, and let go of the brake pedal, I feel the car kind of sag back and slightly bump on whatever is holding it in place in the transmission. After a few years of that, plus the hard ski trip and trying to get out of a snow bank did the transmission seal/bearing in.
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