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-   -   Tranny oil leak (http://www.mastercraft.com/teamtalk/showthread.php?t=58219)

StrmChzr 11-21-2013 07:54 AM

Tranny oil leak
 
After winterizing my boat a couple weeks ago, I noticed oil was leaking out the forward bilge.

http://imageshack.us/a/img812/5308/z5al.jpg

I tracked the oil back to the zf hurth tranny.

http://imageshack.us/a/img585/766/1zau.jpg

The oil leak begins here slightly forward of the serial number:

http://imageshack.us/a/img194/5474/m7k5.jpg

Another view of the tranny and the tranny oil cap is off so I could check tranny oil level. It's low and seemed very thin, but didn't appear milky as if water had intruded:

http://imageshack.us/a/img546/2118/wu2v.jpg


What gives???

CantRepeat 11-21-2013 09:22 AM

Looks like a breather cap; did you happen to over fill the trans?

StrmChzr 11-24-2013 11:41 PM

http://imagizer.imageshack.us/v2/150...c/208/0nyt.jpg


Unfortunately, I did not have time to change any fluids prior to winterization. I'm positive the tranny oil wasn't in the bilge after pulling the boat out of the lake the last time this season prior to winterization. However, I did use my 4runner to pull boat/trailer the 15 miles from lake to my house and noticed the front trailer tires looked low, but pressure was 45psi. I figured the 4runner hitch was too low and wasn't distributing weight to tires appropriately.

Could something this "minor" make tranny fluid overflow? I attached pic to demonstrate how the boat was sitting in trailer when I winterized it. To my eye, it doesn't look to bad, but it was definitely bow heavy.

bsloop 11-25-2013 12:13 PM

Still hard to discern much from your pics.

It looks like new oil in bilge yet you comment on your transmission. Most ATF is red but the fluid appears clean yellow which is also counter to you not having changed the oil. I would expect it to be dark.

What are your fluid colors?
Have you checked the level of both?
Any chance you have a spare bottle of oil that has begun to leak?

StrmChzr 11-25-2013 03:01 PM

bsloop - Unfortunately, the pictures aren't much help at all. The ZF Hurth direct drives use ATF, but the manual states 4.5 quarts of 10W40 for V-drives and gear reduction transmissions.

Pretty confident the oil in bilge came from tranny, but hard to demonstrate with the sucky pics. When I checked the tranny oil it was low, however, I didn't check it the proper way. According to the manual, the boat needs to run for at least 5 minutes to get an accurate tranny fluid reading on dipstick and I didn't do this so it may actually be lower than the dipstick reads.

http://img854.imageshack.us/img854/4972/wsbb.jpg

mikeg205 11-25-2013 03:32 PM

Which ZF 63 do you have... this spec calls for ATF...

http://www.simplicity-marine.com/zf/zf63a/Technical.htm

bsloop 11-25-2013 03:34 PM

Interesting on the 10w40, not familiar with it but I am sure it has been discussed somewhere before. It would explain the "clean" oil.

From your pic of the vin tag and trans lines, I might happen a guess the crimp on a trans cooler line is leaking.

GM Allison trucks have a known issue with their lines leaking at the crimp (poor crimp design). They go fine for a couple years then as it starts to get cold, they begin weeping.
Temps warm and it may stop for a while but then as it gets colder, it leaks again.
Possibly a similar case?

Check the underside of the lines to see if they may be leaking further up and the drip is forming at that location?
Many threads on trans line and cooler replacements.

sand2snow22 11-25-2013 08:26 PM

Supposed to be in between the lines. Hopefully you just over filled it. After sucking, they usually take exact 3.5 quarts. I just overfilled my personal boat barely over the top line, this thread now makes me want to suck a bit out..

93Prostar190 11-25-2013 11:25 PM

I just tracked down a hard to find leak around a bolt that was backing out on my velvet 1:1

mikeg205 11-25-2013 11:31 PM

Quote:

Originally Posted by 93Prostar190 (Post 993824)
I just tracked down a hard to find leak around a bolt that was backing out on my velvet 1:1

Picture? which one?

93Prostar190 11-26-2013 10:50 PM

Quote:

Originally Posted by mikeg205 (Post 993825)
Picture? which one?

Mike, the bolt was on the driver side of the tranny, under the ECM mountings above the tranny.

It was really hard to find to find, I needed the dealers help because we traced all the usual suspects like seals and tranny cooler. I was lucky that I did not pull the tranny out of desperation .... I had some tranny fluid and smell for a summer in my bilge and it drove me nuts .....

Boat is covered in the garage but mAybe over the weekend, I will pull back the cover and snap a pic ...

mikeg205 11-26-2013 10:54 PM

thanks... would be a good pic to have

CantRepeat 11-27-2013 07:04 AM

Yeah, 15-45 wt oil is what my manual says. I just use the same oil that goes in the motor.

JayBrown 12-11-2013 11:30 AM

Quote:

Originally Posted by mikeg205 (Post 994089)
thanks... would be a good pic to have

X2 I had the same problem this summer I did tighten one of the tranny lines but would like to see where that bolt was. Not sure if I fixed it but ran good for the rest of the season.

StrmChzr 03-21-2014 03:54 PM

It's almost time to end my 05 XStar's winter hibernation in underground storage cave so I need to refocus on fixing the oil leak. One day after winterizing boat last fall, I noticed oil dripping onto my driveway from bilge drain that's located mid-keel. My winterization checklist didn't involve changing/adding oil to tranny or engine......

http://i521.photobucket.com/albums/w...image-1548.jpg

I traced the oil back towards the tranny. I removed the middle cushion from rear bench seat to expose the transmission area and took this pic. The green circle identifies the "bolt" that appeared to be leaking oil.

http://i521.photobucket.com/albums/w...a692dc0cd9.jpg

Here's a close up of leak....

http://i521.photobucket.com/albums/w...image-2323.jpg

Could this have occurred because the boat wasn't level while running engine during winterization?

http://i521.photobucket.com/albums/w...image-2404.jpg

93Prostar190 03-21-2014 04:00 PM

STRMCHZR,

great pics but I believe you are pointing to a venting cap / breather cap on your tranny .. usually if fluid leaks from there it is due to overfilling or a faulty cap.... are you sure it came from there?

Thanks ... maybe you just over-filled? (I did not go back and read whole thread in case you address that.)

Peace.

mikeg205 03-21-2014 04:00 PM

that is the breather valve... and that can leak of over filled or orientation of trans of kilter - the cap should float up and down.

StrmChzr 03-21-2014 11:41 PM

I'm pretty positive that's where the oil leak originated.... You can see the "oil slick" beneath the valve where oil was dripping into bilge

http://i521.photobucket.com/albums/w...image-1652.jpg

What do I need to do to fix the leak?

sand2snow22 03-22-2014 03:55 AM

That is the breather valve, is your tranny too full?

akbond007 07-06-2015 03:09 PM

Hey guys I know this is an old post, but I have a 95 ski brendella with a velvet direct drive. It started to slip gears on me very recently. I found out that when the velvet is low on fluid it will not properly engage the internal clutch. I was also concerned that the transmission fluid appeared to be regular motor oil. After some research I decided to go with ATF. A couple hours into running it it started to make what felt like grinding noises, when I pulled the cowling back it appeared that oil had been spraying from somewhere, and the ATF in the tranny appeared milky and low.what do you guys think the most likely culprit is? I know this is a long shot and I am sure I look like an idiot in more than one way, but my boat is down, and true help will be hugely appreciated.

osmonet 07-06-2015 07:15 PM

Quote:

Originally Posted by akbond007 (Post 1157956)
Hey guys I know this is an old post, but I have a 95 ski brendella with a velvet direct drive. It started to slip gears on me very recently. I found out that when the velvet is low on fluid it will not properly engage the internal clutch. I was also concerned that the transmission fluid appeared to be regular motor oil. After some research I decided to go with ATF. A couple hours into running it it started to make what felt like grinding noises, when I pulled the cowling back it appeared that oil had been spraying from somewhere, and the ATF in the tranny appeared milky and low.what do you guys think the most likely culprit is? I know this is a long shot and I am sure I look like an idiot in more than one way, but my boat is down, and true help will be hugely appreciated.

Did you check the condition of the heat exchanger? Also check the easy stuff for leaks, like fittings and hoses.


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