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View Full Version : Troubleshoot Water in Transmission


VOLFAN
04-09-2008, 11:56 PM
What are the reasons you have found or heard of to cause this?

How did you fix the problem?

bigmac
04-10-2008, 07:31 AM
What are the reasons you have found or heard of to cause this?

How did you fix the problem?

I think there are two primary ways that can happen...either deeper-than-normal water in the bilge being sucked in through the seals, or from failure of the transmission cooler core allowing water from the raw water pump output hose to be pumped in. Probably the latter situation is more common, especially in older boats. Replacing the transmission cooler is pretty straightforward. The dealer can get you one, or you can buy it from SkiDim.

http://www.skidim.com/products.asp?dept=1099

http://www.skidim.com/images/r147014.jpg

gigem75
04-10-2008, 09:52 AM
or the dipsitck seal can be defective and if the boat is neglected it can easily get in that way. Either way if you have water in your trans it will most likely have to come apart. You can change and change the fluid but getting it all out from behind the reverse plate is almost impossible without a tear down. It should be done asap to prevent corrosion.

you can test it by riggging up something like this

http://i50.photobucket.com/albums/f310/gigem75/pressure_test2.jpg

then look for leak down

http://i50.photobucket.com/albums/f310/gigem75/pressure_test2-1.jpg

Iman
04-10-2008, 10:58 AM
I've had that problem as long as I've owned my boat and we've never quite figured it out. Most likely water comes in thru the seals when water is in the bilge. I've really tried to keep water outta the bilge and had less problems. Hopefully your problem will be easy to fix. I've read where many are like mine, kinda a continual slight problem.

VOLFAN
04-11-2008, 11:51 AM
I think there are two primary ways that can happen...either deeper-than-normal water in the bilge being sucked in through the seals, or from failure of the transmission cooler core allowing water from the raw water pump output hose to be pumped in. Probably the latter situation is more common, especially in older boats. Replacing the transmission cooler is pretty straightforward. The dealer can get you one, or you can buy it from SkiDim.

http://www.skidim.com/products.asp?dept=1099

http://www.skidim.com/images/r147014.jpg


Where is the cooler located? I don;t think i have seen anything like that in the engine compartment. I see the lines coming off the water pump hoses and they go straight to the tranny.

I have drained and filled up the tranny with new oil once. After the first pumping I could still see some milky oil in the bottom that I could not get. So I guess that is why it will take a few times to get it all out. I plan on pumping it out and refilling it a couple to a few more tiems this Saturday. Hopefully I will be able to get it all out. Then maybe I will be able to find otu where it is coming from.

another question... When I in screw the dip stick for the tranny it seems to be under pressure. I can hear the tranny relief the pressure when it is un done. Is that a bad thing or the correct thing?

bigmac
04-11-2008, 01:02 PM
The transmission cooler is a heat exchanger. Oil from the transmission is pumped through the smaller lines on the side, in one fitting, through tubing that circles around inside, then out the other one and back to the transmission. In the meantime, raw water from the raw water pump goes through the big 1 1/4 inch fittings on the end on its way to the engine, thereby cooling the tubing and the transmission oil inside. If that oil tubing inside corrodes and leaks, the water out of the raw water pump, which is at higher pressure, gets into the transmission oil.

That transmission cooler setup has been used on inboards for many years...certainly you have one on your 2003. Start by looking at the two 1 1/4 inch hoses coming off of your raw water pump. One will be the intake coming from your through-hull intake, the other should go to the transmission cooler. You should see it if you trace the output hose from the raw water pump - it will be the first stop. Note that it's painted, not bare metal like in the picture.

You'll see some pictures of the arrangement in the 2004 and later owner's manuals, I don't know about your 2003 owner's manual. MasterCraft recommends pulling the lower hose off that transmission cooler regularly to check the strainer for weeds etc blocking it.

One reason your getting pressure in your transmission could be that you ARE pumping water from the raw water pump into the transmission. Not sayin' it is, just sayin'....