View Full Version : 1999 X Star, ATF leak

07-10-2013, 12:32 AM
Hey guys, I am mechanically inclined, but new to mastercraft & vdrive. I have put about 10 hours on my used boat (260 hours total), and the transmission seems to be leaking - possibly leaking to empty at this point since the dipstick seems dry, and there's at least a couple quarts of what looks like ATF in the bilge.

Can anyone walk me through finding the trouble area and repair/replacing the seals/damage?

I am willing to bring it to a marina, but feel I am capable of this repair, and trust myself more than others to work on it.

I winterized the boat this winter by removing the raw water intake hose from the water pump and connecting a hose from it to a bucket of RV anti-freeze. Did I miss a step and ruin the transmission cooler? I would like to target the issue first, then possible perform the maintenance myself.

Thanks in advance for your help!


07-10-2013, 06:39 PM
Usually V drives don't use ATF and they use more of a motor oil .... I am sure someone will chime in but as a DD guy I believe that is correct .... Maybe ATF is thin enough to be escaping your seals and vents? Check for a manual and make sure you have the correct stuff in your tranny. Good luck keep us posted.

07-10-2013, 06:47 PM
The transmission on that XStar can use either ATF or 15w-40 motor oil. My transmission had ATF in it when I bought it, and I swapped it for the heavier oil to help the low rpm rattle.

If it looks like ATF, I'd say it is. As far as leaking, I can't help ya there. I'd start by cleaning the bilge and trying to source the leak and move from there

07-10-2013, 06:57 PM
Clean the bilge and use paper towels or diapers , diapers with their sticky tape are easy to attach around the tranny in key spots and capture the leak in progress while underway.

Be careful and don't touch a diaper to something too hot but I bet you find the leak check the level as well since an over filled tranny will blow out ATF since it expands when hot.

07-10-2013, 06:58 PM
Check around the output shaft seals and the housing which attaches to the engine

07-10-2013, 09:11 PM

07-10-2013, 09:14 PM
oil cooler/lines looks good...

looks like a ton of ATF, but it's just a thin layer floating on the water... it is now drained.




07-10-2013, 09:15 PM
as albertasurfer said they originally were tranny fluid but switched to 15w40 for the tranny's. might see where the leak is coming from and switch over.