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Leaky Outdrive

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parker2520

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"Just put my boat in the water

"Just put my boat in the water today,Penta 5.7GSI with a DP-S drive, and noticed an oil film coming from the driveshaft area.The drive dipstick looks a little milky, but didn't seem to lose any oil.. During the off season,I pressure tested the drive and it was good(held pressure) I removed the props(boat is still in water) and a small leak seems to be coming from the driveshaft, but it's tough to tell. I'm hoping the oil slick is from the grease I put on the driveshaft splines but the slightly milky dipstick concerns me. Any thought would be greatly appreciated..."
 
"Chances are the oil slick is

"Chances are the oil slick is from the grease. If the oil looks milky, you may want to change it and monitor its condition for this coming season before starting to take things apart.

You may also want to check the condition of the dipstick seal, and ensure the dipstick is tight."
 
"Sorry to jump in on this thre

"Sorry to jump in on this thread, but I have some water in my 290 drive as well. I had the drive pressure tested and no leaks were found. Can water get in the oil through leaky bellows?"
 
"Yes, but if it did your u-joi

"Yes, but if it did your u-joints would be in bad shape and somehow I think you would have noticed.

In any case, you can loosen the large hose clamp on the drive bellows, then slide the bellows forward and see if there is water inside. If not, then you know that's not the source of the leak."
 
"Yeah, when I pulled the drive

"Yeah, when I pulled the drive off there was a little water in the bellows. I thought it was a sealed unit, so was not sure if that was the entry point. Thanks."
 
"I'd suggest draining the

"I'd suggest draining the oil so you can perform a pressure/vacuum leak down test, and for a reasonable time duration.

In addition to all O rings and seals, the shift mechanism seals are often over-looked on these drives. They can become a source of water intrusion."
 
"Thank you both for the replie

"Thank you both for the replies. Ricardo. I am trying to locate the seal(grommet?) you are referring to(where the shift cable enters) but can't locate it on the schematic. Was wondering if you could help with a part number. Also the drive was pressure and vacuum tested and held. Puzzling. If the seal is indeed the problem, is there a way to change out the drive gear oil without pulling the boat.. Thanks again...."
 
"Thanks again for the help. I

"Thanks again for the help. I ran it today and did't detect any oil slick. Oil level bout the same. I will run it tomorrow and see whats up and post then. Strange....
P.S. El, that link doesn't look familiar. Again, my drive is a DPS-1. Thanks"
 
"O.K. Now I see what you are r

"O.K. Now I see what you are referring to, I misunderstood.Going over this morning to take a look and looks like I'll have to pull the boat. I'll post my findings. Thanks for all the help. I'm sure I'll be back soon with more questions once the I look at the drive."
 
"Closer inspection of the ques

"Closer inspection of the questionable leaky drive reveals that the oil slick was caused by two things:
1. Apparently, some slick was coming from the driveshaft where grease had been applied.
2. Some slick was coming from the trim tilt piston rods. The trim cyclinders were rebuilt recently and apparently the oil on the piston rods was being " washed " when the rod was extended from the cylinder. Maybe the seals(o-rings) were not yet seated.As for the oil being slightly milky, I compared it to some gear oil I had left over and doesn't appear to be much different. I'll wait, run the boat for awhile and then send a sample of the oil out for analysis. But as of now, things look good...."
 
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