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Noticed today that I have some oil leaking from behind my prop. Have watched a few YouTube videos and think that I can do it. When ordering, what do I look for name wise? Will probably get them from Ebay. It's a 50 go Johnson 2 stroke 90's model. Also, if there are any tips to pass along I would appreciate it.
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If it has flow thru exhaust the oil you see could be from unburned oil that is coming out of the exhaust housing. Check your lower unit oil and see if it is milky looking. If it is not then don't worry about it. I would buy factory seals from a dealer. If it is for sure lower unit oil then you should replace the carrier seals and o rings
I drained the oil in the foot and I did get water out with oil. I was wondering why it would leak because I have never noticed it before, and it has been sitting there for a good two months.
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The second pic is a good one showing the black oil that I saw on the floor.
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Cant I replace the seals by leaving the lower foot attached and getting it out around the prop shaft?
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And I have no problem ordering from a dealer, especially if they help me replace it.
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If you have never done one before I would let a mechanic do it that way if it leaks it is in there ballpark. I am not that familiar with omc products so maybe someone else can help.
Remove the thrust washer in order to view the propshaft seal's condition. How long ago since the lower unit oil was changed?
I changed the oil in it last winter. How shouod I remove the thrust washer? I pulled on it with my hand and it is pretty stuck.
It's just stuck. Get under it with a wrench and pop it it up by means of leverage.
And you're calling the thrust washer that round part that the prop buts up against?
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yes
Gotcha. Will do that. Im also going to take an air tank and put some pressure in it and spray with soapy water to check it.
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If you do that with an air tank, you will most likely push the seals out of place.
How do you check them then?
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A well sealed lower will hold 12-15psi. Past that and even 'good' seals will leak. A sudden burst of high pressure will cause nothing but problems. I'm interested in knowing if the propshaft is wrapped with fishing line between the thrust washer and seal. If it is, there is a chance that the lower will seal back off with the removal of the fishing line. If the seals need replacing, I strongly urge you to take it to a repair shop. Also, If you changed the oil last year, the oil shouldn't be black. It may be that the oil is unburnt 2 stroke oil. Are you running premix?
I got some line off when I took the prop off, but not a lot. I have come to understand that the black oil I saw at first was oil that leaked out of the motor because I do mix oil with my gas. But, when I took off the drain plug, I saw milky substance come out along with oil and water.
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You may have two separate issues at play. Pop the thrust washer off and inspect the shaft for anymore line that might be under the seal. You should also be able to see a trail of oil tracking from the seal if it's leaking oil. Water entry into the lower may be from the propshaft seal being held open or damaged. Or it could be from a failing shift shaft o-ring on that particular lower unit.
Thank you! I appreciate all of your help. I am just going to take it to a shop and let them fix it so I know its done right. Sometimes trying to save a buck will cost you two down the road.
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I agree, take it to service shop!
Good decision to take it to a shop.
Got the call from the shop this morning. Said that he put 15 psi on it for an hour and it didnt leak. Said that it could have been condensation built up in it. They put new oil in it and it's ready to go. $75 and I'm happy anytime its under $100. Getting it Thursday morning and heading to somewhere on the Tennessee River to try my new poles out. I just hope my batteries have held there charge during last week's 2 degrees. Then hopefully Friday me and Trypman can get on some.
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Keep a periodic check on it through the year. It's likely the fishing line you removed from the propshaft allowed water past the seal. It's also remotely possible that one of the seals is weak in the other direction which would allow water passage as water pressure exceeds the lower units internal pressure. A vacuum test of the lower unit is used to test that. Also, if the pressure test was static with no movement of the driveshaft, propshaft or shift shaft, it's possible a defect was not found. In any event, should you find water during a check, consider this info. Good luck
He said that he rotated the prop while it was under pressure.Quote:
Originally Posted by sliderman