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I just helped a buddy change his lower gear oil and it was dark grey along with light brown. I told him that it means that some water seeped in through a faulty seal.

The engine is 1970s Johnson 9.9hp and I just wanted to get an estimate of the repair from some of the experienced members of the board before he takes it to his mechanic. I do not know how much it would cost and I do not want to see him get hosed.

How much should it be to replace the seals? The engine is running strong, otherwise.

Hi Mikail

The threaded plugs that you drain and fill gear lube through have gaskets on them I would replace them first and make sure the water is not getting in there before you go to a mechanic.I just had my lower end done on a 115 hp and it cost 350.00 I would think a 9.9 would be much less hopefully.

Russ

swampbuster wrote:Hi Mikail

The threaded plugs that you drain and fill gear lube through have gaskets on them I would replace them first and make sure the water is not getting in there before you go to a mechanic.I just had my lower end done on a 115 hp and it cost 350.00 I would think a 9.9 would be much less hopefully.

Russ

Wow, that does not sound cheap. I will tell him about the screw gaskets, although I do not imagine that he would be able to tell about more water for at least this season.

swampbuster wrote:Hi Mikail

The threaded plugs that you drain and fill gear lube through have gaskets on them I would replace them first and make sure the water is not getting in there before you go to a mechanic.I just had my lower end done on a 115 hp and it cost 350.00 I would think a 9.9 would be much less hopefully.

Russ

Wow, that does not sound cheap. I will tell him about the screw gaskets, although I do not imagine that he would be able to tell if more water seeped into the lower unit for a while. The oil does not look like it has been changed in a very long time, so I could have him run it a couple times and then recheck the gear oil colour.

It may be a good idea to have the gearcase pressure/vacuum tested. It would only take a few minutes at a reputable repair shop to check and could save a future overhaul.

Here's a simple question. Where would you go to get the gaskets (or o-rings) for the screws? Any place specific online or at any marine supply place?

Just go to any Johnson/Evinrude dealer they will have them very cheap make sure you tighten the plugs good and tight with a large screwdriver. Run the motor a few days then check the oil again, if it has gotten milky again I would take it to a mech. I gotta think it would be a lot cheaper than mine.

Hope this helps / Russ