Gray colored lower unit oil

[Captengine44]

I have a 90hp 1995 Mariner. When I checked the lower unit oil today it was silver colored. <br /> When I bought the boat last year the oil was thick and gray. I replaced it and checked it after a few times out and it was milky colored, so I had the seals replaced. When I changed the oil this spring it was it was ok(tea colored).I have a bad feeling about this. Any feedback would be appreicated.

 

[werdna]

Re: Gray colored lower unit oil

the LU drain plug should be magnetised. is there any small metal filings on it???

 

[The Marine Doctor]

Re: Gray colored lower unit oil

Pop the Brg carrier out of the gearcase and have a look inside.<br /><br />This will eliminate any guessing<br /><br />TMD

 

[BRIAN03]

Re: Gray colored lower unit oil

Water got in the lower unit and there is a bad or bad bearings.

 

[DJ]

Re: Gray colored lower unit oil

Captengine44,<br /><br />Lower units are pretty simple and tough. They can withstand a little water ingestion and not be hurt. The trick is to not let the water sit in the L/U for any length of time.<br /><br />The most common point of water intrusion is the fill/drain plug seals/gaskets. They should be replaced every time the plugsare removed for service. <br /><br />If you are storing your boat for the winter, drain and refill the L/U, replace the seals and check it next spring after your first run.