Transmission Oil Cooler

[CJM]

Okay, I have twin 7.4 horizons, with V-drives.. The last cruise I took, I noticed a sheen (oil or gas, not sure) coming from my Port exhaust in to the sea-water. I installed a new transmission cooler (changed the trans fluid), but I still see a sheen when starting the engine (and running at idle) in the marina.. Could this be residual trans oil that is still in the exhaust, or something else? I have not taken it out for a cruise yet because of this... Should I take it out for a cruise or diagnose something else? Any thoughts??

 

[CJM]

Also, the engine oil looks good. No decrease in pressure or quantity. Is it possible that it is gasoline? I've researched and see that there is a raw water cooled fuel cooler........ ?? The engine idles and runs fine, except for the sheen....

 

[dlvwill]

I would run it and see if it clears up, it's takes awhile to get an oil-fouled exhaust system to clean up, they don't get as hot as a car exhaust system, so they have to be "flushed" out as opposed to "burned" off....

 

[CJM]

I would run it and see if it clears up, it's takes awhile to get an oil-fouled exhaust system to clean up, they don't get as hot as a car exhaust system, so they have to be "flushed" out as opposed to "burned" off....

That was it.. I took the boat out for a nice cruise and the sheen has now gone away... Thanks