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Oil in the water when engine running

  • jstefano
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6 months 1 week ago #7272 by jstefano
Oil in the water when engine running was created by jstefano
Hi guys

Every time I start my engine, there are oil bubbles behind my boat. It's no the green oil from the leg, as the reservoir is still full.
Mechanic said it maybe the oil cooler problem.
Any hint will be greatly appreciated, guys!

many thanks,


Jan
Vancouver, BC, Canada
Bayliner Classic 2452 (year 1995)
Mercruiser 5L, Alpha One

Jan
Vancouver, BC, Canada
Bayliner Classic 2452 (year 1995)
Mercruiser 5L, Alpha One

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  • Chief Alen
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6 months 1 week ago #7273 by Chief Alen
Replied by Chief Alen on topic Oil in the water when engine running
If your mechanic was correct the power steering cooler would be losing fluid.

If you are losing oil out the exhaust, your engine oil would be low every time you check it after a run on the water.

My question ... is your engine oil low ?

Is there water in your drive oil ?

Be good, be happy, for tomorrow is promised to no man !
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6 months 1 week ago - 6 months 1 week ago #7275 by David
Replied by David on topic Oil in the water when engine running
Hi Jan, have you done a compression check on the engine. It may possibly be oil leaking into the cylinders around the rings, valve stem or oil seals, when the engine is stopped and then being expelled through the exhaust at start up.

David
1990 Sunray Infinity
Twin 5.7 Cobra's
Last edit: 6 months 1 week ago by David.
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  • jstefano
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6 months 1 week ago #7276 by jstefano
Replied by jstefano on topic Oil in the water when engine running
Hey Chief,

well, I've noted oil in the water and since green oil reservoir was low, I had replaced impeller, re-sealed the leg replaced the gear lube.
But after all that maintenance, there is still oil in the water. Yes, engine oil was lower, I've added oil and ran the boat, but since I've added the oil when engine was cold, I am not sure if the measuring was accurate.
I will run the engine next time, check the oil level, then go out for a spin and check oil again.
Then I'll report back to this treat.

BTW, how can I tell if the gear lube has water in it?

Thank you very much, appreciate your help a lot!

Jan
Vancouver, BC, Canada
Bayliner Classic 2452 (year 1995)
Mercruiser 5L, Alpha One

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6 months 1 week ago #7277 by jstefano
Replied by jstefano on topic Oil in the water when engine running
Hi David

thank you for your reply!

RE: compression check on the engine

Nope, did not. Is that something I can do myself or do I need a mechanic to do this?
As well, how costly would be the fix in case the oil leaking into the cylinders around the rings, valve stem or oil seals,

Thank you very much, appreciate your help a lot!

Jan
Vancouver, BC, Canada
Bayliner Classic 2452 (year 1995)
Mercruiser 5L, Alpha One

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6 months 1 week ago #7279 by David
Replied by David on topic Oil in the water when engine running

jstefano wrote: Hi David

thank you for your reply!

RE: compression check on the engine

Nope, did not. Is that something I can do myself or do I need a mechanic to do this?
As well, how costly would be the fix in case the oil leaking into the cylinders around the rings, valve stem or oil seals,

Thank you very much, appreciate your help a lot!

Below is a video showing how to do a compression test. Does the engine smoke on startup ? What color is it ? As to cost it would depend on what is leaking and what the results of your compression test shows. Is there a lot of oil in the water ? Is it only there when you first startup ?

David
1990 Sunray Infinity
Twin 5.7 Cobra's

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