oil leak from Merc 150

This topic has 8 replies, 4 voices, and was last updated 17 years, 9 months ago by EK.

Viewing 9 posts - 1 through 9 (of 9 total)

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September 1, 2008 at 2:08 pm #421496

catman2
Participant

I need help from some of you Merc. guys please. My “95 150 efi has developed an oil leak from the lower unit. It is not the lower unit lube rather the 2 cycle oil. The small tank on the engine is full but the remote tank lost approx.2 quarts. It started leaking in my garage several days after a tx. How can the oil drain from the tank through the motor and out the hub just sitting? When I removed the remote tank cap there was still a lot of pressure. Thanks in advance.

September 1, 2008 at 3:12 pm #421498

PhilAddison
Participant

You have a hose leak up there around the engine. Probably dry rotted and cracked and needs to be replaced. There are many small and larger hoses there and they probably all need to be replaced. The oil is running from the top down through the midsection and out the lower unit.

September 1, 2008 at 3:37 pm #421500

catman2
Participant

Ill be checking all the hoses shortly. There is no excessive oil in cowl. Is it possible to leak internally? Ill be back out there working on it after lunch.

September 1, 2008 at 4:04 pm #421502

Bass Cat Boats
Keymaster

Check the hoses close, I had one break a few years ago and never got an alarm, and we all know what happens when there is no oil in the gas!!!!!!!!!!! Cost me $1800 to get it fixed. Might be worth it to just change them all

September 1, 2008 at 4:20 pm #421504

Bass Cat Boats
Keymaster

Yes, on a 95 you should replace the bleed lines and oil lines once they show wear. It will cost many a powerhead not doing so.

September 1, 2008 at 4:54 pm #421506

catman2
Participant

Can I replace with any automotive fuel hoses or do they need to be the clear lines from Merc. Are the an odd size?

September 1, 2008 at 5:44 pm #421508

PhilAddison
Participant

Using a Mercury mechanic will take a lot of the guess work out on size and type.

September 1, 2008 at 9:13 pm #421510

catman2
Participant

Must be more to it than a leaking hose. Cleaned everything with brake cleaner. Checked all the hoses. Went to fire her up and would not start. Tried to once or twice but that was it. Plugs looked oil fouled. Looks like its off to the Merc tech. When i cleaned all the oil none of it ran through the hub, it all ran out from under the cowl.

September 2, 2008 at 12:46 pm #421512

EK
Participant

The reservoir in the boat should not have preesure on it after shut down. There is a check value in the block that lets pressure off after shut down. If you have pressure oil could bypassing the oil pump rear seal, which will fill the block with oil. Due to the age I would check everything related to the oil system.
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