Oil everywhere

[Tlgtrans]

I changed the oil and filter in my mercruiser 5.7 today-ran it for about 20 min in the lake, oil pressure was about 70 at operating temp, 3500 rpm. All of a sudden, oil pressure went to zero, I shut that engine off, got back to the dock with other engine. Opened the engine compartment, oil everywhere. Filter still tight, I’m at a loss on this one. Any ideas?

 

[itsathepete]

Could be any number of things. Oil filter defective and leaking, oil filter o-ring bad, not tight enough, oil cooler line leak, oil drain plug leak. you will have to do some looking. hopefully you got it shut down in time to save the engine

 

[SternDriveEd]

When you removed the old oil filter did the gasket seal stay on the engine block? If so, there will be two stacked gaskets on the new filter once installed. This will quickly lead to a catastrophic oil loss.

 

[Tlgtrans]

Could be any number of things. Oil filter defective and leaking, oil filter o-ring bad, not tight enough, oil cooler line leak, oil drain plug leak. you will have to do some looking. hopefully you got it shut down in time to save the engine

I shut it down after about 5 seconds. Didn’t hear any clanging or weird noises. I checked the filter again, was tight. I’m going to wash the engine down and look around. Other engine ran fine. Never seen this before

 

[Tlgtrans]

When you removed the old oil filter did the gasket seal stay on the engine block? If so, there will be two stacked gaskets on the new filter once installed. This will quickly lead to a catastrophic oil loss.

I don’t think so-I wiped off the housing and didn’t see one but then again, wasn’t really paying attention. I checked for leaks after changing on idle, didn’t see any

 

[Davetowz]

Clean it up and run it . look and see where it is coming from. Then can fix.

 

[Lou C]

Do you have remote oil filter mounts? Hoses OK? These are really convenient but they can leak.

 

[Tlgtrans]

Clean it up and run it . look and see where it is coming from. Then can fix.

Yup-that’s what I’m going to do. I’m thinking it’s oil filter is bad

 

[Tlgtrans]

Do you have remote oil filter mounts? Hoses OK? These are really convenient but they can leak.

Yes it is. I’m going to look at that as well.

 

[Drcoffee]

Can I ask, Do you always see 70#? 70psi sounds high for oil pressure. 40# is what I see at 2500rpm. You may have blown a seal at that pressure. Consensus on google is 10psi for every 1000rpm

 

[Tlgtrans]

Can I ask, Do you always see 70#? 70psi sounds high for oil pressure. 40# is what I see at 2500rpm. You may have blown a seal at that pressure. Consensus on google is 10psi for every 1000rpm

Yes, it’s always been about that-on idle usually around 25 so I believe that might be a sending unit problem or a gauge problem.

 

[Drcoffee]

Check the oil filter. It might have collapsed, blocking oil flow.

 

[Scott Danforth]

Check the oil filter. It might have collapsed, blocking oil flow.

If the filter collapsed, the bypass check in the block would open and oil would bypass the filter

 

[Rick Stephens]

Drop the oil filter and make sure there aren't two o-rings on it.

 

[nola mike]

I changed the oil and filter in my mercruiser 5.7 today-ran it for about 20 min in the lake, oil pressure was about 70 at operating temp, 3500 rpm. All of a sudden, oil pressure went to zero, I shut that engine off, got back to the dock with other engine. Opened the engine compartment, oil everywhere. Filter still tight, I’m at a loss on this one. Any ideas?

Oil pressure senders can break and cause catastrophic oil loss. Ask me how I know...

 

[achris]

Oil pressure senders can break and cause catastrophic oil loss. Ask me how I know...

How do you know?

 

[tank1949]

I changed the oil and filter in my mercruiser 5.7 today-ran it for about 20 min in the lake, oil pressure was about 70 at operating temp, 3500 rpm. All of a sudden, oil pressure went to zero, I shut that engine off, got back to the dock with other engine. Opened the engine compartment, oil everywhere. Filter still tight, I’m at a loss on this one. Any ideas?

I bet you left old O ring on block. Or, blew Oil Pressure switch.

 

[nola mike]

How do you know?

I was talking to the op