Merc 5.7 leak

[Onexl85]

This is a photo of the port side facing the rear, I believe that's called the flywheel cover. I don't this the oil is coming from that seal, but curious, is there oil behind that cover?

 

[Bondo]

I don't this the oil is coming from that seal, but curious, is there oil behind that cover?

Ayuh,.... Inside the flywheel houisin' is the motor's rear main crank seal, 'n a core plug blockin' off the cam's oil galley,....

So, Ya, it's a dry space behind the cover, but a couple of possible oil leak points too,....

 

[Onexl85]

Bondo! I was hoping you were gonna chime in!!!!!

I think it's all coming from the valve covers, judging from the dye in the oil I think it's just dripping down the seal.

 

[Onexl85]

Would oil leak from the intake manifold?

 

[Bt Doctur]

Would oil leak from the intake manifold? Only if the sealant on the front and rear of the manifold was missing or insufficiant.

 

[NHGuy]

It's pretty easy to create a valve cover oil leak back there, I did it. Try to get the valve cover gasket perfect and see if it still produces oil. The oil pressure sensor is back there too. If it's coming from the rear area around that flywheel cover it's a project to repair., so check the things that can be serviced more easily first.

 

[Bt Doctur]

If no one has worked on the motor suspect a valve cover gasket or a rotted cover. Other places are the dist gasket, and the oil pressure sender either on top of the motor or located just above the oil filter.If you have an electric fuel pump, there is a pressure switch located in the same area.

 

[Onexl85]

Just had the top end of the motor rebuilt. Went down this evening with a black light to see the dye. Coming from the front and the rear of the intake manifold and from both valve covers

 

[Bt Doctur]

Now that we have all the needed info, you will have to remove the intake manifold, clean the rtv off, wipe with alcohol .
Place a 3/8 ths bead of sealant on the front and rear of the block.
If its a vortec manifold ,use 4 guide bolts /rods in the 4 corners
install manifold and ONLY START THE BOLTS, do not compress the rtv , GO TO BED. COME BACK TOMORROY
Tighten bolts to spec and install the rest of the components, make sure the dist gasket is in place too.

 

[Onexl85]

This is making me sick, I hope the marina makes good on it. I'm 4 grand in the hole and the motor has leaks all over

 

[Bt Doctur]

might want to look for another marina/mechanic

 

[Onexl85]

They are a very respected marina on the river. I don't want this to turn ugly because the marina is 7 minutes from my house. Very frustrating! But the owner is an absolute gentleman, so I hope I have a snowballs chance in hell