Engine out...anyone know where this oil is coming from? Pics follow:

[H.G.P.]

The oil ends up on the bottom of the trans-engine housing mate here and drips out the bottom:



and I have what looks like oil flowing from the thermo here: and down through the upper left engine tranny stud here:






Could pics two and three (three on next below post) be causing the oil to end up at the bottom of the trans housing in pic #1 ?

Thanks for the help.[img]

[H.G.P.]

Pic #3 oil in and down upper engine-tranny stud:

[Colby]

I had a similar leak and fixed it this winter. The main output shaft seal on the motor behind the flywheel. It was leaking and causing leak out of that hole on the bottom of the bellhousing. I could tell by the fluid that it was motor, not tranny, oil. Yours also appears to be motor oil, so I'm guessing yours is the same leak as mine.

[jimz61]

The thermostat may very well be the culprit. The typical thermostat leak is a result of a failed "O" ring. Loosen the two 10mm nuts and carefully lift the thermostat out of the case. Check the "O" ring at the top of the thermo. If it is more than a few years old, it will most likely be hard, crushed out of round or cracked, and will not make a good seal. The leak makes a mess of everything on top and below.

[H.G.P.]

You mean the flywheel seal? I will take a look at it also.

[Rick Lee]

As long as you have it all apart, spend the $30-$40 and replace every rubber seal you can. Flywheel seal is a must. I put a tiny nick in my new one while installing it, tossed it and got another. This is no time to cut corners. You should replace your tranny main shaft seal and maybe guide tube o-ring too.

[jimz61]

Colby is correct. The main seal is the other suspect. I'd replace both the main seal and the thermo "O" ring while you've got the engine out.

[H.G.P.]

Originally posted by jimz61
The thermostat may very well be the culprit. The typical thermostat leak is a result of a failed "O" ring. Loosen the two 10mm nuts and carefully lift the thermostat out of the case. Check the "O" ring at the top of the thermo. If it is more than a few years old, it will most likely be hard, crushed out of round or cracked, and will not make a good seal. The leak makes a mess of everything on top and below.

Will do: I have a new green O-ring from what I understand is for the thermostat.

Thanks

[Early_S_Man]

HGP,

Thermostat leak would have a hard time making its' way into bellhousing ... so my vote goes to crank/flywheel seal -- it is only a few inches, and centered directly above where the pooling is happening!!!

[H.G.P.]

Originally posted by Early_S_Man
HGP,

Thermostat leak would have a hard time making its' way into bellhousing ... so my vote goes to crank/flywheel seal -- it is only a few inches, and centered directly above where the pooling is happening!!!

Flywheel seal came out broken in half! It was a new one too. Any clues to what went wrong? Is there a correct installation technique? Tried to follow projects 101 book. (See broken flywheel seal thread pic)

Thanks